Thinset Over Painted Floor

It cannot cure too fast.

Thinset over painted floor.

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

Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint. Whether you have cracks chips or just a stained concrete slab thinset helps cover the old surface and create a new problem free area. All paint will need to be removed before you begin installing the tile. 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.

How to use thinset morter to resurface concrete. The house was built in the late fifties and the slab floor has been painted at least once. Mapei ultrafor plus data sheet says to use their keraply latex admix in lieu of water when going over impervious surfaces. Mortar cannot be installed directly over painted concrete itself.

The floor is a 4 inch poured concrete slab over an unheated utility room. Unfortunately the tile cannot be adhered directly to the painted surface. 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.

First a surface more textured and solid must be applied over the painted concrete. Paint used on concrete will not bond with the tile adhesive. The safest way to approach questionable concrete is not to cover it over with cbus but to fix the concrete. It must be easy to work with and it must adequately fill in gaps between the tile and the substrate.