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.
The grout process is similar but immediately after working a smallish area, say 4 x 4, a barely moist, appropriate sponge should be used in the initial swipe/clean up. As the grout drys, which will be fairly quick, a wetter sponge can be used. Grout too should be allowed 24 hours to be safe. Steven Wolf. Obviously there are Mastiks like some used for verticle installations that will dry/set/cure faster, but even a decent bathroom wall tile job should be no less than a 2 day process.