Can I get away without several of These layers provided my weather zone? For example, can I use all Roxul, without XPS? Do I Certainly need the drywall?
I don't have lots of place earlier mentioned or under the roof framework for insulation / venting. Would a flash / batt unvented assembly get the job done underneath The one sheathing deck? My insulator has finished A good number of of those domestically.
So a hybrid approach really should be investigated. Dense packed cathedrals with warmside ridged foam to add R, taped, no recessed lighting or other air paths after which you can belt and suspenders... Incorporate venting Despite the fact that there isn't a usual 1" vent path.
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Any residence currently being designed much better than the absolute minimums need to within the quite least not use OSB for roof sheathing. Imo
Put in a layer of closed-cell spray foam against the underside on the roof sheathing, and fill the remainder of the rafter cavity by having an air-permeable insulation. Yet again, this kind of assembly is created to dry to the interior, And so the assembly should hardly ever include things like an inside site polyethylene vapor barrier.
The roof seems to have a layer of asphalt shingles browse this site about the sheathing which has a tin roof about that. The soffits are closed off. The house is way from the crushed route and It really is difficult to get any contractors in existence to work, let alone supply bids so I'm basically on my own.
I think that men and women who compose making codes are involved that, Should the code allows unvented rafter bays to be insulated with cellulose, failures will arise because of sloppy cellulose set up.
You happen to be in weather zone five. I spelled out the minimum R-values for that strategy you will be getting in one of many paragraphs higher than, in which I wrote, "According to .
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I would enormously respect recommendations from industry experts: bite the bullet and possibility of spray foam insulation, or send out the builders back again up on the roof in December to cut ridge and soffit vents?
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I have previously insulated the steep sides of my unvented mansard roof with 6" fiberglass (and I had it inspected), does one endorse I rip that out and use spray or board foam? I've gotten conflicting information on whether or not to deal with it as a wall or even a roof.
You say "You don't need an inside vapor barrier," but In addition, you mention that "You'll need a good air barrier on each side of your fiberglass batts." The latter would develop into an interior vapor barrier not so?