How does filling a vinyl window frame with foam affect condensation resistance?
I was looking at a Paradigm’s double hung window offerings. It seems like foam injection has little effect on CR of windows coated on surface 2 and 4, but severely decreases the CR of windows coated on just surface 2 or surface 3. Is this an oddity of the CR calculation, or a real world effect?
No Foam: U 0.27, CR 60
No Foam: U 0.25, CR 47
No Foam: U 0.25, CR 46
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