Tiles and joints: how to grout joints and protect them from mold?

Joint grouting and their subsequent protection against moisture and mold is the final stage of cladding work, which gives the surface a finished and neat look. For tiles and joints, the 80/20 rule works great: first, solve two or three main problems related to waterproofing, ventilation, and the cleanliness of the base, and only then improve the small details of the interior.

Before applying the grout, thoroughly clean the joints from leftover tile adhesive, dust, and remove plastic cross spacers to a depth of at least a third of the tile thickness. Prepare the grout mixture strictly according to the manufacturer's instructions, using clean water and a low-speed mixer to avoid the formation of air bubbles.

Apply the composition with a rubber spatula, moving diagonally relative to the joints to press the mixture deep into the space between the tiles and fill all voids. Remove excess grout with the same spatula, holding it at a 90-degree angle to the surface so as not to wash out the fresh mortar from the joints.

After the grout begins to matte and set, usually in 15-30 minutes, gently wipe the cladding with a damp sponge, rinsing it frequently in clean water. To protect the joints from moisture, dirt, and the appearance of fungus, treat them after complete drying with a special silicone sealant or a deep-penetrating protective impregnating compound.