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Ace Roofing Company - Roof Repair & Replacement
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If I am currently not about to get ample below-deck air flow as a result of The lack to acquire enough soffit vent air ingestion, might it sound right to simply skip the endeavor at roof ventilation and perhaps in its place set 1" XPS in place of the vent channel over the underside of the present roof deck? (It's labor intense, but you can reach a fairly tight in shape among the rafters.
Not surprisingly, you can expect to continue to have thermal bridging with the rafters. But you won't have any dampness difficulties.
Thanks for locating the thread earlier mentioned...Be aware that in submit #17, Robert Riversong talks about the "vented about roof". I concur with you that this method deserves some interest for cathedral ceilings.
Martin, I'm grateful for your time and energy, and just after reading several of one's replies, i can see you happen to be passionate about building items ideal. Proper for people, along with the planet. Thank you for Whatever you do!! Ryan Nelson
I manage to recall this but, it has been awhile. Appears to be there are various choices for us here. Thanks for all your enable plus the refresher. Once more I celebrate the useful dissemination of information Within this complex age vs looking for any guide.
Dan Reams, many thanks on your remarks. I also are in snow region near Yellowstone Countrywide Park. I usually have nicely above 3 ft of snow on my cathedral roof. I think the dew stage is often from the snow instead of in the roof. The R value of the snow is frequently near the R price of the roof. This can cause substantial ice dams. A straightforward thermal Examination shows that You can't set a functional number of insulation within the roof to circumvent the ice dams and go the dew place to the roof.
The air leakage that Dana stated would keep your roof dry, but would undermine click this site its thermal efficiency.
Re: the air barrier to become positioned earlier mentioned the pine T&G ceiling and under the foam, would you advise that we use anything which can be both equally an air barrier and also a vapor barrier? Or can it be important to make sure that the product we pick isn't a vapor barrier, so that any humidity that gets in to the roof assembly can dry to the inside?
Martin, Thank you on your reply. Those people posts are the two very useful. I'm getting the perception that SIPs can be carried out well, but is usually defeat in price with exterior rigid foam methods when you've encouraged, with equivalent or much better effectiveness (with emphasis on air-tightness).
I by now sprayed and Slice cobbled 4 inch of closed cell. I will redo the roof upcoming calendar year, but I suppose now it is too company roofing and exteriors late to Imagine about eps/iso on top of roof considering that i currently unvented the attic.
Here is a backlink to a GBA detail for an insulated roof assembly with vent channels above the roof sheathing and metal roofing:
We're going to give it a attempt. Current is a fourteen 12 months aged roof with two" of closed mobile roofing foam with an acrylic elastomeric coating.
Although vented roof assemblies are made to dry to the exterior, unvented roof assemblies are made to dry to the about his inside. That’s why an unvented roof assembly need to never include inside polyethylene.
It appears if one have been to make use of dense pack cellulose inside of a vented cathedral ceiling the vent channel materials need to be rigid more than enough to withstand the tension.