In general, thinset should not be applied on a wet surface. The presence of moisture on the surface can interfere with the bonding process and compromise the integrity of the tile installation. Moisture can prevent the thinset from adhering properly to the surface, leading to a weak bond. As a result, the tiles may become loose or dislodged over time.
Moreover, moisture trapped underneath the tiles can cause several issues, such as mold and mildew growth or tile discoloration. These problems can further deteriorate the tile installation and pose a threat to indoor air quality and overall hygiene.
Exceptions to the rule
While it is generally not recommended to apply thinset on a wet surface, there are a few exceptions to this rule. Some thinset mortars are specifically formulated to be used in wet areas, such as showers or swimming pools. These specialized thinsets are designed to work in the presence of moisture and have improved waterproofing properties.
However, even with these specialized products, it is essential to ensure that the surface is properly prepared and any excessive moisture is addressed. Waterproofing membranes and other moisture barriers should be installed when necessary to protect the integrity of the tile installation.
Applying thinset mortar on a wet surface is generally not recommended. Moisture can interfere with the bonding process, leading to a weak tile installation. It is essential to properly prepare the surface and ensure it is dry before applying thinset. However, in specialized wet areas where moisture is present, there are specific thinset mortars available that are designed to work in these conditions. Nevertheless, it is always best to consult with a professional or follow the manufacturer’s instructions to ensure a successful and long-lasting tile installation.