I have a situation where a front porch, 20' x 6.5' has 1968 vintage red clay (porcelain?)tiles on it and they need to be replaced. It appears they imbedded the tiles into the proch when they poured it, I have tried the electric hammer chisel as well as a sharper air chisel, and they do not want to come off. Has anyone had any experience tiling over this type of tile? They are the red, semi-porous 4x4 tiles used a lot around here in the 1960's1970's. I'm thinking about using the chisel to take some of the face off the tiles, then hitting it with hydrochloric acid to clean and etch them a little. We are putting 12x12 tiles on the porch. Any advise would be appreciated.
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Tiling over old tiles.