Step 6: Stack the Boxes.

stacking the boxes for a columned room divider
Photo: Ryan Benyi
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Apply construction adhesive on top of the filler panel and stack the first box, aligned at the edges. Tack it in place with a pneumatic brad nailer and 1¼-inch brad nails. Stack and fasten the next two boxes in the same way. Shim the gap between the top box and the wall, then drive at least one deck screw through the box and shims and into a stud or an anchor. Make sure the top box is level, then glue and nail another filler panel on top.
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    Tools List

    • 100-foot tape measure
      Tape measure
    • straightedge guide
      Straightedge
    • bar clamp
      Clamps
    • circular saw
      Circular saw
    • caulk gun
      Caulk gun
    • drill
      Drill/driver
    • Countersink bit
      Countersink bit
    • four-foot level
      4-foot level
    • pneumatic brad nailer
      Pneumatic brad nailer and air compressor
    • combination square
      Combination square
    • miter saw
      Miter saw

    Shopping List

    ¾-inch medium-density fiberboard (MDF)
    Get three 4-by-8-foot sheets for an 8½-foot ceiling.

    2x8 lumber to build the base

    Shims

    Solid crown molding to trim the capital and the cabinet top

    Baseboard molding

    ½-inch and ¾-inch quarter-round molding
    for the base cap and shoe molding

    1½-inch MDF screws to assemble the boxes

    2½-inch deck screws to install the base and the blocking

    1¼-inch brad nails

    Construction adhesive

    Wood filler and paintable caulk

    Primer and paint