Use a T-square to mark the cut lines on the plywood.
Cut the plywood to size, running the circular saw across the width of the board.
Using the original sub-floor nails as a guide, mark the floor joist locations on the wall to know where to insert the screws.
Lay the plywood in place on the floor.
Run a chalk line off the floor joist to mark the wall. Then, drive deck screws every 8 inches along the line.
Bring in the cement board and lay it down on the plywood (Image 1). Screw the cement board into the plywood about every 6 inches (Image 2).
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85 Dollar Store Hacks