Thinset Over Painted Floor

First a surface more textured and solid must be applied over the painted concrete.

Thinset over painted floor.

It cannot cure too fast. The floor is a 4 inch poured concrete slab over an unheated utility room. The polymer modified thin set mortars might bond to a latex paint but not an oil based paint. Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint.

Tile adhesive is expected to hold the tile in place not just for years but for decades without fail. How to use thinset morter to resurface concrete. Mapei ultrafor plus data sheet says to use their keraply latex admix in lieu of water when going over impervious surfaces. The house was built in the late fifties and the slab floor has been painted at least once.

Paint used on concrete will not bond with the tile adhesive. Installing tile over painted concrete adds a few extra steps to your tiling job. Not that they would endorse going over an oil based paint what you should do is scarify the paint off the floor. Otherwise you do.

Whether you have cracks chips or just a stained concrete slab thinset helps cover the old surface and create a new problem free area. It must be easy to work with and it must adequately fill in gaps between the tile and the substrate. Mortar cannot be installed directly over painted concrete itself. Unfortunately the tile cannot be adhered directly to the painted surface.

Cracks and gaps can be filled with portland cement based fillers. The safest way to approach questionable concrete is not to cover it over with cbus but to fix the concrete. Tile will stick to most rigid level surfaces including painted wood provided the correct preparation work is done to ensure the adhesive or mortar will stick to the floor surface. Whether wall or floor tile that tile needs to thoroughly stick to its base surface demands placed on tile adhesive are both extensive and steep.