The R values (resistance to heat flow) of each layer of the assembly are outlined below:
2" x 6" stud wall = 5.5 inches x 3.5 R value/inch = 19.25
2" layers Roxul Comfort Board* = 2 inches x 4.2 R value/inch = 8.4
1.25" layer of Roxul Comfort Board or insulation in service chase = 1 inch x 4.2 R value/inch = 4.2
Total R value = 19.25 + 8.4 + 4.2 = 31.85
*I just looked at the Roxul website and the thickness of the Comfort Board is listed at 1.25", 1.5", 2", 3" so we may have an R-value about 2 higher if we use 2 layers of the 1.25" board.
Also we will probably use HardiPanels rather than HardieBoard sheathing.
3 postings in a 24 hour period. Pretty impressive, huh? I even skied a little bit today. Last day of skiing is tomorrow which always makes you a little sad.
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