Some whirlpool tubs or spas have a finished side or two, so framing and finishing the side panel are not required. Rectangular models install much like a standard tub, except that a GFCI electrical receptacle is required. Triangular whirlpools fit into a corner. If the whirlpool has an integral spout, follow the manufacturer’s instructions for running supply lines to the unit. Large whirlpools are heavy when filled with water, so you may need to strengthen the floor by adding joists. Check the whirlpool’s instructions and local codes. Ideally, it’s best to lay flooring after the tub is framed and installed but before any tiling is done. A whirlpool needs an extra access panel to reach the electric pump. A 2x4 frame is covered with backerboard and then tiled. The whirlpool’s flange rests on tile, but the tub’s weight must be supported by a mortar bed. Set aside two or three days to frame, install, and tile a whirlpool tub. Before you start, measure the space carefully, taking into account the framing, backerboard, and tile thickness.
