Tiling on anhydrite screed.

[aggy]

Would PVA work to prime an anhydrite screed before tiling on it or does it have to be a specialist ie expensive primer?
It will be in dry rooms so water messing with the PVA will not be an issue. The screed will be sanded etc by the installers.

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[Mike]

defo no pva as a primer with tiles. plenty of people on here to help with the right stuff.

 

[Ajax123]

A "specialist" primer is not expensive.

Some adhesives for these screeds do not need a primer at all e.g. Kerakoll H40 ideal and Benfergyps from Benfer. However I would always primer anyway personally. I would also use a Gypsum based tile adhesive rather than a cement based. If you must use a cement based adhesive then you would be best to go for a water dispersible epoxy primer.

PVA is not suitable as a primer for any type of screed prior to tiling.

 

[aggy]

Ok, thanks for the quick replies, thats a pity as I've got gallons of PVA.
Any particular recommendations for primer?