Step 2: Cut and rabbet the stool

trimming out a window «»
Place a side casing against the wall, aligned with the reveal line on a side jamb. Mark the wall at the casing's outside edge. Repeat for the opposite jamb. Measure between the marks, add 2 inches, and cut the stool to this length.

Place the stool face down on the sill with its back edge against the sill trim. Mark where the top of the trim meets the stool’s end.

Keeping the back corner against the sill trim, slide the end of the upside-down stool against the jamb. Make a vertical mark where the end of the stool touches the jamb.

Connect the two marks with a square and make an X in the area defined by the lines; this is the waste that will be cut out to make the rabbet.

Remove the waste in two separate rip cuts on a table saw.
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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