Foil-faced polyiso for site-built baffles
First, thanks to everyone here for all of the advice and knowledge I've gleaned as a reader for the past year.
I'm 3 months into construction on a new home (CZ 4A) for my family and recently made a big change... I was planning an unvented roof assembly with spray foam on the underside of the deck, but I became concerned about the difficulty of the application and potential problems now that we're in the dead of winter. I changed the design to a vented roof with cellulose on the ceiling and dense pack cellulose in the walls, but I'm trying to make sure I have the cathedral portions of the ceiling right.
My roof assembly is asphalt shingles | synthetic felt or I/W shield depending on location | 5/8" OSB | 1 or 1.5" air gap | 1" foil faced polyiso | 8.5" dense pack cellulose. The foil face is turned up (towards the roof).
This is how I interpretted the Fine Homebuilding "Roof Venting" article. Did I interpret it correctly? Just want to make sure with the foil faced polyiso being a vapor barrier.
Posted Dec 31, 2012 10:52 PM ET
Edited Jan 1, 2013 6:21 AM ET
Other Questions in GBA Pro help
Do I need to install rigid insulation in the bottom of a walk-in refrigerator before I install tile?
I have a crawl space with cold joints that are inadequately sealed and ooze water. How can I seal them?