Thinset Over Painted Floor

Whether you have cracks chips or just a stained concrete slab thinset helps cover the old surface and create a new problem free area.

Thinset over painted floor.

Mortar cannot be installed directly over painted concrete itself. Otherwise you do. Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint. 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.

It cannot cure too fast. The house was built in the late fifties and the slab floor has been painted at least once. Cracks and gaps can be filled with portland cement based fillers. Paint used on concrete will not bond with the tile adhesive.

How to use thinset morter to resurface concrete. The safest way to approach questionable concrete is not to cover it over with cbus but to fix the concrete. First a surface more textured and solid must be applied over the painted concrete. Unfortunately the tile cannot be adhered directly to the painted surface.

All paint will need to be removed before you begin installing the tile. Installing tile over painted concrete adds a few extra steps to your tiling job. A scratch coat will give the mortar something to hold on to instead of the layer of paint over concrete. The polymer modified thin set mortars might bond to a latex paint but not an oil based paint.

Mapei ultrafor plus data sheet says to use their keraply latex admix in lieu of water when going over impervious surfaces. The floor is a 4 inch poured concrete slab over an unheated utility room. This surface is called a scratch coat. Tile adhesive is expected to hold the tile in place not just for years but for decades without fail.