Comments 418

  • Do offer training, and how much?

  • Hi
    I want to install polished concrete on the ground floor of my new build. The builder has confirmed that the floor will be power floated and they use RC35. Is this something you can work with? I am based in the Tyne and Wear area.

    • Hello Kerry,

      Thanks for your question. That seems fine, we do recommend concrete with a RC35 strength and also a powerfloat finish, but the level of powerfloat finish will depend on which of our InfinityFloor finishes you are trying to replicate. Please either call or email and we’ll send you a specification for the look you are trying to achieve. Many thanks.

  • Hi, I’m thinking of grinding/polishing down a poured concrete slab with a flint aggregate sprinkled on the top after screeding and prior to bull float so it would be just below the surface. Should I be concerned about the hardness of the flint when it comes to grinding/polishing? I’m guessing I’d need to take off 3-4mm or so to reveal the colours. Do you have any other tips?! Thanks in advance!

    • Hi Matt,

      You would need to conduct a mohs hardness test to determine which bond of metal tooling is optimal for grinding down the surface. If the tools are matched correctly there shouldn’t be any problems grinding down flint seeded into the surface.

  • Can you concrete screed over an existing stone floor?

    • Hey Alison,

      With our PROtop and PROtop Loft concrete overlay products you can go over any existing tiled floor that is rigid and movement free. Please let us know if you need any further assistance. Thanks πŸ™‚

  • Does it matter if you use fine sand, or what sand is best recommended.


    • The use of fine sand will in theory make the concrete matrix weaker and more prone to shrinkage/cracking. Due to the cementitious paste having to cover a greater overall surface area of the sand. Coarse concrete sand is recommended.

  • hi with cream fin do you have to put a coat of cream seal or can I just take 2 mm of conc still have slurry on top no rocks showing and then clear seal and once u polish conc flat do I just roll cream seal and how many coats and let dry then clear seal or laquare

  • Greetings
    I am currently in the process of finishing a lean-to extension and the floor is at present covered in industrial foundation concrete.
    I would like a quotation for a polished concreted floor measuring 50 sgm which will become our future kitchen and sitting area. Also how long will take to do the job.
    I am based in south Manchester.

  • Hi
    I’m going to be getting concrete floors in my bungalow and underfloor heating. Am I able to polish the screed on top? If so does the screed have to be a specific mix?

    • Hi Andrea,

      Unforunately you can’t polish a standard sand:cement screed or an anhydrite screed, so you would either need to have a full concrete slab installed, or have a strong sand:cement screed laid and then a further micro topping such as CARRcrete PROtop or PROtop Loft

      If you should need any further assistance, please give us a call πŸ™‚

  • Hi

    Have you an email address to contact please?
    We are looking for floor preperation in Market Harborough

    Kind regards


  • Hello. I saw your comments on Tilersforum, esp about your diamond pads. I’m having a go at creating a concrete woodburner hearth – my first pre-cast concrete item. I’ve got a wet polisher (115mm). Which diamond pads would you recommend/have for this? Many thanks David.

  • Hi, can you lay the topcoat?

  • Hi, have wet underfloor heating under some very sound tiles (down 25 years). Can we put a micro topping over the top of these? Would imagine heat can still be conducted through a thin layer.


  • I have a 1950’s ground floor flat with concrete flooring and laminate laid over the top. I would like to rip up the laminate and have pushed concrete floors. Will I need to lay anything over the top of the existing concrete out can I sand/ polish that?

    • Hi Kirstin,

      It all depends on whether the substrate below the laminate is concrete or a sand:cement screed, if it a concrete substrate then yes you should be able to grind and polish. It all depends on how good the concrete is. If it is a sand:cement screed, then you will need to apply an overlay to this before it can be polished.

  • Hi, just had extension to kitchen and will be having underfloor heating can this be later on top of the heating elements?? If so how thick would it be? I do not want a step into the extension. I am currently having decorated and kitchen already fitted. Is it too late to have polished concrete floor laid? It is roughly 34 metres squared could you give me an estimate for this please.

  • Hi there, our builders installed a concrete floor with exposed aggregates but we had wanted a plain polished concrete finish (the typical grey floor) – they have said they can add a 0.5cm layer on top of that with the grey look, are there any problems with that approach? Does it mean it could be more prone to cracking further down the line? (And we have underfloor heating – do you think it will affect that in any way?) – How would that process differ from how you normally install a polished concrete floor, ie if they had installed it correctly from the start? (Does a normal polished concrete floor have any aggregates in it, hidden below the surface?) Sorry for all the questions, and thanks so much for any help you can give.

    • Hi Fay,

      There is always a chance that any solid substrate will crack, especially when over underfloor heating. With the new types of micro topping, as long as the product is correctly prepared, mixed and installed it should not crack. If it does crack, it is more than likely down to substrate beneath cracking/moving.

  • Hi, is it practical to polish an external concrete floor? Would it be slippery when wet?

    Many thanks


  • Hi, is it possible to power float a concrete floor if there is floor heating in the floor or will that damage the pipes?


  • Hi,
    We are starting our kitchen extension shortly and are looking into polished concrete floor. We will be installing UFH. Can you please confirm whether the concrete can be poured directly onto the UFH pipes instead of a sand & cement screed? Also what is the thickness required?
    Many thanks


    • Hi Josh,

      Yes concrete can be poured directly over the underfloor heating pipes, it is recommended that you use 100mm of quality concrete. If you send in an enquiry we can supply you with our concrete specification which you may find useful.

  • Thanks…i had overlooked that the finish troweling condenses the top of the slab…was trying to save on finishing as this is a 3000’sq foot building..I was ok with the grinding and polishing taking longer as I was doing that myself..i.e. Free labor! Do you recommend vibrating? I am using small aggregate and wanted a consistent look

    • You can vibrate, a lot of contractors tend to use a vibrating laser tamp and then thoroughly power float. Don’t forget to wet cure or cover with polyethylene sheeting to retain the moisture; makes for a more better slab.

  • I am placing a new floor that I will be polishing. Can we just screed and float the concrete during the pour? or do I need to trowel finish also? it is a large building and I am looking to reduce costs in the finishing phase. My though is…why trowle finish if I am going to grind that surface off anyway? Thanks!

    • Hi Bart,

      We would always recommend a floated preferably a power floated finish, this consolidates the surface and makes for a more dense, harder surface that will polish really well. It’s also more cost effective to grind.

  • Hi

    We are having an extension built to our kitchen. It is already a large kitchen but will effectively become a very big kitchen and living area. The existing kitchen is tiled over a concrete floor and has underfloor heating. The new area will also have underfloor heating. We like the idea of a polished concrete floor but am interested to know if it would be suitable to our requirements. I don’t really want to have to take up the existing concrete floor but neither do I want a visible join between the existing floor and the new extension. Any suggestions?

    • Hi Peter,

      You will always need to have a join between old/new substrates, otherwise it’ll crack through. Even with a complete new substrate you would be advised to have a joint where there is a doorway or change of direction in the floor to reduce the chances of cracking. The joint doesn’t need to be wide, just a diamond saw cut a few millimetres wide and can be filled with a sympathetic coloured flexible filler.

  • How slippery will a polished concrete floor be? i have two young children who never stop moving!!

    • Hi Nav,

      Polished concrete is inherently low slip compared with other premium flooring types. To further enhance the slip resistance we do apply a protective guard sealer that has a high slip resistance factor included.

  • Hello,

    I have a concrete slab floor in my kitchen and entrance. I would like to install insulation, water underfloor heating and a polished surface in place of the screed.

    What technique/material(s) would best suit the upper surface with the aim on minimising the overall thickness/depth?

    Thanks very much for your help.

  • Hello,

    Can you please help?

    We just laying our underfloor heating pipes in our extension, and need the screed to pour over it once the pipes are done. Can we polish the screed or is there something we need to do on top of the screed before we can have the polished concrete?

    We also thinking of using renovation screed on the over floor panels systems in the existing house? Can we polish the renovation screed and have it as a finished floor?

    Kind regards,

    • Hi Rebecca,

      Unfortunately you can’t grind and polish a standard sand:cement screed as it too weak. You can apply a concrete overlay topping such as our CARRcrete PROtop which will polish beautifully, you do however need to consider the curing/drying times required for screed which is approximately 1 day per 1mm of thickness. We also manufacture a high spec premium rapid hardening screed called CARRcrete PROscreed which can be covered with PROtop after 24 hours.

  • Are we able to have concrete in the kitchen diner and the same onto the patio? We are having bifolds to open up the corner of the room so would like to create a flow from inside to outside. Would it be polished inside but not out?

  • Hi we are doing a self build and yet to start we would like polished concrete on the ground floor with glass and underfloor heating what is the best way of creating the whole floor from foundation level as in to stop the concrete cracking thanks

    • Hi Lynsey,

      I would always bank on getting some cracks in a concrete floor as there are no guaranteed ways to completely prevent them. They can be minimised by ensuring water usage is kept to a minimum for a dryish mix. Movement and perimeter joints should be set and reinforcement mesh also helps. If you are going to use glass in the mix you will need to have your concrete modified to accept the glass otherwise you will get a damaging reaction between the glass and the alkalinity of the cement.

  • Hi Dave, do you polish existing concrete floors?

  • Hi I have a polished concrete floor what can I use to polish it up to make it shiney again?

  • Do you have a telephone number for Chelmsford area, do you visit local sites to give recommendation?

  • Hello,
    I am making a polished concrete worktop for myself. i have used a lithium based densifier and the results are good but although this has made the concrete resistant to most stains it is not resistant to oil. I was wondering if you could sell me some concrete sealer as the only available sealers i can find are from the USA. I am in the channel islands and cannot afford to have someone come over and make the worktop or have it made in the UK and have it shipped here. Besides that I fancy doing it myself! Kind regards, Davy.

  • Hi,
    Due to an unfortunate change in plan I have a floor construction of DPM, 100mm concrete slab, 100mm insulation,65mm anhydrous liquid screed with UFH pipes….. then the plan was to lay an engineered wood floor of max 25mm over, our heating engineer has now changed his mind and said this covering is not an option and some sort of mineral covering is essential… my client refuses to have tiles of any sort and would prefer powerfloated/poloshed concrete. Could you please advise if this is an option/ what your recommendation would be…… thankyou !

  • Hi,
    I have just bought a second floor commercial office and plan to turn it into a 2 bed flat.
    Under the carpet tiles are some rotten, sticky floor tiles that once painstakingly removed have exposed a solid concrete floor as I expected.
    I wondered if it is possible to polish this existing concrete as it is? It appears to be in good condition (apart from the old black adhesive from the tiles).
    Many thanks

  • Is it possible to have a concrete floor with power floated finish on top of a suspended timber floor with 42x220mm joists with 600 mm centres and 18mm tongue and groove top deck board. Apologies if this is a stupid question. I am an architecture student and struggling to find any precedents or similar details.

  • I built my home in 2013 and have stained concrete floors in the downstairs with exception of the two bedrooms. The floors were polyurethaned after staining.l The polyurethane has worn off and they are very dull. Is it possible that I can diamond polish them now instead of having to use a polyurethan or acrylic to get the shine back ? If so, do I have to strip what polyurethane is still there in areas that have been covered with furniture or inside a closet that has not worn off before diamond polishing ?

    • Hi Leeane,

      I would recommend removing the polyurethane coating in all affected places to allow any new sealer to adhere correctly.

      • Hi,
        We have just built a 25 square metre rear extension to our house. It has a concrete slab, on top of which we are putting insulation, underfloor heating and a 55mm wet screed. We have been told that screed is too soft to polish, so we were thinking we could put 10mm of self-levelling concrete on top and polish that. Is this possible?

        The concrete floor contractors we’ve contacted say they need to pour concrete to minimum depth of 75mm. We can’t do this because our floor needs to be level with frame of the sliding door and the floor outside.

        What do you suggest?

        Many thanks,

        ps. The screed is being poured on Monday, so it’s perhaps possible we could ask them to make it a harder mix that could be polished. Any advice is greatly appreciated!

  • Hello, we are searching for a floor for our newly build kitchen and I would like to ask you:
    What is the difference between
    1) natural power floated concrete floor and
    2) polished concrete floor

    Thank you very much for your help
    Kind regards

  • Hi,

    I am working through the following detail:
    Floor build-up 150mm floor insulation with 150mm rc concrete floor slab on top (to be polished).
    How do you incorporate the perimeter insulation (60mm), especially at door and large screen thresholds, so that the insulation is not seen? Usually this is cover over by the floor finish, i.e. tile, board or carpet.


  • Hi. Are you able to give any insight in the best way to finish a power floated floor in terms of buffing and sealing. I have a wonderful finish on our PF floor and want to keep as the final floor finish. It is in an area that had underfloor heating. I don’t want a wax finish but a sealed finish that might enhance the natural colouration of the concrete. And of course I’d like to buff before and after (if you know of a good buffing solution?)
    Thank you

  • Hi,

    I am going to have 65 mm of standard cement put down, how long do you think it will need to dry before you can lay your pro-top and polish.

    Thanks in advance.

  • Hello,

    I am converting an upstairs bedroom into a bathroom and would love to have a polished concrete floor (no wet room). Ideally i’d like to add electric underfloor heating. Would this combination work? It has pine floor boards which is not suitable now. Would 18mm plywood on top make it solid enough to support a concrete floor with underfloor heating? Luckily the floor of the bedroom is about 50mm lower than adjacent bedrooms, increasing height a bit is ok.
    regards, Jelmer

    • Hi Jelmer,

      A solid polished concrete floor wouldn’t work unfortunately, but we do have a trowel applied micro topping called PROskim which would work in this situation if the ply was boosted with some additional cement boards. It is applied in 2-3 coats at 1-2mm thick, highly flexible just more robust than microcement products currently out there.

  • Hello,

    Is 65mm of screed suitable to be polished and to have underfloor heating within its depth? Screed will be on top of 150 reinforced slab and 25mm of insulation.


  • Hi John,

    Great site, and good info. We are looking for a sealer for our concrete floor, we have tried one in a hidden area which seems to turn the concrete slightly brown, guessing this may be unavoidable but wondering if you have one you would be able to sell us?



  • Hi
    I’m not sure if my inquiry form came through.

    How far south do you work – Farnham, Surrey?

    We are drilling out our existing floors relaying the slab with water filled underfloor heating to an area of 70m2. The stud walls can be put in afterwards to enable you the largest area to polish initially and then i guess there may be some finer finishing once the internal work is completed. We are looking for a high gloss finish with large exposed aggregate. Building starting this autumn for 35 weeks. We may also be interested in extending the concrete outside but with a more Matt finish to surround 3 sides of the house. This is currently a horrible concrete slab patio over a large area.

    Please can you email an estimate if you would be able to work with us.

    Thank you


  • HI, I am in the process of having 80sqm of underfloor heating laid, and will of course be laying insulation and concrete on top. In order to then get you to polish the concrete once it’s in, what do I ask the builder to put down in terms of the concrete mix in order to get an attractive finish? Is bog standard concrete sufficient? Is there anything else I need to tell them about getting it very flat and level? . I live in Suffolk and would want a silvery grey satin finish. How long in advance do I need to get you booked in?

  • Hi we are in the process of building a coastal property and are considering polished concrete floors. We would like to continue the floor from the inside to the outside. The property is extremely exposed to sea spray, would the continual salt exposure damage the concrete?

  • Hi. Do you also polish walls rather than just floors? I’ve recently purchased an apartment which comes with bare (matt polished) concrete walls. However, there are some stains I’d like to remove and re-polish them to a matt finish.

  • Hi, how soon after having an agilia screed laid can I polish it?

  • Can a polished concrete floor be laid in a commercial kitchen & if so it would have to have a non slip final layer is this possible

  • im thinking of having a polished concrete drive ! I have the permission for my drop kerb, my surface area will be 6.3 m by 10 m we want a Victorian blue colour but more Matt than shiny is this possible ??

  • We had cream coloured micro top flooring laid 4 years ago and very soon after it began to bubble and crack, It now needs to be removed – can you tell us please, the easiest way of doing to ?

  • Hi, we have just bought a new house which has a concrete floor with insulation on too and then chipboard, can we still have a polished concrete floor on top of this? We would like it in our kitchen which has already had the kitchen units installed and the skirting has been pinned to allow us to floor beneath it. Will it be possible for us to have a polished concrete floor laid? Thanks, Sophie

  • Hi,

    We are planning a polished concrete floor with tumbled glass in our basement and extension, but our builder has never done this before. I understand we need to inform the concrete supplier that we intend to use glass aggregate, however we are uncertain if it is possible to add the glass after the concrete is poured so it is only in the top surface, which would keep the cost of the glass down, or if it needs to be throughout the concrete? Also, would you recommend power floating or is this redundant as you were going to polish the slab once it has cured which would remove the floated finish?

    Really useful web site BTW!



    • Also, our builder has not mentioned reinforcement in the slab and there is no mention of this in the architects detailed drawings, given that the intention is to have UFH is this a requirement? The buildup is 100mm blinded hardcore, DPM, 100mm insulation, DPM, 100mm concrete which will contain the UFH pipe work, which obviously everybody is aware of. If reinforcement is required for stability as I have read above is there a preference between steel mesh and fibres added to the concrete in terms of stability/cracking prevention?

    • Hi Gareth,

      You need to be careful when adding glass to concrete, ensure the mix supplied is suitable for such an addition otherwise there could be a reaction between the two. Seeding the glass into the surface is possible, ensure it is well worked into the surface, a gentle powerfloat would be good to consolidate the mass.

  • Early thoughts on polishing an existing concrete floor in a Nottingham garden centre.

    How non-slip is the finish in wet conditions?

  • Hello. I am having a concrete screed over underfloor heating which will be power floated. Am I able to polish a power floated floor at a later date? Also can I add material to the concrete screed to provide pattern. Thank you

    • Hi Rebecca,

      You can polish a correctly power floated floor without problem, if you would like a pattern in the floor then it is best not over power float as all you aggregates will be forced down by the action of the float. Also ensure it is concrete not a screed, concrete polishes, screeds do not.

  • Hello
    We are renovating a cottage with no insulation. Would the proboard be good enough insulation underneath the underfloor heating or can we put it on top of other insulation? We have 100mm total to play with so believe that 20mm proboard + underfloor heating + 35mm proscreed + 10mm (or more) pro top will give a hard wearing polished concrete effect floor. Where can I find the details on your proboard please.
    Thank you

    Read more:
    Follow us: @carrcreteuk on Twitter

    • Hi Barbara,

      It is recommended that our PROboards are placed onto of other insulation boards like celotex, kingpin etc for maximum efficiency. Here is a quick brief on our system for new build floors. The diagram does say 100mm minimum of celotex, but that is only to meet U values for new builds.

      • Sadly we cannot follow your system, as recommended, we only have 100mm in total. Can you see any reason why laying two (or more?) proboards on top of each other wouldn’t work? I’m assuming proboards will take staples for UFH?

        • Hi Barbara,

          You can use more than one PROboard or use thicker PROboards, we manufacture them up to 70mm in thickness. The minimum of 100mm of celotex or kingspan is to meet modern U value requirements in some new builds and to offer lower costs. We have installed floors which are a total of 100mm in thickness; 50mm PROboards, 40mm PROscreed, 10mm PROtop.

  • Hi

    How do I buy your products?
    Also ‘mix’ should i specify to my concrete supplier to ensure the floor is suitable for your team to polish?

    I am having trouble reaching you by phone….

  • Hi there. I am looking to install a polished floor in an existing home. The existing substrate is a 250 mm reinforced concrete floor slab, with an 85 mm build up of insulation between battens and timber floor. We are hoping to remove the build up above the slab, install a 25mm celotex board and underfloor heating on a clip rail system. We are hoping to install a screed on top to be polished. What is the minimum screed build up that we require please?

    • Hi Helena,

      Screeds normally do not work well at this thickness due to their lack of strength. We do however have a system in place where you put down your 25mm celotex boards first. Then install our reinforced PROboard insulation boards at 20mm thickness, install your ufh pipes to this, then we can install our 35mm PROscreed which is a flexible, reinforced advanced screed, then finally a 15mm overlay of PROtop which can be polished with or without stones (I hope that makes sense).

      If you should like more information on this system, please complete our enquiry form and Simone will email through an estimate and details.

  • Hi thanks for the info. PROtop or PROskim ?

  • Hi
    I have a house with bad tiles, if I chip them all out how thick do I need to make the concrete so i can polish it. Do I need to add any steel mesh or can I just pour on existing slab. Can I pour over existing tiles?

  • I am interested in using microcement in 3 bathrooms in my new build. Do you have a phone number? And where are you? No email or contact details on your website. Hello?

  • Hi
    I would be interested in getting some advice about a current project I have taken over from another contractor.
    There is a basement area which had an existing concrete floor which was very uneven and had been levelled with 90mm of fibre reinforced Lafarge Agilia before a Newton Tanking membrane had been applied to floor and walls. The client is interested in either a micro topped or polished concrete floor for this area which is 65 sqm. There is no restriction on height and the spec they have given me is 75mm insulation, underfloor heating with 90-100mm of Agilia self placing concrete. No mention of reinforcement. I am presuming that Agilia itself is not suitable for polishing and even if topped with a micro product it would still need suitable reinforcement to protect from cracking?
    I know Lafarge offer a reinforcement of metal fibres for Agilia would this be suitable or would mesh be required?
    From what i can determine it looks like a micro-topping is more suitable than a fully diamond polished concrete for a number of reasons.
    There is only a temporary transformer set up for power so no three phase (which is what i assume the machinery would run on) and access is very awkward to get machinery in.
    If CARRcrete were used does it still require large polishing machines or can it be finished with more portable ones?
    This is not really my area of expertise so any advice is appreciated before i start getting quotes in for the work etc.
    This project is a domestic town house but my client also has a number of office and commercial buildings and if this is successful is interested in using similar flooring in those too.
    Thanks in advance. Mark

    • Hi Mark,

      By using CARRcrete products you can use smaller machines to achieve a nice finish, three phase isn’t required. We have a preferred floor construction system that allows you to max out your floor insulation, then cover with our reinforced 20mm PROboard insulation boards, to which you install your underfloor heating, then we apply a 35mm layer of PROscreed, then either a 10mm or 15mm overlay of PROtop.

      This gives you a substantially more energy efficient floor that warms up more rapidly, less likely to crack and designed for polishing.

  • Hello.

    You have offered some useful advise above suggesting we use a CARRcrete PROtop overlay above the anhydrite screed, and I am awaiting a price for supply and application.
    I am concerned this may stretch our budget and wondered if you could suggest a budget alternative. We hope to achieve a smooth hardwearing and light coloured floor. Are there any floor paints you could recommend that could be easily applied? This seems to be common in commercial units.
    I would be very grateful for any practical advise you may have on painted floors, or any other budget approach to create a floor with the qualities described above.
    Thanks in advance.

  • I was looking to get a concrete screed in my kitchen polished.
    Is this possible? I believe it is a standard screed.


  • Hi. We have just bought a new flat (2nd flloor) which has concrete floors with carpet and laminate on top. Before moving in, we would like to rip up all the floor and polish the concrete… I have a few questions.

    1) Is it best to just grind and polish the concrete floor directly or lay a screed? And which is cheaper?
    2) Is it worth considering under-floor heating or will I most likely have enough warmth from the flats underneath?
    3) Is it as simple as grinding and polishing? Is it a DIY job? I have done wooden floorboards a number of times myself.
    4) is there anything else I should consider?

    Look forward to hearing from you!

  • Hi,
    I am thinking of having my patio done in polished concrete, we have recently been to Australia, where it is very popular in outside areas, but the weather here is very different!
    Would it work over here?

  • Hello.
    I am renovating a flat at first floor over a shop in an old stone walled building which I own. With a high vaulted ceiling and exposed stone walls I would really like to install a wet UFH system with a polished concrete floor. insulation between heavy timber joists exists, over which a Dpm and UFH will be installed. if the floor is structurally approved to take the load, do you foresee any other issues? The UFH company require a minimum of 45mm screed however i understand from above that a minimum 100mm screed or overlay is required? Your advice would be appreciated.

    • Hi Sebastian,

      That looks fine, Gypsol anhydrite would allow you to apply a 50mm screed with a CARRcrete PROtop overlay at either 10mm or 25-30mm.

      • Thank you that is very helpful.

        I have heard that liquid screeds can cause a slight deflection in the floor due to there initial weight when wet, which causes movement as the screed dries out and lightens. I am therefore concerned that this would cause significant cracks, and wonder whether a steel mesh reinforcement in the screed would be a good idea.

        Any further thoughts would be appreciated.

        • If the floors are rated for the application there shouldn’t be any deflection, the new gypsol screeds very rarely crack, less than concrete but there’s never a guarantee that they won’t crack as that’s one of the inherent features of concrete and/or screeds.

  • Hi. We are looking into having a polished concrete floor over 25m sq with wet ufh. We are having conflicting opinions of how thick the concrete slab should be. The ufh supplier recommend 80to 90mm thick concrete..but the concrete supplier has advised 100mm. Our intention is for dpm…insulation..ufh with reinforced mesh laid in the concrete. How does this sound.and would 100mm have any significant effect on the ufh?
    Thanks for your help!

  • Hello,

    We are thining of a polished concrete floor for our kitchen. Kitchen is approximately 4.2sq metres and we will be removing all units and fittings before we do the floor.

    Currently kitchen floor has tile finish, sitting on a screed of some kind which is covering the original floor which is either made of bricks or stone sets (have to do some more digging to check this out). If stone/brick original floor is left in place but tiles and screed removed we have a working depth of 22mm. Is that enough depth for a concrete floor? (we are not planning any underfloor heating). Thanks for your help.


  • We’re in the process of renovating our bathroom and would like to install a polished concrete floor, is this possible in a bathroom?

  • Hi, I have understand that polished concrete cracks, particularly with underfloor heating and as a result, there have to be ’tiles’ or ‘seams’ to allow for movement. However, if you wanted a seamless finish…then is there a way around that? I have heard of ‘flexiconcrete’ – which is part resin part concrete and as such has flexibility and movement so does not crack…does this actually work and do you work with it? Many thanks

    • Hi Jemma,

      We don’t work with anything resin. There is always a potential for any floor covering to crack, many view this in concrete floors as a feature. A possible way around this would be to install a gypsol liquid screed then apply a CARRcrete PROtop overlay both of which a very dimensionally stable and offer much higher crack resistance than any standard concrete or screed. Joints should always be placed.

  • Hi Can you have polished concrete on a floor with a slope at one end.

  • Hello,
    I am investigating flooring options for the end of our garden. We would like to install something ‘high end’ and love your product! But we would need to remove the slipping worry, so other then matt polishing and strategically line cutting is there anything else that could be done? eg something added tot he mix

  • Hi there, I’m a floorlayer/finisher myself and a friend has asked me to lay and finish there new kitchen floor over underfloor heating, I have done this many times but have never had to organise the concrete myself, what mix would you recommend as the least likely to crack under constant heating and cooling? I was thinking along the lines of a c40-45 straight opc, 20-25mm aggregate, 125mm thick, 193 mesh and a powder topping machined in for a uniform finish? Any input would be appreciated, many thanks

    • Hi Andrew,

      That’s actually a good mix design, the higher strength concretes use a lot less water which aids in reducing shrinkage cracking, you should be fine with what you have suggested. The key thing is commissioning the underfloor heating system correctly before using day to day. 1 deg up per day to the max you’re going to live with, 1 deg down per day, this allows the slab to expand and contract at a controlled rate.

  • Hi. This is the most informative site. Thank you. I have a question. We are digging up a tiled earth/dirt floor and replacing with type one, compaced earth etc with a view to laying a concrete floor as final finish under which there will also be DPM, insulation and underfloor heating infrastructure. I am concerned about cracking and movement in the finished base and wondered if it were better to first lay a slab the construct the DPM etc above it? We have limited ceiling height in an old cottage barely 5 ft 11 inches and we need to save as much height as we can.

    Also once a floor has been power floated can it be polished at a later day or is it better to polish to unfinished concrete.

    Thanks so much!

    • Hi Rebecca,

      There is always a chance concrete will crack, even if all precautions have been taken. Generally the thicker you lay the concrete with the lowest amount of water the less chance of cracks, the adding of reinforced mesh is certainly recommended. Perimeter and movement joints should be placed where necessary to induce cracks along pre-determined lines which are filled with a flexible filler.

  • Hi there, can you help with a polished concrete floor in London? Or recommend anyone there who could help? Thank you so much, Scarlett Stapleton

  • Is gloss finish a lot slipper than matt?
    Does one need to stick down an occasional rug (doublr sided tape) to stop them sliding or do they grip a gloos floor ok one you have applied your top treatment


    • Hi John,

      High gloss polished concrete floors correctly cleaned and sealed with our PROseal impregnating sealer offer superior slip resistance. IKEA have a backer for rugs which prevents them from slipping on smooth surfaces, alternatively there is a product on the market called Magicgrip which is an invisible anti-slip treatment.

  • Hello. I am considering a polished concrete floor in an open plan kitchen diner. The look, durability and ease of cleaning appeal, but I have two young children and have read about concerns over the hardness of concrete and kids. However, the alternative is porcelain tiles (obviously also very hard). Can you give me any advice? The kitchen diner joins up to a living area with original floor boards which we’d like to retain and think the contrast between old and new will look great. Also, I have read that a concrete floor should be waxed every 6 months. Is this correct and what does it involve? Thanks in advance for your help.

    • Hi Catherine,

      Concrete floors are very hard like granite or porcelain tiles and can be unforgiving. But a diamond ground and polished floor has superior slip resistance to tile and when correctly hardened and sealed with an impregnating sealer there isn’t a need to re-wax your floor every six months.

      The re-waxing relates to a product which isn’t actually polished concrete, it’s a power floated floor with a wax applied, producing a shine. Unfortunately these types of floors are sold as polished concrete when they are far from it.

  • We are looking to replace an old tiled floor in our kitchen. We are happy with the kitchen units etc. so is it possible to have a polished concrete floor with the kitchen in place.

  • Hi Dave, I have asked the question above regarding thickness of concrete floor. Could you also let me know, once polished, approx. how thick will the floor be? Thanks Julie

  • Hi Dave, we are in the process of renovating our home and are interested in polished concrete floors for the kitchen and dinning room. We would like underfloor heating, so once we have put down insulation and heating, how much room do you need to allow for a polished concrete floor? Thanks Julie

    • Hi Julie,

      You need 100mm of concrete over underfloor heating, any less than this and there’s a large chance you could get problems with cracking. Alternatively you could opt for a pourable screed which is around 45-50mm over UFH and apply a micro cement topping which is approximately 4-6mm thick.

  • Hi Dave, We are buying a 1960’s house which currently has bare concrete floors and a garage which we want to convert to living space which also has a bare concrete floor…we wish to have polished concrete floors throughout with underfloor heating, will we need to rip out the existing concrete floors to achieve this or can we we do this on top of the existing concrete? If the latter, how much will it raise the floor by?

  • Hello,
    I’m really hoping you might be able to help! We are in the process of having a house built in eastern Canada. The UFH pipes were installed, and two inches of concrete were poured over them. We added about 400 lbs of crushed glass (recycled, green, amber and some clear, largest pieces up to 20 mm in diametre). It was power trowelled. Saw cuts were made between doorways. The floor was then polished for a number of days. A number of cracks appeared, but I was prepared for those. My three primary concerns are as follows: several pieces of glass or aggregate popped out, leaving some holes in the concrete ranging in size from 10 – 20 mm in diametre; some of the saw cuts have chips out of the edges; and, there are what appear to be trowel marks in the floor, with some scrapes out of the floor, up to 100 mm. The trowel marks (if that’s what they are) are in arcs, some worse than others. Is there anything we can do about the holes in the polished concrete, these scrapes and/or the chips? The builder said if he polishes any more the floor could possibly look worse. So I’m hoping we can find something to add (grout?) to at least fill the holes, chips and swipes!! I so want to love our new floors — all 2000 square feet of them!!! Thanks very much.

    • Hi Gabriela,

      Two inches of concrete over heating is very thin, normally four inches would be the recommended thickness. That would explain some of the cracking you’ve experienced. The lose of glass maybe down to poor compaction or possibly and hopefully not something called ‘alkali silica reaction’ where the concrete is reacting to the glass and trying to eject them from the cement paste. Usually you need to have a special mix made to accept glass. If you see any spider web cracking on the surface that could be an indication of ASR.

      As for the trowel marks, you would need to diamond abrade these out and polish back up.

  • I have a customer that wants a polished concrete slab to stand a wood burning stove on. Can you please help?

  • Hi we have an anhydrite screed around 70mm thick with water fed underfloor heating. We have tiles on top of this but due to poor installation the tiles are lifting and cracking. Is it possible to remove the tiles and adhesive and polish the existing screed to our colour and finish preference?

    • Hi Michael,

      You wouldn’t be able to polish the actual anhydrite screed, it is too weak a surface. You could however apply our PROtop concrete micro topping or PROmicro micro cement product over the top, both of which can be applied at thicknesses less than a tile.

      • Hi thanks for the reply. Our cellar is finished so we have bathroom and kitchen fittings fully installed would this be a problem for adding a top coat? Also can we specify the colour and finish ie gloss or matt? And finally would this type of floor require regular maintenance like sealing etc? Thanks again.

        • Hi Michael,

          Fittings aren’t really a problem for applying the topping, polishing may be a little more awkward though. PROtop or PROmicro come as standard in grey or white, to which we have 30 pigment shades which can be mixed into the base product to achieve different shades. Yes you can select what level of gloss the product achieves, this is determine by how many diamond abrasive grades are used. Once fully sealed our products require less maintenance than a standard concrete floor but would still require regular cleaning and re-sealing if required.

  • We have had a concrete disaster. We poured too much in to our slab over ufh and it’s the final floor finish that we intended polishing. We are chipping away the excess but realise there is a great deal to remove. A scabbler we hired just would not take enough off and now it seems that the whole house looks not to be level!
    Any tips for removal of a lumpy floor to a level surface to polish?

  • I have a new build that I have a 50mm liquid screed specified over a 120mm insulation board with underfloor heating. Can you lay a 30mm polished surface over this. The area I have is approx. 100mΒ². The location is Blackwood, Gwent. Can you please provide me with this info and also a price.

    • Hi Martin,

      As long as the liquid screed is of adequate strength and is correctly prepared and with an RH of 75% or less before applying our PROtop is an ideal product. If you fill in our quotations form Simone will send through a quotation at her earliest opportunity.

  • We have a white polished concrete floor that was installed about 8 months ago which is now cracking – I’m guessing due to the UFH. Do you do repairs and if so, what would you use?

  • Can I have under floor heating with a polished concrete floor?

  • Hi,
    I have an old house with a concrete floor. It is ever so slightly uneven in places and different colours where different rooms meet and the previous owners have knocked through walls. It was never meant for show, it was meant to be covered with underlay and carpet. I would like the practicality of a polished concrete floor. Given the above colour variation and slight unevenness in places, is it possible to add a concrete screed top over the existing concrete to provide a consistent colouration throughout and have this polished? If so what would the cost per square meter be? Or does the whole thing need digging out and starting again, if so I think the cost would be prohibitive for me.
    Many thanks

  • Hi
    We’ve had a liquid screed floor put in and wanted to know what to use to polish this up. Please can you advise? Thanks.

  • I have a first floor flat where the floor construction is a solid concrete block (all one level throughout flat, no joins/breaks) but not in a good finished condition for painting (painted white is the finish I want). Do you know which type of screed/concrete would be best to pop on top to get a smooth finish to then paint? And also would it be worthwhile putting down electric UFH whilst at it? For comfort?? Only have about 20mm to play with up to bottom of doors (I have removed all the additional old floor coverings which used to reach the door level)

  • hi what type or mix of concrete do I need to cover ufh pipes I was told a 10mm stone content is this correct thanks trevor

  • Hi could I use my existing concrete that’s under my carpet as a surface, I hate carpet and wondered if I just took it up what I would have to do with the concrete that’s underneath to make it look good

  • Hi,
    We are interested in a polished concrete floor, however I have recently been told that it can crack and break up when used with UFH? Also I have spoken to a few people who seem to lay the concrete in different ways; some with reinforcing mesh and some with out? I gave them the same info on build up; concrete slab, 100mm cellotex and UFH pipe clipped to that. Could you please she’s some light on the situation?



    • Hi Harry,

      All concrete has to potential to crack, that is true. But there are measures that can be taken to minimise the chances of cracking, everything from reduced water content, concrete mix design, perimeter joints, movement joints, reinforced mesh and correct curing should be taken into account. We would always recommend at least 100mm of concrete laid over a UFH system to reduce cracking.

  • We have a polished concrete floor in our kitchen that was installed about 2 years ago by the previous owners. It seems to stain very easily, particularly if any greasy substances are dropped and not wiped up immediately. We wondered if re-sealing would fix this? And if there’s anything we can do about the stains?

    • Hi Nellie,

      Resealing once the floor has been thoroughly cleaned would definitely help. To remove the stains, you could try creating a poultice with fullers earth or clay powder mixed with some neutral cleaning chemicals. Mix into a paste and apply to the stained area, cover with cling film, pierce the cling film and allow the paste to dry. Repeat as necessary. **Always test in an out of sight place first.

  • Hi there, i am involved in a swimming pool project and due to cost cutting, have omitted resin flooring in favour of powerfloated concrete floor system (powerfloated as we are led to believe polished will not yield any saving). With that said, we now have floated conc in the main foyer & recepetion area which continues out into the external terrace. How would you recommend dealing with slip resistances with the intent of maintaining a consistent finish flowing both inside and out?

  • Hi. Our builder is about to lay a solid floor in our kitchen/diner extension, and I love the idea of having it polished. I think he mentioned screeding it. Is there anything I specifically need to ask the builder to do, to ensure that the base is ready for polishing?

  • Hi, any chance you would come to France to finish/ polish a concrete floor? About to have UHF laid with insulation and liquid concrete on a large barn conversion, main floor open plan…. Would love a polished concrete finish….? Thanks Jane

  • How long would it take to polish an area of 50 sq meters to a gloss finish

  • I have a power floated floor but it doesn’t look like I expected what needs to be done to get it polished


  • I’m looking to install polished concrete on the ground floor if our new build (72 squ m). I would like a gloss finish and probably a honey colour. What would you advise? We are on a tight budget. Thanks.

    • Hi Susan,

      If budgets are tight then a standard ready mix concrete which is professionally installed would be less expensive than using a premium concrete like our carrcrete proflow products. Diamond polishing costs are pretty much the same though, the colour largely comes from the sand.

  • I am making a toilet block in an old French stone barn, can I use polished concrete on the floor of the showers. Is it water resisitant?

  • Hi,
    We are looking to build our new kitchen out of concrete not just the worktops but the carcasses as well but the existing floor is timber joists and wooden floorboards. Would I be able to reinforce the existing wooden flooring to support the load ?? And would the slight movement in the floor mean cracks in the concrete ??
    Many thanks

  • Hi
    We have recently had our builders lay our concrete floor, my husband has undergone the task of grinding this to a level we are happy with. I’m now hoping for some advice on what sealer to use to get my polished concrete floor I dream of….Is an epoxy resin suitable? If not what would you suggest?

    Many thanks Clare

  • Hi

    We are about to embark on a kitchen extension about 10m * 5m with hot water underfloor heating.

    1. How thick a base do you recommend to lay underfloor heating on and then polished concrete on top (I can see 100mm is your recomendation for that – but would you recommend thicker if you can to ensure no cracking?) basically – what would the overall depth need to be as I am looking to have a flush finish with doors to the patio
    2. Does area 10m * 5 size need expansion joints
    3. What is the difference between stone resin and concrete in terms of instalation, maintenance and cost.
    4. What would be an appox cost for polished concrete in an area this size including laying / polishing?

    Many thanks,

  • We are having a concrete floor in our new extension and want a natural power floated floor finish, but wondered what we would then need to do to seal it / finish it so it isn’t porous or dusty?

  • We have an existing polished power floated concrete floor in a retail lift lobby which requires a durable long wearing heavy duty surface finish applied to the top surface. Can you advise on suitable surface finish treatments (floor paint will not be man enough)

  • I am completing an extension on a 1930s bungalow. The extension runs (open plan) into an original section of the house.
    We are intending to install wet UFH continuously through the adjoining old and new sections. The new area will have a concrete base which will be suitable for adding DPM, Insulation, UFH and then the concrete for polishing.
    My question is that the older portion of the house has a solum. The builder is installing battens between joists, adding the insulation and then intending to add 70mm dry mix screed over the pipework before laying flooring. Would it be feasible to add 100mm concrete directly (instead of the screed) to enable this to be polished or would this be too great a weight. We would ideally like to have polished concrete throughout.
    Thanks for any advice.

  • Hi there,

    We are planning an open plan extension that will span the back of our property (appx 7.5 x 3.5). The kitchen will be remaining in place (becoming a semi internal room) as will some of the existing structural walls between the kitchen and dining room and the new extension. We currently have ceramic tiles in the kitchen and what is currently the dining room – it may be concrete underneath these tiles. Ideally we would have a polished concrete floor throughout the two areas but would like to know how possible this would be?

    a) The kitchen is not being replaced, would the floor units need to be removed and then reinstalled?
    b) There will be some internal walls remaining – what issues do these create?

  • I have a basement floor to screed to a polish finish in grey . How do I do it?

  • While cleaning out our under sink cupboard we left the cleaning bottles on our polished concrete floor (!!) and the rings from the bottles are now impossible to remove. Is there anything we can do other than start again.

  • Hello
    Your website has answered most of my questions but I can’t find the info (may be there but I am missing it) to these:
    How do I get a sample of the types of finish (I want visible stones to reflect the Edwardian terazzo flooring in our hall (by the way know anyone who can repair this properly as it is in a real mess)) available?
    Also, I take it that the screed containing the stones then needs to be polished?
    I am saving money to get this done so will be approaching you for a quote shortly!!

  • Hello, I am thinking of having a polished concrete floor in a barn conversion. There is a concrete raft, 80 mm insulation, under floor heating and then space for 102mm screed which could be polished. Does this screed need fibres? I am worried that these could show after any polishing??

  • Hi, am in the process of doing a 40m square extension and would like a polished concrete floor. There will be UFH pipes sitting on top of 100mm celotex which would then have 70mm of screed on top but if I want a polished concrete floor do I lay the concrete instead of the screed, or on top of the screed? Or do you lay the screed and then lay a thin layer of cement mixed with glass and small stones which you then polish? Would you be interested in this job. It’s in the RH7 area?

  • We are in the process of renovating and extending. Please contact me to discuss/quote for approx. 45m square polished concrete floor.
    Best Regards, Gill

  • I have a small piece of granite/stone about the size of a house brick that needs polishing, is this something you can do?

  • Hi I am thinking of polished concrete floor 50mm on a raised access floor in our offices would it work ??



  • Hi. A neighbour has used poured concrete with a resin seal throughout his entire ground floor. The look is amazing and i love the seamless appearance. Could you please advise how much this would cost and what the maintenance of this would be?

  • We would like UFH for our new extension with a finished surface of your 30mm ground and polished floor, similar to the Old Cinema on “Grand Designs”. My question is … does it matter from your point of view whether the UFH is wet or electric ( Cable embedded in screed,not mat type)? The builder is dubious about electric as it would be so deep under the finished surface. I wondered if it simply means it takes longer to warm up/cool down and would actually be quite efficient due to the large thermal mass…we like the aggregateate visible in the 30mm type as opposed to the plainer 10mm option

  • Hi – I love the look of polished concrete but have been advised by our structural engineer that we only have 60mm for insulation, UFHeating and then the floor finish (ceilings are quite low on our 1980s house) and that this wouldn’t be enough for polished concrete. I am wondering if it is possible to buy really large scale polished concrete tiles or concrete effect tiles that would give me the look? Not sure this will cut it for me though as one of the things I love about polished concrete if that there is no grout. Any advice you can give would be really appreciated. Thanks

  • Hi!

    I have two app 200 sqm floors covered with a self levelling 80mm concrete screed which I would like to polish. However I’ve just been informed the mix has no aggregates in it – will the surface therefore polish at all?

    If I was to pour another layer containing aggregates on top of the existing screed, what would be the minimum thickness required and what mix would you recommend? I’m tight on room height so would need it to be minimal thickness. I would also prefer a non aggregated smooth look rather than visible aggregate – any recommendations?

    Many thanks!

  • Hello,I have a new concrete wet poor slab floor and would like it polishing and finishing, is this something you guys do?


  • Hi there,

    I really want a polished concrete finish for the floor in my bathroom. We’d still have a tray for the shower – here are my questions:

    – Is polished concrete suitable for having in the bathroom (not wet room, there will be a tray for the walk-in shower

    – Could I apply a polished concrete finish overlay on top of the shower tray, so as to create the impression of a jointless floor area.

    – Can a concrete worktop (for sink area …) be fixed to the wall directly rater than fitted onto a vanity unit

    I look forward to your thoughts!

  • hello there, I live in Costa Rica can I still ask a question?? We are a woman’s foundation recently got a colonial style house that has arabesque tile floor that have been painted and sealed with polyurethane, they don’t look good. Could we do a polished concrete or micro cement and cover this? Or would it be simpler to put tiles?

  • I think we’d like to test so we’ll be in touch a bit nearer the time. We could maybe collect a bag, as we visit family in Ravenshead from time to time..
    Thanks for now…

  • Is there any way of seeing a sample or samples “in the flesh” before we commit to a particular tone?

  • We’ve pretty much decided we would like the 30mm STONE overlay for our new extension being built later this year, but we’d like to choose a colour lighter in tone than on the “Grand Design” house in Thorne. How do we go about selecting one of the 40 tones mentioned on your website?

    • Hi Neil,

      Most of the colour seen in concrete comes from the sand in the mix, the pigmented colours we have available are for more exotic shades of red, brown, blue, yellow etc.

      You could create a lighter colour concrete by using a yellow or cream sand instead browns or reds (as used in the Thorne project)

  • Hi,
    We are building a new house near Perth in Scotland, do you work this far north?
    Also because the house is ‘upside down’ we would like to install the concrete floor on the upper level. The floor spec is, Knauf Brau 23mm dry screed boards over 20mm insulation panel with pre formed grooves and heat spreader plates on top of 18mm thick smart ply sub floor deck.
    Is this a workable system for your concrete Finish?



  • Hi
    I have Travertine tiles in my living room , is there any way to have a polished concrete floor without taking these up ?
    I am guessing they will have to be taken up is this a big job and would I have to do this or would you do it ?

  • Hi, I’m about to start building a house with an open plan hall, living, dining, kitchen. I’d like to have polished concrete for the whole downstairs (which will have wet ufh) but am a bit worried about price as I’m on a fairly tight budget. Do you work in Scotland? Also, the foundation will be a concrete slab which, I understand, will then have the ufh pipes laid on top. Is there then a 100mm concrete put on top of that or less concrete and your topper? Can I have a cream colour? Thanks.

    • Hi Maureen,

      Polished concrete is a premium floor finish and comparable to the cost of quality tiles and a professional tiler. It is important not to skimp on the concrete being used and we would always recommend to the use of our carrcrete product to ensure a better overall finish. Cream is possible.

  • Hi,

    Could you tell me which would be more cost efficient…..

    A) Installing a 100mm slab above underfloor heating and polishing to a matt finish

    B) installing a slab above underfloor heating (what would the minimum thickness be??) and then adding a micro layer on top?


  • Hello. I am having a new kitchen extension built which will have 120mm Kingspan insulation / wet underfloor heating pipes to be covered by 100mm of concrete for polishing. This will form a triangular area with dimensions approx 5m x 7m x 8.5m. Would this area of concrete slab require Rebar? Also, how much higher above the destination floor level should the concrete be poured to compensate for the polishing? Many thanks.

    • Hi Stephen,

      We always recommend taking a belt and braces approach to concrete flooring, and would advise rebar. As a standard we will grind away a maximum of 3mm off the surface. You could always use 75mm of pourable agilia screed and then 25mm of our carrcrete, that way you’ll end up with a far superior finish. As the agilia has aggregate in the mix you’ll still benefit from the inherent heat retention properties of concrete.

  • Hi I have recently moved in to a house 3yrs old and down stairs is all concrete I think! It is more of a sand colour would this be suitable? Or does it have to be a certain type of concrete!

  • Hi what finish would you think best for pets? We have a dog that goes bananas when someone goes to the door. As a consequence the wooden floor in the hall gets scratched. We are looking at a new build and wondered if you can achieve a polished concrete surface which would not show such scatches?

  • Hello,

    We will move into a fairly new house with water underfloor heathing and concrete on top very soon.
    We are aiming to have a [olished concrete before decorating and having the furniture in.
    How can we know how thick the layer of concrete is and if there are “expantion” joints ?

    Would you consider an inspection in Essex?

    Also, how long does it take for the polishing and the sealing of 60 m2 circa if the existing concrete is good enough? and how much will it cost per squar metre?

    Many thanks in advance for your answer


  • Hello. We have recently had 1 metre square polished concrete tiles delivered and are very surprised and disappointed they are significantly different widths which will make laying them very tricky: is this usual? Thanks in advance

  • WE are building a new extension with underfloor heating. We are specifying polished concrete finish and would like to extend this into the wet room. Is it a suitable flooring for a wet room? What if anything should we do to make it suitable ? For example should we have it coated with anti slip finish and if so is this easy to maintain?

  • Hello, do you make fire hearths, and what sort of cost would it be.

  • We are wanting to redo our tasting room for our winery. We have concrete floors in there already but unfortunately there are tiles set into the concrete making it very difficult to pull out. It was done this way so a forklift could drive over them without cracking. We now would like to have polished concrete. How thick would the concrete need to be layed over the tiles?

    • Hi Ashley,

      In order to get a decent key the tiles would either need to be removed or scoured so that the concrete would adhere, there are tools that could remove the tiles. Normally concrete would need to be 100mm thick but overlays for your application would be 30-40mm thick.

  • We have a new commercial property 2600 sqft, where the concrete has been already laid, we would like to get it polished, based in london. How much would it costs, an estimate ?

  • Ok, not sure where to go from here. When speaking with the underfloor heating company they felt that it shouldn’t be a problem as the panels were designed to be fixed directly to a concrete base floor, and the flexible levelling compound allows the pipework to expand with very little movement to flooring above.

    Is this something that you would be willing to look into further or do you know of anyone else I can contact to discuss further. We are keen on trying to get a polished concrete floor, but due to existing concrete base we are restricted with what we can do with the depth of our floor.

    Kind Regards

  • Hi, We currently have an un-insulated concrete base floor over which we are looking at laying XPS solid insulating floor panels which are stuck to the concrete floor using a Proflex SP tile adhesive to stop the panels from moving. The panels are pre grooved to allow the pipe work to fit flush into the panel and a 5mm flexible levelling compound is laid over top with the pipework under pressure, then tiles can be laid over top. Instead of the tiles would we be able to put a 30mm depth of polished concrete or would we still need a layer of screed then the polished concrete top?

    Kind Regards

  • Hi, could you tell me what is the difference in finished between a power floated floor and a ground and polished floor please? Do they both have a similar result and reflective qualities.



    • Hi Craig,

      They are really two very different processes and if done correctly very different looks in the flesh. Power floated floors are simply smoothed out with the float and sealed with a topical sealer which creates the gloss finish which is reflective but offers poor clarity. It is a cost efficient way to a form of polished concrete but the topical sealer does wear away and often quite slippery when wet.

      Ground and polished floors basically take a power floated floor and abrade the surface until there’s only the very finest of scratches, it is the uniformity of these fines scratches which reflects light, this can take up 10 sets of tools to achieve. The concrete is also hardened and sealed with an impregnating sealer to protect the floor. In essence it is a power floated floor on steroids, flatter, harder, more gloss and real clarity in the reflection.

  • I have a polished concrete floor and someone has spilt Red wine on it and I can not get it out HELP what can I do

    • Hi Jan,

      If the spill has been down a long time chances are its now too late to remove all of the stain. I would try creating a poultice with talcum powder and washing soda mixed with a little water to form a paste. Apply over the stain and cover with cling film, pierce the cling film a few times and tape the edges down. If you can leave this for at least a day to draw out the stain. Repeat as necessary. You may need to re-buff the area afterwards.

  • Hi, I’ve mostly finished a large renovation on my house and have done everything myself over the past 3 years and always planned to lay polished concrete myself, I have been planning it out for ages and am due to lay it in the next couple if weeks. If I used steel reinforcing mesh in the concrete, do you think 75mm is thick enough when running wet UFH in it? At this thickness I can fit 60mm PIR insulation and it’s on a block and beam base. Also what do you do and use for expansion joints? Your work looks amazing btw.

  • Can you accommodate this in your Carrcrete system? If so, would you pour this over the uft pipes as a 100mm screed?

    • Hi Mike,

      Our noSTONE overlays would need to be poured over a new or existing screed to a depth between 10mm-30mm. Please note that our noSTONE overlays do include small amounts aggregate up to 4mm in size which helps us provide a more robust surface. If absolutely no stones were allowed then you would be best using a micro-cement topping, which we don’t offer.

  • HI
    I am just starting a barn conversion and want highly polished concrete in the entrance lobby, kitchen, utility and downstairs bathroom.
    I have 2 questions:
    1) I want to have absolutely no aggregate visible; is this possible and, if so, can you direct me to a picture in your galleries of this finish?
    2) What do I instruct my contractor to do to ensure that the transition from the concrete floors to the adjoining wooden floors is completely level?
    Many thanks for your advice

  • Hi The substrate is solid and sound but the 60mm will include the depth for any insulation. The house is in Portugal

    • Hi Garry,

      In that case I would say no. Normally you would need 100mm of concrete or 60mm if our overlays were used. An alternative would be to have tiles made from concrete (which we have made) then grind and polish once laid. This way if there’s any movement it will follow the grout joints opposed to crack the whole floor.

  • Hi, my potential builder for our kitchen extension said he doubts a polished concrete floor can be applied over a wet underfloor heating system due to the expansion of the heating pipes. Are there considerations to take onboard? Looking to install 100mm insulation over solid floor, then floor heating pipes. Do you install the concrete floor? If not, what would you specify? Thanks

    • Hi Shaun,

      Concrete is laid over wet underfloor heating all the time, you just need to ensure it is good strong mix, well laid and at least 100mm. We don’t install standard concrete, what we would recommend is a pourable screed like LaFarge Agilia over the pipes at a thickness of 75mm, then our overlay applied over the top, that way you have the best possible finish.

  • Hi, I’ve been looking into having a polished concrete floor in my kitchen. A project that I wanted to do myself but having looked at how its done I fear its a tad too big of a project for me. At the moment we have what looks like melamine (?) floor tiles. One is completely loose and I can see that there is a black rubber surface underneath but I think there is concrete beneath as in other rooms the under flooring is concrete. Is it possible to turn this into a polished finish? And, this is my husband’s question, would it make the room very cold or is it not too bad (the latter being my hope!)

    Thanks in advance.

  • Hi David, I’m sorry that doesn’t mean anything to me! Could my floor be polished? and would you be interested in quoting for the work?

    • Hi there,

      Sorry if my answer didn’t make much sense. We really need to know what liquid screed you have, if it’s an agilia product (looks grey) then more than likely, if its a gvylon product (cream colour) then unfortunately not. Your installer should have the product name from when they ordered off the supplier.

  • HI
    I s it possible to polish liquid screed poured over an underfloor heating systems? Apparently the screed is …”a blend of Anhydrite Binder and selected aggregates mixed with clean potable water”….

    I smiled you last night regarding this project.


  • Hi there,
    We are renovating our house and are in the process of planning the downstairs space. We currently have a concrete floor overlaid with tiles but the tiles have to come up. I’ve just suggested to my husband that we consider polished concrete but he’s not convinced it will fit due to the thickness required. We aren’t installing underfloor heating. We have a large brick fireplace built on top of the existing concrete.
    Please could you tell me how deep the minimum thickness is that you would pour over the top of our existing concrete? I’ve seen previous questions about thickness but they all seem to be regarding underfloor heating.
    Many thanks
    Laura Andrew

  • Hi – it was Ideal Work. Apparently 3mm ontop of 75mm screed


  • Hi Please could you tell me approximately how much a square metre you charge to polish an existing concrete floor

  • Hi there, my name is Chris, I work for a maintenance firm on the wirral, we’ve been asked by a client to make a concrete worktop. Concrete has been poured and worktop is done however I’m having trouble finding any suitable sealants for the finish, do you have a product that be sufficient? or would you be able to suggest anything? thanks

  • Help! We’ve just had a microtopped floor installed, but already it has been damaged by heels. The contractor says to expect this – but I thought it is supposed to be more robust than that? Do you have any idea what might have gone wrong – and how we can fix it?


  • Hi, just wondering if you do any projects in Ireland? I am about to embark on a self build and really keen on polished concrete for floor in open plan living area, hall and maybe throughout the rest of the house but not sure where to start with questions!

  • Dear Sirs, we are about to start an extension to our existing garden flat. As part of that we will have a brand new kitchen (incl an island unit) and we were thinking to have polished concrete worktop. Do you make polished concrete worktops? How can I get a quote?
    We live in London.
    Many thank.
    Tiago FT

  • Hello,

    We are just in the design process for a new house and would like to specify polished concrete floors. We are having a beam & block floor with 150mm insulation and underfloor heating laid on top of the insulation. Would it be better to have 100mm thick concrete to provide a power float/ polished floor, or to have 75mm screed with a micro topping on top?

  • hi there we have an existing concrete floor however it needs leveling -is it possible to level and polish the whole floor. Also how long approximately would it need before to leave it before we could put a new kitchen on the floor. Cheers Lorna

  • Hi

    I have been asked to look into the possibility of having a polished concrete floor within a nightclub area, due to the nature of the business the flooring can become wet when drinks are spilt on it, can a anti slip process be included in the laying of these floors?

    • Hi Jonathan,

      As long as the slab was well laid onto a solid substrate and adequately reinforced there shouldn’t be any problems. Polished concrete is naturally low slip and even when wet, is no more slippery than comparative finishes such as porcelain or smooth resins. I believe there are reactive anti-slip coatings that can be applied but they’re not something we’ve ever need to apply.

  • Hi,

    We are thinking of creating a wet room style shower area in our bathroom, which will be on a raised platform to allow for drainage. Rather than use mosaic tiles for the flooring we would like to know if it would be feasible to use polished concrete instead. Please let me know if you think this would be possible.

    Many thanks

  • Hi
    Please can you tell me what the challenges might be of laying a polished concrete floor in an old house.
    We are considering it for a kitchen which at present has a mix of badly layed flags and quarry tiles ( I believe laid on concrete screed )
    and the floor is uneven.
    Any info would be appreciated.

  • We have a concrete slab flooring in our office currently covered in carpeted floor tiles (which are not stuck down). Would you polish this as is or do you have to lay something on top?

  • Hi – I’m thinking about getting a micro top concrete floor for my kitchen, but have heard that they can be damaged by stiletto heels. Is this true? I thought it would be more hard wearing than that? Thanks

  • Hi, I’m about to install a large steel balcony on the north aspect of a cottage. It will be exposed to the elements and being on the north side of a hill will be constantly in the shade. I’m considering a polished concrete floor with matt surface but concerned that it will require a lot of maintenance and be susceptible to algae. Can you advise please?

  • We are renovating a house which has a concrete floor under the carpet and tiles. We are opening up part of the house to create a kitchen living space and wondered if it would be possible to polish the existing concrete? We are near Warminster and also wondered the waiting time currently if we wanted to go ahead?

    • Hi Audrey,

      Yes you can polish the existing floor, but the quality of the finish is heavily dependant on the quality of the concrete itself. We have a few slots for the end of January and into February, but you would need to get booked in soon as our diary fills at a rapid rate.

  • Hi, I’m very interested in a polished floor but concerned the hardness may not be safe for my toddler or other babies to follow. Aside from rugs is there anything else you know of to help with safely for little ones on these floors?

  • Hi

    How do you fix the floor if, say, a hammer falls on it and breaks it?



  • Hi Dave,

    I really want a polished concrete worktop and upstands in my bathroom.

    Is this possible?

    Thanks, Emilie

  • Hi, we have a utility area that’s 11 m2 and has currently been finished with a self levelling screed. The utility area leads through to a self contained bedroom and wet room area used for my elderly father, we notice you recommend using the Matt finish to create better friction. Would this be reasonably slip resistant for his movement between rooms. We’ve submitted a quote request but would appreciate some info on it’s practicality in such circumstances. πŸ™‚

  • Hi,
    I would like to know is polished concrete flooring very slippy? I am particularly thinking about children in socked feet and our dog and for obvious reasons do not want it to be a hazard.
    Many thanks


  • We are renovating a house in the Peak District. We have already put down concrete base, insulation, ufh pipes and screed will go on next week.

    In the entrance hall, boot room, utility, cloakroom and vestibule we had wanted polished concrete but builders advised no. In the new year our current plan is to tile with 15mm limestone tiles. Having watched (too many?) Grand Designs we still are fond of polished concrete. I haven’t bought the tiles yet. My question is that, given the dimensions:

    1. Would PC work with UFH as described? and
    2. Can you do anything with 15mm or thereabouts?

    Many thanks for an informative website.

  • Hi I sent you a message regarding a site visit in Mansfield but not yet hard anything

  • Hi Can lime screed over UFH pipes be polished?

  • ok i will send you the measurements, and then could you please advice us what to do next or can you come and see us at the house in mansfield.

  • We are restoring a bungalow in Gloucestershire and have fitted hot water underfloor heating pipes on to 75mm insulation which has been covered with 65mm of sand/cement screed reinforced with fibres. Is it possible to lay a polished concrete topping on this? We could probably afford to go to 15mm, possibly 20mm without being too high.

  • Hi

    I’ve tried contacting you many times by leaving a voicemail but I don’t seem to be getting anywhere. I’m having my house built in Mansfield, which is now ready for the next step which is the flooring. Because its a large house we are having under floor heating which I’m hoping is suitable for a polished concrete floor. l’ve seen quite a few pictures of your work and i’m really interested in having a polished concrete floor so could you please get in touch with me asap otherwise I will have look elsewhere.:(
    Thank you bally

    • Hello Bally,

      We currently receive over a 100 enquiries per day, it’s physically not possible to call all of these back and still carry out our work each day. This is why we politely ask that all enquiries go through the enquiry form. It takes seconds to complete and tells us exactly what we need to know, to give you the answers you need.

  • Hi,
    I am just in the process of decorating, will there be much dust when laying a polished floor?

  • it is possible to have a polished concrete hearth for use with a woodburning stove ?? If so, is it something that you are able to undertake ??

  • We’re interested in a polished concrete floor for a new extension some time next year…Do you have a showroom or somewhere we could see some examples of different colours, types etc ?

  • Will snow and rain damage high polished cement

  • Will high polished cement outside be damaged by rain and snow

  • Hi,

    I have built a house in Doncaster that is 90% complete but we’re unsure with what to finish the downstairs floor. we’ve looked in to karndean, timber etc but like the look of the polished concrete. there is aprox 110m inside but would like to carry it on outside to the patio where there is aprox 45m, is it suitable for outdoors? Is it a really messy process as the property is already decorated?
    I have underfloor heating with a 60mm gyvlon screed could you give me a rough idea how much per meter please.

    Many thanks

  • Thanks for answer on expansion joints. We are going for power floated concrete floor across four rooms over insulation and ufloor heating. 80mm deep in 3 rooms and 100mm deep in dining room. Dry shake colours. I will place some expanaion joints in the doorways now. What shall I fill with… ?

  • Hi,

    We are just about to embark on a self build project and wanted to ask the following question. Given that the underfloor heating is installed under the concrete, is it easier if the slab is laid down first and finished, before the builders start building up the inner walls. I assume it means you can polish the slab much more quickly?

    I assume that we would have the slab laid and then you would just come and polish?



    • Hi Justin,

      It is much easier for us if we have no internal walls or a reduced amount of internal walls. This allows us to get most of the edges with our larger machines rather than having to resort to hand edging. Please note that concrete requires 28 days between pouring and polishing.

  • I have 4 rooms with ufloor heating – kitchen 6.1×6.4, 3.7×6.4, 3.1×3.2, 3.1×1.8. besides around the perimeter of each room, how do you decide where to place expansion joints, if needed in these rooms ?

  • Hi – Could you please let me know the minimum finished thickness when laid over insulation and underfloor heating.

  • Can a concrete floor be installed on top of a wooden floor & would this affect the cost?

  • We have a house built in the 80’s. It has polystyrene covered with chipboard for the floors. We have just had a new kitchen installed and the tiles we bought cannot be laid as not a firm surface. How much and how difficult at this stage is it to have a polished concrete floor?

  • I have a concrete base with under floor electric heating below tiles. Poor tiling has meant that I have a number of tiles that are broken and the thought of trying to take up a dozen random tiles and replacing them successfully is daunting. Is it possible to rip up all the tiles and replace with concrete (10-15mm), leaving the heating in place. Would the thin layer (skim?) be strong enough and be ok with the heating?

    • Hi there,

      Yes it is possible to put a thin micro-topping of around 10-15mm over the under floor heating. But there is a high chance the cables will be damaged when removing the tiles. Alternatively if you could make do without the heating, we could grind and polish the concrete floor this would be the least expensive option.

  • Hi there, loving the idea of polished concrete, we’ve completed the flooring in our home and fans of natural stone granite etc, however we are getting our drive and patio area re done and would love to use the polished concrete but is it suitable for these purposes, worrying about slipping staining and durability, I know it’s extremely hard wearing but would it be ok for a drive???? Thanks Vicky

    • Hi Vicky,

      Yes you can use polished concrete outside, but I would recommend keeping the polishing process restricted to a matt finish to ensure there is maximum slip resistance. You could also cut some friction lines into the surface at predetermined distances to increase grip further still. Our sealers work very well at resisting stains, but like any natural stone, correct care and maintenance is thoroughly recommended.

  • Hi we are in the process of having a new house built. We like the idea of a polish concrete ground floor. What is the cost compared to a tiled floor? Thanks. Simon

    • Hi Simon,

      Polished concrete is of comparable price to a quality tile and a professional tile fixer and is a premium floor finish. The concrete slab replaces the sand and cement screed that tiles are normally fixed to and can be applied over under floor heating. And with our unique sealing products a polished concrete is suitable for a vast array of applications.

      The benefits of polished concrete over tiles are

      1. Low maintenance
      2. No grout to clean
      3. Looks better with age if maintained correctly
      4. If tastes change, the look of the floor can be altered
      5. No problems associated with poor tile fixing
      6. Better green credentials

      Please do not hesitate to ask more questions, we are here to help.


    • Hi Sarah,

      Yes most definitely, we do this all the time. It is important to ensure the concrete is of the correct thickness and that movement and perimeter joints are placed as required.

    • Hi, is 60mm enough depth to have electric underfloor heating as well as polished concrete?

      • Hi Garry,

        It largely depends on how solid the substrate is as any deflection or movement beneath the concrete will induce cracking. Are you using any insulation and if so, what type and how is it fixed in place?

        • We have not poured the concrete yet. It is a for a 110m square basement. The floor was to be 150mm concrete, 85mm insulation, lathe ref tanking 65mm screed. We hope to change this to dpm, 85mm insulation and 150 concrete with reinforcement mesh and polish (no screed saving room height). We are on chalk and the basement area is currently open (no floor/house above yet) we will tank, stud and board walls after polishing concrete so corners not an issue? Our contractor is used to power floating and we are thinking of pouring normal concrete (as he would usually use) and then power float and then polish. Do we need to power float the day of the pour? How long do we have to leave the concrete before we can polish it? What is the longest it can be left before polishing? Is it just as easy/same cost to polish once the floors/house are above the basement? It will be a dark area ref natural daylight so a lighter grey mirror effect might make sense – is it just the lighter sand to lighten the pour or is white cement an option too? We were not going to bother with ufh due to the expense and that being at ground level we though the floor might be quite warm (thermal properties of the earth and insulation below concrete etc – is this so?

          • Hi Colin,

            Powerfloating is usually done a few hours after installation as the product begins to firm up. Diamond polishing is normally done around 28 days after instalation. You can leave the slab for as long as you want before polishing, time isn’t an issue.

            There may be cost implications when the build is more progressed.

    • We are considering a polished concrete floor in a basement that has recently flooded. The plan is to strip the basement back to the bare bricks and subfloor, tank the basement throughout with a membrane across the floor and up the walls, re-lay existing underfloor heating pipes back on top of membrane, then apply concrete on top of underfloor heating pipes. Can this be done?

    • Hi, what’s the minimum cover on reinforcement to achieve a powerfloat finish with a tolerance of 3mm over 3m? It would be standard 20mm aggregate concrete.

    • Does your system work on reclaimed quarry tiled floors?

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