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 grouting is complete, clean all tools to remove grout before it dries on. Keep people off the freshly grouted floor for 24 hours. You may also want to seal the grout lines and or tiles if they are in a wet area or may be prone to staining. Wait about 72 hours after install before applying a sealer.