Q. "You say 'You don't want an interior vapor barrier,' but In addition, you declare that 'You'll need a great air barrier on each side of your respective fiberglass batts.' The latter would turn out to be an inside vapor barrier not so?"
I'm building a dwelling and we have been making use of cellulose in 2x12 roof rafters, and I came upon a product that seemed good. It truly is an insulated nailbase called Awesome-Vent by Hunter Panels. It provides up to 25.6 R-benefit in foam insulation (in thicknesses around six" which contain a one" airspace and plywood) although supplying a cooling vent beneath the shingles, and straightforward installation for your roofing Along with the nailbase.
A. In the event your intention is to install a good air barrier, then drywall is undoubtedly enough, so long as you seal all penetrations in order to avoid air leakage. For more on setting up drywall within an airtight fashion, see Airtight Drywall.
In the final summary it reads: "In case you are using fluffy insulation, you'll need two air barriers: 1 under the insulation, and a person previously mentioned the insulation.
I choose to adequately insulate my cathedral ceilings and was wondering to spray two inches of shut mobile foam to sheathing, then fill with dense packed cellulose. I am pondering if I'm able to attach craft paper and pine paneling for the 2x8 rafters after which you can fill the bays with cellulose.
Insulated cathedral ceilings are a relatively the latest phenomenon. The craze for insulated cathedral ceilings (and excellent rooms) really took off from the nineteen seventies and eighties, when illustrations started showing up like mushrooms after a heat rain.
No matter if you select to make it vented or unvented, get the main points suitable — simply because every single cathedral ceiling provides prospects for making major problems
That said, if your neighborhood making inspector approves of the prepare, and When you have loads of time with your fingers, and you simply are effective at doing a meticulous occupation of air sealing, you can go ahead and consider the Reduce-and-cobble method.
I agree along with you: I'd like to see more info on this concern. I'm not aware of any failures that have occurred in correctly dense-packed unventilated rafter bays.
I feel that you have to write-up a sketch. I am unable to visualize what you are referring Click This Link to from the description. If you need to put in an HRV in your attic, why do you need to set up a water resistant stucco roof above some sort of EPS box? Isn't really your attic currently dry? Most attics have roofs.
I've a mansard roof with steep sides with gables, and an almost flat top having a rubber roof. There are no vents, it has not been insulated before I begun focusing on it and also have 2 issues:
The underside line is usually that, so long as your roof sheathing is pretty dry once the roof is shut in, you have to be wonderful, even with out outward drying. I'd personally go ahead an install the peel-and-adhere membrane during the valleys and in the eaves with out worrying.
If I adjusted my venting detail into a internet site created design, among the rafters, as with your many weblogs on this topic, my air barrier would need to changeover back within just before it got for the sloped roof; incredibly cumbersome within the gable partitions. Not likely guaranteed how I might try this.
Q. "The air barrier would be to be placed over the pine T&G ceiling and under the foam. Would you advise that we use a thing and that is equally an air barrier and also a vapor barrier?