How to calculate R-value of attic insulation?
Hi there –
My wife and I are in the final stages of completing a super-insulated house near Ottawa, Canada. I have requested that the attic be insulated to R-80 with blown cellulose. While in the attic yesterday installing some cabling, I had a chance to measure the cellulose. It was installed about a month ago, it is very even, but is only 16″ in depth, more or less.
From what information I have cobbled together from the net, this corresponds to about R-60. Am I correct or I have I not accounted for something (such as settling)?
Thanks in advance.
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