Cost diference when insulating to the same R-value; Closed Cell Polyurathane vs Fiberglass
Closed cell Polyurethane is more expensive/R-value than Fiberglass, but as a whole when a building is insulated to the same standard, how much more expensive is the foam? I would like to build a double wall with 2x4s that is 7.5 inches wide and insulate with spray-in polyurethane foam…the r-value of the wall would be 45 or maybe a bit more. To get a similar insulated wall with the less expensive fiberglass, the wall would have to be nearly 15 inches thick. Given the extra costs of thicker walls, wider foundation, etc., what is the cost difference in this situation with a 2,500 sq’ house?
I live in cold climate, Central Mountains of Idaho @ 5,000 ft elevation where the growing season is only 69 days when the temperature is not below freezing.
Is the cost difference negligible when the cost of the entire home is considered?
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