Asked by: Engracio Alfaro-Troyashome and garden indoor environmental quality
What happens if you use modified thinset on Kerdi?
Last Updated: 19th April, 2021
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In respect to this, what Thinset do I use with Kerdi?
Unmodified thin-set mortar is recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength.
Also, should I use modified or unmodified thinset? It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. However, unmodified thinset should be used between the membrane and the tile.
Keeping this in consideration, what happens if you use modified thinset on Ditra?
The problem with using a modified thinset is that it takes forever to dry over Ditra, especially with porcelain tile, being that it has an impervious barrier above and below. Schluter has said that if you use a modified thinset to set the tile that you can have to wait as long as 7- 10 days JUST TO GROUT.
Is unmodified thinset waterproof?
All portland based cementious products will allow water to pass through. The latex modified is more resistant due to the latex that is mixed in with the adhesive but that doesn;t make it "waterproof". The latex also allows a bit more flex in the tile and substrate. As Jason described, thinset itself isn't waterproof.