Can I reuse single-pane steel sash windows?
A client would like to restore some window openings that were bricked-over by a previous owner. The original single-pane steel sash casement windows had been stored, and are in excellent condition. The building department views these “restored” openings as “new” openings, and requires compliance with the energy code, i.e. window U-factor of 0.30 or better. (The default value for these windows is U=1.20 per Table R303.1.3.)
Granted, this is an aesthetic decision. I doubt we can find any newly manufactured window that can match the appearance of the other windows in the house. I don’t believe there is such a thing as an NFRC-rated storm window.
Does anyone have any thoughts as to how I can legally re-use the beautiful old steel sash?
Climate Zone is 4C (Seattle)
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