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Discuss 200sqm floor, prep discussion in the Tiling Forum area at TilersForums.co.uk.

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  1. Doozy

    Doozy Active Member

    Got a site meeting next week where the installation of a 200sqm floor will be discussed.

    There are a handful of smaller rooms involved on the periphery, but the main area is basically T shaped. The bottom of the T is the entrance hall at around 26sqm, which opens up on the top line of the T as a rectangular room of around 80sqm.

    This is a sand and cement screeded floor over water piped UFH.

    The builder says no expansion joints are required and the screeder says no decoupling is required either.

    I obviously have my own thoughts on the matter, but I wondered what the consensus was on here
     
  2. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Ask the builder and the screede if they will put it right if it goes wrong if you do it their way . Me I would decouple and expansion joints
     
    • Agree Agree x 3
    • Like Like x 1
  3. Andy Allen

    Andy Allen Metro specialist & forum entertainer! Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Gloucester
    What tiles are they using....??
     
  4. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Decouple, expansion every 8mts i think ? My thoughts on expansion if their not in the substrate already do they work ??
     
    • Agree Agree x 1
  5. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Tiled Limestone floor in Virginia Water longest run over 30 mts no expansion joints. Customer didn't want them no probs after 5yr app
     
  6. Doozy

    Doozy Active Member

    Tiles are 900 square Andy
     
  7. Ajax123

    Ajax123 Tilers Forums Pro - Screed Advisor Trusted Advisor Professional Tiler

    Location:
    Lincolnshire
    Cant see what it has got to do with the screeder as to whether decoupling is needed or not.
     
    • Like Like x 2
  8. Alex Reed

    Alex Reed Active Member

    Location:
    Cambridge
    Got very similar sized floor to do in 3 weeks over a flowscreed (anhydrite). 800x800 porcelain. Using anhyfix to tile. Is a decoupler required? And hard or soft expansion joints and where? Am going to see it this week but would imagine there is no expansion joints in the screed. Any information/advice greatly appreciated.
     
  9. Benn Simmonds

    Benn Simmonds Active Member

    Location:
    Surrey
    If your using anhyfix by tile master And you want to decouple. Use anhyfix to lay anti fracture matting. Then use setaflex on matting. Cheaper way of doing it.
     
  10. Alex Reed

    Alex Reed Active Member

    Location:
    Cambridge
    Thanks. Is a decoupler required? We use them with natural stone but from researching am led to believe with porcelain and a flow screed it isn't necessary.....?
     
  11. Benn Simmonds

    Benn Simmonds Active Member

    Location:
    Surrey
    It' not really necessary but it' belt and braces. If you think you should use it then do. It will cost you more if the floor fails.
    Personally I would Matt it and tile it.
     
  12. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    If you look at the difference in expansion between porcelain and anhydrate there is a difference. Not sure what it is but their is and over a large area it matters because it adds up . So I would very much decouple
     
    • Like Like x 1
  13. Chris Gibbs

    Chris Gibbs Professional Tiler

    Location:
    North wales
    I would use an anti fracture mat. Anhydrite floor isn't prone to big movement but when heating goes on underneath you cant be too careful. it also gives the customer confidence in your methods too knowing you're covering all bases.
     
  14. Chris Gibbs

    Chris Gibbs Professional Tiler

    Location:
    North wales
    on an Anhydrite floor

    IMG_2077.JPG IMG_2083.JPG
     
    • Like Like x 4
    • Agree Agree x 1
  15. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    I believe from figures quoted by @Ajax123@Ajax123 on a previous thread unless I misunderstood that the porcelain expands more than the anhydrate
     
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