Substrate Query

[mart1]

This method of using a slip membrane has been used throughout the construction industry for many a year and is still probably classed as a trade secret. just think about it.. you are debonding the finished surface from the main substrate thus it does not matter what problems may occure with any settlement. Believe me this works and i can say that with all honesty.

 

[White Room]

I'd need to see it, Then I would probably understand it a bit more.

 

[pjtiler]

oh this old chestnut re appearing eh
fine for lateral movement but horizontal quack quack

 

[Pawelzik]

...wall has been knocked down and the tiles will now cover ply (new area) to concrete(old area). Tried to talk customer into ditra matting but he didn't really want to know....

As Dave said I suppose too that mesh works only is too weak. :stupid:
Insist on the uncoupling method , you are right and the pro, otherwise you can´t guarantee or stay away from the job.

Or lets see it from the customers side: I think he/she can understand the deflection problem so he/she should understand that some additional work must be done. Are we talking about a huge amount of money? No, not realy compared to what it will cost if the tiles are laid, will crack and a big area must be lifted up again for repair works.

May be you can ask Wetdecs if there is a thin uncoupling matting for less.
Martin

 

[grumpygrouter]

This method of using a slip membrane has been used throughout the construction industry for many a year and is still probably classed as a trade secret. just think about it.. you are debonding the finished surface from the main substrate thus it does not matter what problems may occure with any settlement. Believe me this works and i can say that with all honesty.

Not really sure what you are saying here Mart. This indicates to me that you have not got the top surface attached to the substrate but just to a piece of film, is that right? If so, isn't this exactly what Ditra or Durabse does as an "isolating" layer? These substances do not provide security against deflection, only lateral movement. I don't see how a 5 micron thick sheet of polyethylene can stop several dozen kilograms from deflecting a floor joist for instance.

Have you go examples you can show us or some sort of document?

Cheers.

 

[CUSH68]

Got some sense out of customer today. He has changed his mind about the three size pattern and now wants 600 x 300 porcelain brickbond. Is this a case now where if the setting out alows I can run a grout line along where the 2 substrates meet and fit an expansion joint ( or matching Silicon joint)?
Thanks all for the ongoing help

Mark