Shim any gaps with additional layers of foam tape, adding extra layers to compensate for an out-of-square corner ... wall material," says Sanders. Just clean them as you do the rest of the shower ...

Once the old caulk is gone, remove any loose grout between the walls and the ... Mask the wall corner gaps first. Start by finding the largest gap between the tub/shower and the walls.

If you've put up wall tiles before ... floor tiles need more grout to provide traction, especially in areas that are prone to becoming wet like your kitchen and bathroom. To pick an exact joint ...