When ordering a window be sure to specify a jamb of the correct width. If your walls have 2x4 studs and 1/2-inch exterior sheathing, the jambs should be 3 5/8 inches wide (the extra 1/8 inch allows for imperfections). For a wall with 2x6 studs, a jamb width of 5 5/8 inches is correct. Unpack the window and inspect it before installing. Make sure all the weatherstripping is in good shape and the mechanisms and sashes operate smoothly. Check with your building department to find which method of wrapping the opening is preferred; some departments have stringent requirements. Once the opening is framed, expect to spend about three hours sealing the opening and installing a window and its exterior trim. Also allow time for finishing the interior wall and installing interior trim. Editor’s tip: If you have a brick wall, hire a professional mason to cut the opening for you. The window attaches to the wood framing behind the brick veneer with metal masonry clips. You’ll have to purchase the clips separately and attach them to your window jamb with deck screws. Newer building techniques have specific requirements for flashing a window. In general, the upper pieces should overlap the lower pieces so water can flow downward without seeping in. When installing a window in new construction (left), the building wrap overlaps the self-stick flashing. In a remodel situation (right), a simpler arrangement is often used. Self-stick flashing is installed to the bottom, then the sides, then the top. Finally, small pieces of flashing are applied over the V-shaped gaps at the corners.
