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RobertSmalls · 11-30-10, 04:52 PM

U-value is 1/R-value, and, otomh, I'd say R=1 (in those awful USCS units) for single-pane, R3 for a good set of double-glazed, and R13 for SeriousWindows (tm).

11-30-10, 04:52 PM	#6
RobertSmalls Journeyman EcoRenovator Join Date: May 2009 Location: Buffalo, NY Posts: 344 Thanks: 3 Thanked 17 Times in 15 Posts	U-value is 1/R-value, and, otomh, I'd say R=1 (in those awful USCS units) for single-pane, R3 for a good set of double-glazed, and R13 for SeriousWindows (tm).