how long till tile sets
Time Before Grouting. Drying time varies with ambient air temperature, humidity and moisture content of the mortar when applied. In general, mortar must set at least 24 to 48 hours before grouting. Apply mortar when the ambient air temperature is between 50 and 100 degrees Fahrenheit. Ideally, temperatures should not exceed this range for at least 72 hours after application. The area should be well-ventilated but not exposed to high wind or heat. Even when mortar appears dry on the outside edges of the tile, it may not have fully cured beneath the tile surface. Allowing proper time for the mortar to cure before grouting will ensure your tiled surface will last for at least decades.