This stress will be tensile during temperature decrease, or compressive. during temperature increase. If the compressive stress level exceeds the column buckling resistance of. the restrained length, then lateral buckling (or snaking) will occur.
Dry Time. In most cases, you should allow the grout to dry overnight before using that room as total dry time may take up to 24 hours. If you are thinking about sealing your grout after you have installed it, you need to wait even longer than that so that all of the moisture has had time to be released.
After the grout sets for 15-30 minutes (you may have to work in sections if you have a large area to cover) wipe up the excess grout with water and sponge. Wait three hours and do it again, this time making sure there isnât excess grout on the tile or outside of the grout line.