Thinset Over Painted Floor

Cracks and gaps can be filled with portland cement based fillers.

Thinset over painted floor. Not that they would endorse going over an oil based paint what you should do is scarify the paint off the floor. Paint used on concrete will not bond with the tile adhesive. Unfortunately the tile cannot be adhered directly to the painted surface. The polymer modified thin set mortars might bond to a latex paint but not an oil based paint.

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. Whether you have cracks chips or just a stained concrete slab thinset helps cover the old surface and create a new problem free area. Mapei ultrafor plus data sheet says to use their keraply latex admix in lieu of water when going over impervious surfaces.

Tile adhesive is expected to hold the tile in place not just for years but for decades without fail. Mortar cannot be installed directly over painted concrete itself. The safest way to approach questionable concrete is not to cover it over with cbus but to fix the concrete. The house was built in the late fifties and the slab floor has been painted at least once.

How to use thinset morter to resurface concrete. All paint will need to be removed before you begin installing the tile. It must be easy to work with and it must adequately fill in gaps between the tile and the substrate. It cannot cure too fast.

This surface is called a scratch coat. Otherwise you do. First a surface more textured and solid must be applied over the painted concrete. The floor is a 4 inch poured concrete slab over an unheated utility room.