I just replaced the riser rail in our electric shower, but the fittings were slightly different, so now I have 2 bare holes in the tiles. Should I be concerned about moisture getting into the wall, and if so what‘s the best way to fill these holes? Would polyfilla be enough?
Since this is now a hole you don t want to use any grout or thin set since these are cement based and will wick water through the hole. Tile caulk which you can get to compliment the tile or grout color is just ok to but I don t suggest these types of caulks. They are silicone and latex based and are water soluble. Best thing to use is a pure silicone caulk. Unless your tiles are white a clear caulk would look the best just to hide the holes . Any questions you can e mail me through my avatar and check my qualifications there. GL
PolyFilla would probably be ok, but i would use the grout which you used for the tiling originally. Don't forget to seal it, or it will discolour.
You definitely don't want moisture to get into your walls. It will create problems. I'd recommmend a silicone-based caulk, you can probably find one that matches your tile or grout color somewhat. If you need a more cosmetic fix, replace the individual tiles that have holes drilled in them. You can epoxy them or thin set them in place, then regrout.
