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WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Your plan to use two-inch-thick EPS as your air flow baffle will operate. The EPS is somewhat vapor-permeable, so it will allow a little bit of outward drying. (In any case, should you Establish a fairly airtight ceiling, there won't be any moisture During this assembly that really should escape.)
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Yet another way to incorporate R-value to the roof assembly is to include one or two layers of rigid foam within the roof assembly — either over the roof sheathing or beneath the rafters.
Is it okay to include peel-and-adhere membrane to select areas in the roof and retain the rest breathable with tar paper?
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Thanks Martin - Now I see why my unique plan for a SIPS envelope was so elegantly easy. It seems like min R-ten sprayed underneath the roof sheathing then a full-fill with the bays with batt / fluffy, plus a vapor sealed drywall lid can get me the 'warm' (unvented) roof system the SIPS was with the get go.
I was skeptical of Bill Hulstrunk's declare that AccuVent baffles could withstand currently being dense-packed within an enclosed cavity.
This assembly was recently designed just south of Portland OR. I posted it two or three weeks back. In this article it truly is again (with the builders comments) I think It is really a reasonably straight forward Construct once you get past the concept of adding provider cavities for your Make.
It is a code violation to setup an air-permeable insulation like fiberglass batts concerning unvented check out this site rafters. It's also a bad thought, because humidity can accumulate on the roof sheathing if you are trying this Discover More Here technique, and you may end up with sheathing rot.
Do you know the original supply for this Picture and if it is achievable to watch other photographs of the fascinating failure.
To comply with the code -- also to adopt a building program that is a lot less risky -- you must either include things like air flow channels or you'll want to set up a layer of spray foam about the underside in the roof sheathing, next the recommendations stated within the article on this website page.
More information on how to insulate an unvented roof assembly is offered while in useful content the posting on this web page.
I'm not a enthusiast of comprehensive peel-and-stick roofs, for many different causes. But your plan will most likely be high-quality. Just make sure that your roof sheathing is dry around the day you put in spray polyurethane foam -- because the sheathing will not be drying very much in either direction right after It really is encapsulated concerning peel-and-adhere membrane and spray foam.
The R price of your Slash'n'cobbled foam + exterior foam must be at least forty% of the center-cavity R value for dew place control for the foam/fiber boundary in zone 5. If It is arising a bit shy of that before adding the outside foam it's actually not a giant offer within the short-term, however, if it may be five-a decade just before re-roofing to boost the foam-R to previously mentioned 40% of the whole It really is worth using vapor barrier latex primer within the gypsum board, or a smart vapor retarder involving the gypsum board & fiberglass.