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pinhead · 09-22-11, 11:31 AM

I have been looking a bit on the internet and cannot find a graph for the relationship R vs Pressure of air. I am renovating my very old house and was pondering putting a vacuum layer, almost against the exterior finish. I understand a perfect vacuum would have an infinite R Value, and I read that closed air at 14.5 PSIA (1atm) has about R-1 / Inch. If I can only get my retrofit vacuum panels to 7.25 PSIA would I be looking at R-2/inch, R-10/inch, ...?
Anyone have some interesting thoughts?

09-22-11, 11:31 AM	#1
pinhead Helper EcoRenovator Join Date: Jul 2011 Location: Ontario, Canada! Posts: 41 Thanks: 0 Thanked 5 Times in 5 Posts	Air: R (RSI) vs Pressure I have been looking a bit on the internet and cannot find a graph for the relationship R vs Pressure of air. I am renovating my very old house and was pondering putting a vacuum layer, almost against the exterior finish. I understand a perfect vacuum would have an infinite R Value, and I read that closed air at 14.5 PSIA (1atm) has about R-1 / Inch. If I can only get my retrofit vacuum panels to 7.25 PSIA would I be looking at R-2/inch, R-10/inch, ...? Anyone have some interesting thoughts?