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Cole_Robbie · March 24, 2016

I was wrong, the inflated layer is R1.7:
http://greenhousegab.com/consider-the-r-value/

Your twin wall poly carb, according to that site, is either R1.5 or R1.7

Nothing clear has an r-value that is high. The most expensive glass is r2.0 - everything else is less.

March 24, 2016	#6
Cole_Robbie Tomatovillian™ Join Date: Jun 2012 Location: Illinois, zone 6 Posts: 8,407	I was wrong, the inflated layer is R1.7: http://greenhousegab.com/consider-the-r-value/ Your twin wall poly carb, according to that site, is either R1.5 or R1.7 Nothing clear has an r-value that is high. The most expensive glass is r2.0 - everything else is less.