What You Need
Drywall mud and skimming tool
Boards for base, cap, verticals, and ledge in desired width and depth
Desired molding for under ledge
Nail gun, nails
Caulk and caulking gun
Surfacing paste (we used Spackle) and sandpaper
Primer, paint, and paint roller
Snap a chalk line at desired height. For textured walls, skim drywall mud below the line (see right). Let dry.
Measure, cut, and install baseboard and cap (the bottom and top horizontal boards, respectively). Next, install the vertical boards, ledge, and molding. Ensure all are level and plumb as you are installing them. Use construction adhesive to glue the pieces to the walls.
Secure the boards with nails as you work, using a nail gun.
Tip: Don't overnail. Drive in only as many nails as you need to hold the piece of molding firmly against the wall.
If desired, attach a ledge piece atop the cap board.
Caulk all seams. Spackle nail holes and sand smooth.
Prime walls and boards. When dry, paint upper walls your desired color and paint lower walls and boards white. Let dry.