What is R-value?
R-value measures the resistance of a window to heat flow. The higher the R-value, the better.
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Comparison chart of full frame R-values of various window technologies: SeriousWindows 300 Series to 1125 Series per NFRC full frame ratings; ENERGY STAR® criteria (U-value = 0.30 – 0.60); Typical dual pane window values from Residential Windows: A Guide to New Technologies and Energy Performance, 3rd Edition, pg 89-90 (U-value = 0.49); Typical single pane window values from Residential Windows: A Guide to New Technologies and Energy Performance, 3rd Edition, pg 84 (U-value = 1.00)
Super-insulating Framing System
Lightweight, suspended film creates multiple air chambers for high R-value, super-insulating performance.
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No Triple Pane
- Up to 30% less weight over triple pane windows
- Less strain on balances and frame materials
- Longer window life
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Passive House Case Study
