1 Opening Preparation | Window Frame Depth minus 1/4" | ||
I. Install wood blocking around the entire opening. | Flashing Tape |
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The blocking must be the same height as the |
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| Wood Blocking | ||
existing aluminum window frame. The blocking must | 1J | ||
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extend to the interior far enough to provide full |
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support for the sill of the new window, however may |
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extend as far to the interior as desired. Set blocking |
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in sealant against drywall return to prevent air |
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infiltration. |
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J. Apply sill flashing tape. Cut a piece of flashing tape |
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6" longer than the existing aluminum frame width. |
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Apply the tape bottom over the wood blocking so |
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it overhangs 1” into the first sill cavity of the existing |
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aluminum frame and goes up 3" each jamb. |
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K.Cut treated wood or PVC filler to loosely fit the sill cavities in the existing aluminum frame. This filler material will help support the weight of the new window, but should not prevent water drainage. The depth of the filler should be the same height as the tallest leg of the aluminum frame. Cut the sill filler to fill the entire length of the sill in both cavities. Cut notches in the sill filler to correspond with the weep holes of the existing aluminum window frame.
L. Install the wood filler into the existing aluminum |
frame. Insert the sill filler with the notches over the |
existing window weep holes. DO NOT block any |
Window Frame Depth minus 1/4"
Flashing Tape
weep holes in the existing window. |
Wood Filler
1L
Wood Blocking
1L
M.Install and level sill spacers. Place 1" wide x
1/2" from each side and 1/2" back from the interior surface of where the new window will rest. Spacers are also required below mullions and at screw anchor locations.
Note: The depth of the shim should be equal to the window frame depth minus 1/2". Cut the shim to this dimension. Place the exterior edge of the shim flush with the exterior of the existing window. Improper placement of shims may result in bowing the bottom of the window.
1M |
1D |
