We are installing a tile backsplash in our kitchen on two walls. The first area is drywalled. Can the tile be cemented directly to the drywall with thinset or does it need backer? The drywall can be “raw” or primed.
A second area will attach the tile to the back of a cabinet. Can the tile be attached directly to the plywood? This tile will be above the sink. The plywood can be “raw”, primed, or install hardiboad backer.