Step 10: Sand the cap molding

Tom Silva installing baseboard
Photo by: Craig Raine
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To create tight fitting joints where cap molding meets at inside corners, cope the joints.

Join outside corners with miters, marking and cutting as in Step 5. Glue miter joints together; adding biscuits or nails may cause the narrow molding to split.

Where two caps meet on a long wall, make a scarf joint as described in Step 8.

Sand all the mitered corners lightly with fine sandpaper to remove any sharp edges. The baseboard trim is now ready to be primed and painted.

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    Tools List

    • miter saw
      Compound miter saw,
      for straight and angled crosscuts
    • coping saw
      Coping saw,
      for cutting copes in the ends of molding
    • four-foot level
      4-foot level,
      for finding low spots on floor and marking height of baseboard
    • circular saw
      6-inch circular saw,
      for ripping back-bevels in trim
    • speed square
      Speed Square,
      for guiding crosscuts made with a circular saw
    • 30-foot tape measure
      25-foot tape measure
    • pencil compass
      Compass (for scribing
    • block plane
      Block plane,
      for tuning the fit of a scribed piece
    • biscuit joiner
      Biscuit joiner,
      for cutting slots in miter joints
    • chalk line
      Chalk line,
      for snapping the lines that establish baseboard height
    • hammer
      Hammer or pneumatic nail gun
    • nailset
      Nail set

    Shopping List

    1. BASEBOARD MOLDING

    2. CAP MOLDING

    3. SHOE MOLDING

    4. 6D AND 8D FINISH NAILS

    5. NO. 10 COMPRESSED WOOD BISCUITS
    (for holding together baseboard miters)

    6. CARPENTER'S GLUR
    (for adhering joints)