Tile Over Painted Concrete Block Wall
How to tile over painted drywall.
Tile over painted concrete block wall. 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 scratch coat will give the mortar something to hold on to instead of the layer of paint over concrete. The safest way to approach questionable concrete is not to cover it over with cbus but to fix the concrete. 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.
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. You should either strip or bead blast the concrete and thoroughly clean it. Tiles are ideal for showers bathtubs and backsplashes. This process will work on painted or bare concrete.
The board is then pressed into place on the wall and adjusted for plumb and level. Water should readily absorb in the concrete as an indication that it. 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. First a surface more textured and solid must be applied over the painted concrete.
Tiling over painted block can be problematic due to the inability of the tile adhesive to stick directly to the painted blocks. If you want to update your kitchen or bathroom walls with tiles you don t have to remove existing painted. Remove any remaining stain or paint from the wall with a right angle grinder fitted with wire brush. Tile cannot be attached directly to painted concrete as the thin set will not adhere well to the paint.
If the paint comes loose so does the tile. There are just a few critical differences between a good and a bad paint job. Cracks and gaps can be filled with portland cement based fillers. Mortar cannot be installed directly over painted concrete itself.
This surface is called a scratch coat. In this video this old house landscape contractor roger cook dresses up a block wall with stone veneer panels.