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    If I use Ditra do I need to use backerboard as well?

    Will do Stewart, will post some pics as soon as done. Thanks.
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    If I use Ditra do I need to use backerboard as well?

    Hi AstonTiling, thanks for your reply. Yes, I fully appreciate that there are two different jobs going on here, thanks to the advice I've received on the forum over the last couple of days. I have decided to use Ditra for certain. My issue is that I had previously planned to cross-board...
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    Limestone floor cracking.

    Hi Polly As I'm just about to have Moleanos Limestone laid in our new 7.5m x 5.5m kitchen, and listening to various people talking about different sub-floor requirements I'd be very interested to hear how your situation ended up? Cheers Paul
  4. H

    If I use Ditra do I need to use backerboard as well?

    Hi I got a lot of useful advice over my last post, thanks guys: http://www.tilersforums.com/tile-adhesive-grout-substrate-preparation/46295-ditra-not-ditra.html I had reached the decision, as suggested by Stewart, which was: So I was going to put down No More Ply over the chipboard...
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    To Ditra or not to Ditra...

    OK guys, think I have decided what to do. a) Swallow the cost of the 12mm ply I have in my barn. b) Lay a backer board (6 or 10mm) c) Lay a membrane (Ditra or Dural) Hopefully get a good night's sleep in the knowledge that my new and very expensive floor is going to stay looking good...
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    To Ditra or not to Ditra...

    Floor is approx 5.5m wide and yes, it does have brick piers every 1.5m or so. Largest span maybe around 1.8m, but in that small area I doubled up on the 4 x 2's before laying the chipboard floor. And I think that with the 22mm green 9x2 flooring sheets well screwed down and 12mm ply over I...
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    To Ditra or not to Ditra...

    Well money is always an issue, but this sort of mistake can be soooo expensive so it's a case of getting to the point where 'better safe than sorry' meets 'if you have a decent belt then you really don't need those braces' Absolutely. Last chap in said he always overboards floorboards with...
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    To Ditra or not to Ditra...

    Don't apologise John, all thoughts welcomed. Any thanks for that link.
  9. H

    To Ditra or not to Ditra...

    By that I'm assuming you mean labelled as a flexible adhesive (such as the Larsen one I have)?
  10. H

    To Ditra or not to Ditra...

    Thanks AstonTiling, your 'everything moves throughout the year' point does make sense.
  11. H

    To Ditra or not to Ditra...

    Thanks Doug, that I can understand. But on a long-standing floor that has been significantly strengthened and really does feel darned solid, and with no underfloor heating or any significant underfloor moisture levels that are likely to bring about any lateral movement, I'm guessing that matting...
  12. H

    To Ditra or not to Ditra...

    Thanks John, but the engineer in me can't really see how a flexible 3mm membrane can really add much in the way of vertical shear strength. If the floor's solid then it's solid (well, within reason, you know what I mean), if it's really not solid then no thin plastic membrane in the world is...
  13. H

    To Ditra or not to Ditra...

    If deflection is the issue that is something I can assess and make a judgement on (pint glass or no pint glass.) But if that's the case why do people say that with a room my size (7/5m x 5.5m) I should consider using matting? What difference does the size make, assuming supporting brick piers...
  14. H

    To Ditra or not to Ditra...

    Now Dan you're trying to confuse me... :yikes: what is the difference? performance? price? other?
  15. H

    To Ditra or not to Ditra...

    'The old ones are the best'... but that is at least a demonstrable test! I'm now anticipating the look on my wife's face when she sees me walking around a glass of water on the floor. She'll think I've listened to her at last and it's some AA mantra thing... Now I wonder, will my 16 stone bulk...
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    To Ditra or not to Ditra...

    Two said would have preferred to see 15mmm but 12mm should be OK All said should be fixed down at max 150 centres. Three said make sure it's sealed (one with tile primer one said SBR fine, one advised PVA fine) None came up with Stewarts suggestion of thinner backer board & Ditra. It's a...
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    To Ditra or not to Ditra...

    Thanks Dan. What would a typical deflection test comprise? And is the use of a membrane due to length of room and lateral movement (expansion/contraction I guess?), or is the robustness of the sub-floor and vertical deflection the issue? If the latter, I confess I don't see how a flexible...
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    To Ditra or not to Ditra...

    Thanks John. I have asked the dealers but have yet to receive their reply. And as for taking advice of tilers, 2 say yes, 2 say no need. It's an expensive one to get wrong...
  19. H

    To Ditra or not to Ditra...

    Thanks for the reply John, appreciated.
  20. H

    To Ditra or not to Ditra...

    Thanks Stewart. Other than the fact that I have 13 sheets of 12mm WBP sitting in my barn ready and waiting (so not quite the answer I was hoping for) that is Plan b then... Any more thoughts gratefully received...

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