How to Install a Window With Brick Facing

Clean out the old foam insulation and caulk from the rough opening to smooth out the sides, top and bottom. Place a putty knife over any stuck-on pieces and hit the putty knife's handle with a hammer.

Lay the new window face down on a work bench. Bend the side flanges out at a 90-degree angle from the window. Insert a tube of silicone caulk into a caulk gun. Cut off the tube's tip with a utility knife. Spread a continuous 3/8-inch bead of caulk down the center of each flange.

Lift the window into place from outside. Go inside and lay a level on the bottom edge of the window. Push wooden shims underneath the window's low end to bring it up level with the high end. Place the shims between the window's bottom edge and the rough opening. Keep the shims near the window's corner.

Go back outside. Hammer nails through the flanges to secure the window to the rough opening. Space the nails 12 inches apart and keep them at least 3 inches from the corners. Spread a bead of caulk over the window's flanges.

Measure the length and depth of the gap between the window's edge and the brick siding on both sides of the window. Transfer these measurements to two 2-by-4-inch boards. Cut the boards to the appropriate lengths using a circular saw, then rip the boards so they will fit flush in the gap.

Place each board in the appropriate gap and nail them into place. Spray foam insulation around the exterior edges of the 2-by-4-inch boards and along the top and bottom edges of the window.

Measure the window's length and width. Transfer these measurements to window trim pieces. Cut the trim pieces at 45-degree angles using a miter saw, so they fit together and form a rectangle around the window. Run a bead of caulk down the back of each trim piece before putting it in place next to the window and securing it in place with a pneumatic nail gun and finishing nails. Run a bead of caulk over the gap where the trim pieces meet the brick.