Gyvlon floor....

[Rich]

I was told this week by a supplier that Mapei's Keraquick is suitable for tiling onto anhydrite screads, is this a load of rubbish? I am tiling onto the Gyvlon LL in a couple of weeks. Im laying Ditra but Im not sure what adhesive to use to lay it. Would feel better about using a gypsum addy to be honest. However if Keraquick is suitable it would open up another option.

 

[Ajax123]

Dylante - it is for the manufacturers of the relevant adhesives to decide and warrant that their products are suitable for any given installation. However the facts are that cement and gypsum are chemically incompatible so to use them in the same installation should be carried out with absolute attention to this fact.

Statistically speaking I know of no failures where Gypsum adhesives have been used. I know of lots of failures where cement has been used. Bear in mind that the failures are not necessarily due to the fact that cement adhesive has been used but more to do with something within the installation leading to a lack of robustness in the installation. Cement on Cement is a very robust system, Gypsum on Gypsum is a very robust system. Cement on Gypsum is not and so you must do things absolutely properly and make sure you use a system which is as robust as it can be. The UK based businesses have generally shied away from Gypsum Adhesives because there is no British Standard for there manufacture - the current UK standards only deal with cement based adhesives. In Europe where there are lots more gypsum based adhesives available and where they are used more routinely with these screeds there are very very significantly fewer failures.l

 

[Rich]

Thank you very much Alan.

Your advice and knowledge is outstanding

 

[Daz]

Weber also do one..

I've just done 65sqm with the Weber addy and it was good / interesting :lol:
They don't have a UK sales channel for the product yet so Mark Birch is deffo your main contact.

I'm gonna do a thread on the screed and adhesive soon (just trying to stay awake long enough to make it interesting :lol.

 

[DHTiling]

DAz, how did you find the adhesive to work with.. good contact with tile or did you just use it for the a membrane..?

 

[Daz]

I used it to fix porcelain 60 x 60 tiles. I used a 10mm notched trowel and backskimmed the tiles and the coverage was excellent. I easily achieved a good bond.

I took quite a few pics so will try and dig out some interesting ones when I have some time.
The main point to be aware of is the open time. I thoroughly primed the floor but the adhesive was skinning over in approximately 10 mins, however to be fair to Weber they did pre-warn me of this .

 

[DHTiling]

So with the weber one they do advise to prime..?

 

[Daz]

Yes Dave, they do advise to prime, but the adhesive comes in from France and my french isn't as good as it used to be, :lol:. I did manage to work out the mixing ratios though .

 

[DHTiling]

I have a couple bags DAz, just not used it yet ot got instructions for it's use.. but IMO Gypsum adhesives are the best way with Anhydrite screeds..