Grout looses moisture too rapidly when curing in hot and dry weather. When this happens, the grout will not dry hard and may also dry an uneven color. Follow these installation tips:
- Use a polymer-modified grout, such as Polyblend to retain moisture and promote proper drying conditions.
- Keep it cool. Use cool water to mix grout powder; never use hot or warm water. Keep ice on hand to cool down the water. Keep the grout bags and mixing container cool.
- Do not mix the grout with excessive amounts of water or remix with additional water. This will cause a lighter, soft and powdery grout.
- Avoid midday grouting in extreme heat. Grout in the early morning or late afternoon when temperatures are cooler.
- Dampen the tile with clean, cool water prior to grouting. This prevents porous tile from drawing the moisture out of the grout too rapidly and helps to cool down the tile.