| 摘要 |
A structural frame typically comprised of steel metallic material that is utilized in retrofitting a small basement window in an older residence with an egress window is described that comprises pieces of linear L-channel that has been formed into a rectangular frame. The thickness of the channel is relatively thin permitting an installer to retrofit the smaller window with a larger one that is only marginally less wide without having to cut an opening within the foundation wall that is wider than the original window's steel buck. Excepting the bottom side of the original window's buck, it can be left in place during retrofit. Accordingly, a substantial portion of the foundation wall's load carrying capacity around the window opening is maintained during retrofit eliminating the need for additional reinforcement.
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