Remove the old window
Outside the house, use a razor blade or chisel to cut away the caulk and sealant around the window to be removed.
Inside, use your knife to score the edges of the casing around the window, which will prevent the paint and plaster tray from pulling away when you remove this trim. Use a ratchet to lift and remove the inner casing.
With the trim removed, along with any insulation molded into the gap between the window and the house frame, you’ll see the nails or screws that hold the window in place. Use a reciprocating saw or hacksaw with a metal cutting blade to cut all of these attachments.
Remove the window by having one person push from the inside, while one or two helpers on the outside catch the window as it comes free. Even small windows are heavy, be careful and be prepared. If the window frame height is low enough, put sawhorses or scaffolding to “catch” the window when it comes out.
Install the new garden window
Before installing the new garden window, find and mark the center of the window. Also determine the height of the garden window, which may differ from the old window and rough opening and mark a level line across the opening.
If the rough opening is higher than needed, it is generally better to install the new window to the top of the opening and fill in below it. This will help maintain the home’s exterior defenses against rain and water runoff, and any side shift will be less noticeable below the window than above.
If necessary, add spacer blocks to the rough opening board to raise the new window up to the grade line.
Fit an aluminum drip cover over the window opening even if the manufacturer claims that the garden window does not require it. Tip the drip cover under the side grooves so that the drip edge extends over the window.
Lift the garden window up to the stand and place it in the opening. Make sure the window is level, vertically plumb and centered in the opening.
Insert tapered wood shells between the window and the house frame to position the window properly without forcing or bending the window sides. Double-check the window configuration in all dimensions, then screw through the window sides and shims into the house frame.
The trim window from the inside out
Outside the window, mounting brackets provided by the manufacturer are installed and attached to the house casing or framing for additional support.
Cover up any gaps in the housing that cover under the window and install siding to match the original.
Measure, cut and install the garden window exterior trim according to the manufacturer’s instructions.
Caulk around the window to complete the job on the outside.
Inside, fill the gap between the window frame and rough opening with insulation to prevent drafts.
Measure, cut and fasten the inner casing with subsequent nails. Use wood filler to hide the holes and paint or stain the wood as needed.
Install any clips or fasteners that are available to hold the window in the household window. Add plants and enjoy the view.
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