Tile Over Painted Concrete Block Wall

A scratch coat will give the mortar something to hold on to instead of the layer of paint over concrete.

Tile over painted concrete block wall.

Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint. If the concrete has been sealed better adhesion may be achieved by going over the concrete with a grinder to create a rough surface. Cracks and gaps can be filled with portland cement based fillers. Water should readily absorb in the concrete as an indication that it.

Remove any remaining stain or paint from the wall with a right angle grinder fitted with wire brush. Tiling over painted block can be problematic due to the inability of the tile adhesive to stick directly to the painted blocks. If the paint comes loose so does the tile. Removing the paint is a long and tedious process but by creating an intermediate surface between the painted blocks and the tiles you can solve the adherence issue without the need for paint removal.

A properly painted concrete block wall will be virtually maintenance free for many years but the same wall not properly painted can be a maintenance nightmare. The board is then pressed into place on the wall and adjusted for plumb and level. This process will work on painted or bare concrete. Use a pressure washer fitted with a paint stripping tip to blast the concrete wall clean of all stain paint and dirt.

The cinder block wall needs to be thoroughly scrubbed of dust from grout and chunks of loose brick so that the new tiles will be able to adhere easily and not fall from the wall or crack or crumble over time. There are just a few critical differences between a good and a bad paint job. First a surface more textured and solid must be applied over the painted concrete. This surface is called a scratch coat.

When the concrete wall is plumb tile can be applied directly to the surface or a metal lath can be fastened to the wall with a scratch. Tiles are ideal for showers bathtubs and backsplashes. You should either strip or bead blast the concrete and thoroughly clean it. 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. If you want to update your kitchen or bathroom walls with tiles you don t have to remove existing painted.