In a cathedral roof ceiling, with rafters or purlins or both visible and decking of some sort on top of those, how does one handle insulation? I found one example in the Fine Homebuilding compilation "Timber-Frame Houses". On page 94 there is a roof cross section that shows a 6x15 principal rafter, with sheathing on top of that, then 2x10s with fiberglass battens between, then more sheathing then shingles. Is this pretty standard? I was thinking of something similar except with blown-in cellulose insulation between the 2x10s instead of fiberglass battens. Code here requires R-30 which comes out to about 9" of cellulose. I'd be interested to hear how others have handled insulation - especially blown-in cellulose - in cathedral roof situations.
Miles
