Step 4: Install side casing

Tom Slva trimming out a window «»
Cut a square end on a piece of casing and stand that end on the stool. Mark where its inside edge meets the head jamb's reveal line. Make a square cut at that mark. Repeat on the opposite side.

Apply a bead of glue to the casing where it overlaps the side jamb and on the end that sits on the stool; line up its edge with the reveal line. Facenail the casing into the jamb with 4d finish nails, and to the wall with 8d finish nails. Wipe up squeezed-out glue. Repeat the process on the other side.

Nail up through the bottom of each horn into the ends of the casing with two 18-gauge or 6d nails. If hand nailing, drill pilot holes.

Tip: To cut snug-fitting beveled ends, put casing face up on 1/8-inch-thick scrap 3 inches from the miter-saw blade.
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    Tools List

    • finish hammer
      20-ounce finish hammer
    • hand plane
      Hand plane,
      for trimming jamb extensions
    • 16-foot tape measure
      Measuring tape
    • router
      Router,
      for making stool profile
    • random orbit sander
      Random-orbit sander,
      or hand sanding block
    • jigsaw
      Jigsaw,
      for notching stool and profiling apron
    • pneumatic finish nailer
      Pneumatic nailer,
      for attaching casing
    • pencil compass
      Compass,
      for transferring marks and reveal lines
    • table saw
      Table saw,
      for cutting rabbet in bottom of stool
    • try square
      Square,
      for marking casing, stool, and apron
    • utility knife
      Utility knife or chisel,
      for trimming drywall and adjusting fit of stool
    • miter saw
      Miter saw,
      for crosscutting trim pieces to length
    • nailset
      Nail set (to recess heads of hand-driven nails
    • drill
      Drill with 1/16-inch-diameter bit,
      for making pilot holes before hand nailing

    Shopping List

    1. WOOD MOLDING

    2. CARPENTER'S GLUE

    3. PENCIL

    4. PAINT OR STAIN

    5. 120-GRIT SANDPAPER

    6. WOOD PUTTY

    7. 4D AND 8D FINISHING NAILS