How to Install Brick Molding Around Windows

Written by jonah morrissey
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Brick moulding is a decorative exterior window trim often used on brick homes, although it can be applied to homes with other siding treatments. It's different from flat casing window trim because the corner joints are mitred at 45 degrees to form a 90-degree angle. The moulding fits around the window opening like a picture frame. There are several different profiles for brick moulding, so you can select a profile that is similar to your home's existing style of wood trim.

Skill level:
Moderate

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Things you need

  • Tape measure
  • Brick moulding, 96-inch lengths
  • Mitre saw
  • Window and door caulk
  • Caulking gun
  • Box of 10d finish nails
  • Hammer
  • Nail set
  • Wood filler
  • Putty knife
  • 120-grit sandpaper
  • Primer and paint
  • Paintbrush

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Instructions

  1. 1

    Use a tape measure to find the dimensions of the sides and top of the window where the outside edge of the moulding will be placed. Leave room for 1/4 inch of the window jamb to be exposed on the inside of the opening when considering the position of the moulding.

  2. 2

    With a pencil, measure and mark the brick moulding stock that will be fitted on the two sides and top of the window. The measurement will extend to the longest tip of the mitred 45-degree angle at the top of each side and the top of both ends of the top moulding board.

  3. 3

    Cut the two sides to length with a mitre saw. The 45-degree angles should be opposing each other on each side, with the long points on the exterior of the window opening.

  4. 4

    Saw the top board to length by making two cuts at 45-degree angles. The long points are at the top of the moulding. If they were extended from the top of the moulding down, the angles would intersect.

  5. 5

    Using a caulking gun, apply a bead of window and door caulk to the back of each moulding piece. Apply the caulk to the outside bottom edge of each piece of moulding and along the bottom and top edges of the moulding.

  6. 6

    Insert each of the side boards into place. Seat the boards firmly against the jamb and edges of the exterior siding. Position the top board between the two side boards and align the mitre joints. The bottom of the moulding should rest tightly against the sill.

  7. 7

    Nail the boards to the window framing boards about every 6 inches with a hammer and 10d finish nails. Set the nails 1/16 inch below the surface using a nail set.

  8. 8

    Fill the nail holes with wood filler using a putty knife. Allow the filler to dry overnight and sand it flush with 120-grit sandpaper.

  9. 9

    Caulk the seams of the casing with window and door caulk. Wipe the excess caulk away with your fingertip.

  10. 10

    With a paintbrush, prime and paint the brick moulding. Allow the primer to dry at least four hours prior to applying a coat of paint.

Tips and warnings

  • Dry fit the moulding to test your measurements prior to installation.
  • Wear eye protection when installing brick moulding.

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