Tile walls in Troy bathrooms require cement backer board, not standard gypsum drywall. After framing with pressure-treated lumber, cut 1/2″ cementitious panels to size. Fasten with corrosion-resistant screws every 8″ into studs. Tape seams with alkali-resistant mesh and cover with thinset mortar. Seal screw heads and joints with waterproofing membrane. This system prevents mold, supports tile adhesion, and meets Capital Region code for wet-area installations.