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One of the pleasant options available when you replace an old window, is to replace it with an attractive Garden Window. Each Garden Window is factory assembled with a structural 1 ¼" laminated headboard, seat board, and side joints. Because they are factory pre-assembled, they can be mounted as a unit. However, installation should only be done by removing the old window frame along with the old sash.

The Garden Windows designed for replacement, come as an integral unit, which includes head and seat boards, all the windows, complete in a sealed unit ready for installation. If the top and bottom are not scaled with coated aluminum to weatherproof, it is advisable to do so before installation. First, rest the inner edge of the projection on the sill, tilt the window unit inward until it is about halfway inside. The sill will now be holding the weight of the unit. Have one of the helpers go inside to help steady the window as you continue to push it through the opening.

If there is no existing exterior support, use pre-fabricated braces 2 x 4 studs, pre-cut to the anticipated length, to support the outer edge of the projection as it is eased outside. Work the unit outside until the edges of the sideboards, headboard, and seatboard are flush with the interior wall surface. Secure the outer edge of the projection with adequate support from the temporary braces. Using a level, be sure that the window sits plumb and square in the opening. Using #10 or #12 finish nails, countersunk in the sides, head and rear gently anchor the window unit in the opening using shims under each nail. Check the plumb, square, and level again and adjust as necessary. If no support brackets are ordered with the unit, they can be fabricated from pressure threatened lumber. They can then be covered with pre-finished aluminum capping stock or form the base for an enclosed support.

Outside the house set a knee brace or angled support under each mullion of the window. Place the long leg of the brace against the house and drill pilot holes through the brace into studs in the wall. You can show where they are. If there are no studs in a proper position, move the brace left or right (within reason) until it lines up correctly. The idea is to support the window under the mullions as close as possible yet maintain a balanced symmetrical look to the braces. If they are to be covered, the symmetry of the support is less important. Fasten the support bracket using a 3/8" lag bolt that is long enough to penetrate into the stud at least 2". Fasten the brace to the underside of the Garden Window with a wood screw of sufficient length to anchor into the seat board but not puncture through.

Once the new window has been supported and sealed on the exterior the interior molding can be applied. Install insulation into the space between the sideboards, the headboard and the rough opening. Using the casing install the trim on all four sides. Using wood putty, fill and sand the mounting screw holes in the side, head, and seat boards. Finish the headboard, seat board, and side jambs with a high-quality oil based paint or stain. Do not use water based paints and stains.

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