Thinset Over Painted Floor

Thinset mortar is your default tile mortar for most indoor and outdoor applications.

Thinset over painted floor. Only use epoxy and latex thin set products that state they can be used for bonding tile to paint. A latex based thin set adhesive should be used over the latex based paint. This will seal the wood and create a matte finish that will adhere to the tile well and help to stabilize the. 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. If the paint is not well attached then as the thin set adhesive dries and shrinks it might pull the paint loose. The house was built in the late fifties and the slab floor has been painted at least once. The painted surface has to be cleaned properly to ensure an adequate bond.

First a surface more textured and solid must be applied over the painted concrete. Thinset tile mortar has a smooth slippery consistency similar to mud. Mortar cannot be installed directly over painted concrete itself. Thinset is a mortar that is made of portland cement silica sand and moisture retaining agents.

All paint will need to be removed before you begin installing the tile. The floor is a 4 inch poured concrete slab over an unheated utility room. It is applied to the substrate with a notched trowel. This surface is called a scratch coat.

A scratch coat will give the mortar something to hold on to instead of the layer of paint over concrete. Installing tile over painted concrete adds a few extra steps to your tiling job.