"effective" R-value for spray foam insulation?
I've been in contact with some contractors for spray foam insulation for the underside of a new construction roof. Although they say the foam has an R-value of 7 per inch, they say the 'effective' R-value is double that because there is no air movement within the material. Thus, I don't need 7+ inches to get R50, I'll only need 3.5-4 inches. Is this true?
Don't ask for ''inches of foam" ask for "R50".
Run this by your architect and local building permit office.
If the contractor signs up for R50, then there are legal issues if R50 is not installed.
|All times are GMT -5. The time now is 11:20 AM.|
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.