Can you recommend a reliable grout for porcelain stoneware for underfloor heating?
The area is 140 square meters. I was planning to use CE 40 AQUASTATIC from Ceresit, but the reviews say that it crumbles and smears when wet cleaned.
I recommend Mapei Ultracolor.
Even though the instructions say that the product should be washed off after 40 minutes, it is better to do it 15-20 minutes after application. It hardens very quickly.