How to Frame a Tub Alcove

Measure the length and width of the bathtub with a tape measure. Determine the height of the alcove.

Measure four sections of 2-by-4-inch lumber 4 inches longer than the width of the bathtub. Measure two additional sections equal to the length of the tub. Cut these sections to length with a circular saw; they will form the top and bottom plates of the alcove frame.

Measure and cut sections of 2-by-4-inch lumber 4 inches shorter than the finished height of the alcove. These sections form the vertical studs of the alcove frame. You need one stud for each 16 inches of length on one side of the tub and for each 16 inches of width on both ends of the tub.

Lay out two length plates on their 2-inch sides. Place a stud between the plates at both ends and at 16-inch intervals between the end studs. Drill two pilot holes through the top and bottom plate into the ends of each stud with a drill. Insert and tighten 4-inch wood screws through the pilot holes with an electric screwdriver. Repeat this process with the remaining length plates and width plates.

Stand the three alcove frame sections on their bottom plates. Assemble the sections so the length frame section is even with the ends of both width frame sections. Drill pilot holes through the sides of the top and bottom width plates into the top and bottom length plates and secure the sections with 6-inch wood screws.

Set the frame in place. Drill pilot holes through the bottom plates into the subfloor at 4-inch intervals. Insert and tighten 4-inch wood screws to secure the alcove frame to the subfloor. If the alcove frame extends to the ceiling, repeat this process with the top frame plates to secure the alcove frame to the ceiling.