If it is plywood not osb not pressboard and not luan you.
Ceramic ceiling tile over wall board.
Cover all of the corners joints and seams including the joint where drywall and cement board meet with the fiberglass mesh tape.
Tile on tile or as i say it.
Continue placing the first course of tiles in the same manner using spacers.
For countertops use 3 4 inch plywood beneath the backer board.
Definitive answer to this question for shower wall surrounding walls and ceiling is redguard over cement based backer board significantly better than redguard over regular greenboard.
Step 1 clean tile to ensure that all dirt and foreign surfaces are removed from the surface.
May be able to tile over it but the safer method would be to put a 1 4 cement board over it.
Placing beadboard over the tile requires first preparing the tile surface and applying the boards over the top.
And it lasts for 20 years.
Both green board and cement board are excellent substrate for wall finishes such as tile or frp fiberglass reinforced panels albert penna of dna architects says that properly installed tile or frp helps protect walls from the elements grease water pests throughout the operation of a commercial kitchen.
Screws secure the cement board to the wall studs.
For flooring the backer board should be installed over a 5 8 inch thick osb or plywood base.
Step 1 prepare the wall ceramic tiles can be installed directly on drywall plaster or if they are in moist areas onto green drywall or even better cement backer board.
How to install tile backer board.
Ceramic tile advice forums.
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Tile is laid onto the cement board with thinset mortar or mastic.
Screw the drywall to the studs.
Cut drywall to fill in between the existing wall or ceiling and the cement board.
Complete the job by piecing in any missing drywall and taping the seams.
Beadboard is available from any home improvement store along with all other materials necessary to cover the tile.
Half inch cement backer board is ideal for most tiling jobs including walls floors countertops and ceilings.
Many moons back it was required that mastic be skim coated on the mr board walls and allowed to dry before the tile was set.
Place strips of blue painter s tape over the tile face sticking each end to the wall to prevent the tiles from sliding.
Cement board and a liquid membrane in this application cement board is installed directly onto the studs.