Thinset Over Painted Floor

If the paint is not well attached then as the thin set adhesive dries and shrinks it might pull the paint loose.

Thinset over painted floor.

Thinset mortar is your default tile mortar for most indoor and outdoor applications. Unfortunately the tile cannot be adhered directly to the painted surface. The thin mix is laid over. A latex based thin set adhesive should be used over the latex based paint.

The floor is a 4 inch poured concrete slab over an unheated utility room. The house was built in the late fifties and the slab floor has been painted at least once. Whether you have cracks chips or just a stained concrete slab thinset helps cover the old surface and create a new problem free area. Apply a coat of sanding sealer or tile prep sealer to the floor with a paint roller.

Installing tile over painted concrete adds a few extra steps to your tiling job. Thinset tile mortar has a smooth slippery consistency similar to mud. Thinset is a mortar that is made of portland cement silica sand and moisture retaining agents. It is applied to the substrate with a notched trowel.

This surface is called a scratch coat. First a surface more textured and solid must be applied over the painted concrete. Mortar cannot be installed directly over painted concrete itself. The painted surface has to be cleaned properly to ensure an adequate bond.

This will seal the wood and create a matte finish that will adhere to the tile well and help to stabilize the. Paint used on concrete will not bond with the tile adhesive.