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.
Check the recommended cure time on the mortar packaging and follow that. It varies depending on the type. I generally wait 36-48 hours to apply the grout afterward (I am cautious, that is far more time than is generally needed). â James Jul 14 '14 at 17:54. Better to give it time and make a trip to the laundromat than to ruin what looks like a nice tile job by being in a hurry. Nothing like a trip to the laundromat to make you more fully appreciate not having to go there all the time. I'd want to aim for a week's cure before putting in anything that heavy.