Mark Donovan is remodeling a ceramic tile shower, and shows how to remove the old backer board. First remove the old screws, starting at the bottom of each board and working your way up (leave a few screws so the board doesn't fall). Sometimes screws may be hiding under old mortar. Score the joint between the top board and the ceiling with a utility knife to prevent ceiling damage. Use a pry bar to gently remove the old backer board, being watchful for pipes. Remove the last screws, then the board. Clean up will be easy.
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