Can Kerdi be installed over drywall?

Yes. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower.Click to see full answer. Keeping this in consideration, can Kerdi be installed over painted drywall?No paint primer allowed. No drywall mud allowed. And this install over plain drywall is only approved in dry zones so if your drywall is in the shower it will need to be removed. In the shower switch to cement board for your Kerdi.Subsequently, question is, should drywall be primed before tiling? Seal seams on new drywall with drywall tape and compound and let dry. Prime the area to seal the new drywall. Prime an area larger than you plan to tile to minimize the cut-in work when you paint the rest of the room. Or, prime and paint the entire wall/room before starting with your tile project. Also to know, can you install tile over drywall shower? The bottom line is that drywall (and this includes moisture resistant drywall) should never be used behind tile in wet areas (showers and tub-shower combinations). This is especially important in a shower located on an outside wall, but also helps even if the shower is on an inside wall.Can you use thinset on painted drywall?Thinset bonds best with a porous surface, such as new drywall or backerboard, which needs no preparation, but you can apply it over painted walls or tiles that are flat and in good condition as long as the shiny finish is removed. Use the type of thinset mortar specified for your particular tile.