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Discuss Anydrite Screed / wetroom questions in the Tanking and Wetrooms Forum area at TilersForums.co.uk.

  1. Julian Power

    Julian Power Guildford Contracts

    Location:
    Guildford
    Hi, I would appreciate any thoughts on a few diverse questions on a singly storey barn project we are doing.
    - I haven't used anhydrite liquid screed before. I understand it needs roughing up 5 days or so after laying to help it dry and for adhesives to work. I will check with manufacturers re correct adhesives working with it ok. Any experiences good or bad?
    - However, in 2 x wetrooms I really don't want to put sheet membrane down (will use former trays for showers). They are smallish so would be easy to paint a liquid membrane. However will this stick to the anhydrite ok? Should I seal / prime the before the liquid membrane? If so what products work together etc (could be primer, then liquid membrane then adhesive so don't want anything coming apart over time / with any moisture getting in). Any experience on this gratefully received.
    - I was going to use no more ply around the shower area and then tape and seal the joints only, rest of walls we will use green plasterboard. Obviously will tape and seal around the former and up to the walls as per instructions.
    - The screed is only 40-50mm. Plan is to fit shower drain in insulation, lay & glue (what glue/sticky is best?) some oversized 18mm ply on the insulation (correct hole for drains cut in it), fix through the insulation to the slab below so it is rock solid. Then we will block out the tray area and we can pour the screed (with edges of ply being under screed where oversized). Then stick the former to the ply with adhesive (any issues here?). If we get the levels right should be then be flush with screed around it. Sound sensible?
    Few issues are the ply will be proud of the insulation so around the edges where oversized may only have 25mm of screed over it.
    I have these foam former trays that make me a touch nervous so they need to be fixed rock solid.
    Thanks in advance!
     
  2. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    Angela reason you don't want to use a membrane on the floor? Impey waterguard after priming with Bal apd would be my choice
     
    • Agree Agree x 1
  3. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    Anhydride screeds are very moisture sensitive, and shouldn’t be used in wet areas.
    A membrane is a far safer choice than paint on tanking.
    Membranes are on average only 1mm thick, it won’t cause height issues.
     
    • Agree Agree x 1
  4. jcrtiling

    jcrtiling Professional Tiler TTA Member

    Location:
    Salisbury
    As @hmtiling@hmtiling impey membrane is the only thing I would consider for the reasons @3_fall@3_fall said
     
    • Like Like x 2
  5. Julian Power

    Julian Power Guildford Contracts

    Location:
    Guildford
    Thanks. Is Impey Waterguard really worth the money? The Mira system is about 1/4 of the cost.
     
  6. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    There are a number of waterproof membranes available, all work. Some are easier to install than others.
    And it’s all about the install.
    Get that wrong, and you just might not as well have bothered.
     
    • Agree Agree x 1
  7. Ajax123

    Ajax123 Tilers Forums Pro - Screed Advisor Trusted Advisor Professional Tiler

    Location:
    Lincolnshire
    Hi Guildford contracts. If you want to give me a call on Monday I can tell you through the entire process properly. It sounds like you have already been given some snippets of incorrect advice I terms of roughing up and this helping the screed to dry both of which are technically inaccurate. I can also draw you up an NBS specification and point you toward decent quality screeders. Up to you 07966651006
     
  8. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Wimborne, Dorset
    Have you decided what former you will use?
     
  9. Julian Power

    Julian Power Guildford Contracts

    Location:
    Guildford
    The formers we have are aquafix, extruded polystyrene from PureAdhesion. Following feedback above I was then going to use a Mira Tanking kit membrane on the floor around the former.
     
  10. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    Alan (Ajax :arrowup:) is correct tho, the information you have on preparation is at best poor.
    With the amount of information you need to digest, I would recommend you take him up on his offer of a phone call.
    I’m sure we’d of covered it eventually, but a one to one with Alan, will be a much faster route.
     
    • Like Like x 1
  11. Ajax123

    Ajax123 Tilers Forums Pro - Screed Advisor Trusted Advisor Professional Tiler

    Location:
    Lincolnshire
    Offer is open 3fall....
     
    • Like Like x 2
    • Winner Winner x 1
  12. Julian Power

    Julian Power Guildford Contracts

    Location:
    Guildford
    Thanks everyone. I have spoken to the screed manufacturer technical dept, so much clearer. Interestingly I was told water is only a problem if it anhydrite is wet all the time..... Will try Ajax123 again today. Thanks
     
    • Like Like x 2
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