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Vapor Barrier
Posted by Daniel E. Fall on January 20th, 2004 11:59 AM
In reply to ventilation and vapor barriers by tomh on January 20th, 2004 10:15 AM [Go to top of thread]
Hey Tom,
Good post and I know you mentioned it, but the vapor barrier is a critical step. I'd recommend he remove his foamboard if it isn't glued down and apply a vapor barrier. If it is too much trouble, I'd recommend he apply a vapor barrier, then apply a 2x6 rafter superstructure that forms the soffits, then apply an additional layer of insulation above the vapor barrier. I think this would work. The only difference I might suggest is using 2x6 with hurricane clips (locale) and 2x4 fiberglass insulation. The R-value would double, further reducing temperature differences, and he'd pick up a vapor barrier, and reduce heat loss. Main thing is soffit ventilation, but what about ridge vent for metal. Not sure how those finish at ridge.
The only problem with this plan is it doesn't address the soffit and fascia requirements for venting at the soffit, and building up the fascia, which is an extra pain for a battened roof. Was this post helpful? Yes: or No:
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