Thermaproof windows

The ThermaProof line of energy-saving windows for both commercial and residential construction offer true, full-frame R-values of R-5 to R-11, the company reports. From Serious Materials, the windows combine an AlpenGlass+ insulating glass package with a variety of fully-insulated framing for high insulation performance across the full-frame, not just measured at center of glass, the manufacturer notes. The line includes single-hung, double-hung, gliders, casement, gliding doors and swing doors as well as curtain wall and storefront systems.