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Ace Roofing Company - Roof Repair & Replacement
Austin, TX, USA
https://aceroofingtexas.com
+1 512-836-7663
You're describing a cathedral ceiling that incorporates all feasible blunders. There was no consideration to air sealing. The worst feasible insulation was utilized (fiberglass). And the roof assembly is unvented. So it's no surprise that you might be observing condensation.
The very first vent baffles to hit the industry — the basic Appropriate-Vent of the 1970s and ’80s — were inexpensive, flimsy things made from thin polystyrene. Polystyrene baffles have many shortcomings: staying skinny and flexible, they're able to’t resist the pressures from dense-packed cellulose or blown-in fiberglass; they don’t ventilate the complete width of the rafter bay; and as typically installed, they allow air to leak out the best from the insulated assembly.
I am designing a residence and we have been using cellulose in 2x12 roof rafters, and I found an item that looked good. It is an insulated nailbase called Great-Vent by Hunter Panels. It offers approximately twenty five.six R-value in foam insulation (in thicknesses up to six" which include a one" airspace and plywood) although giving a cooling vent beneath the shingles, and straightforward set up to the roofing with the nailbase.
Vitality codes establish minimum amount R-price prerequisites for roofs and ceilings. There are plenty of probable code compliance paths; most builders choose the prescriptive path, which sets forth minimal R-values for roofs and ceilings in a prescriptive table.
Magic bullet standing will not be achieved. It's a style and design for your minimal slope roof. It's very much along the strains of Doug McEvers utilization of high perm fibre board to generate vent channels higher than dense packed cellulose.
You will be in local weather zone 5. I defined the minimal R-values for your technique you're having in among the paragraphs higher than, in which I wrote, "In accordance with .
As developing scientist Bill Rose has demonstrated, code prerequisites for roof venting had been by no means depending on study or scientific principles. In a very well documented JLC
Re: the air barrier for being placed higher than the pine T&G ceiling and underneath the foam, would you recommend that we use a thing which is the two an air barrier as well as a vapor barrier? Or is it important to make sure that the item we select isn't a vapor barrier, so that any humidity that receives into the roof assembly can dry to the inside?
Whether you choose to make it vented or unvented, get the main points ideal — simply because every single cathedral ceiling offers opportunities to produce significant faults
If you’re creating a new dwelling, however, listed here’s my suggestions: in order to insulate with cellulose, help it become a ventilated roof by including air flow channels less than your roof sheathing. Leaving out the ventilation channels is risky.
I'm a homeowner in Seattle. Use a freshly-framed, vented cathedral ceiling to insulate. this Straight bays, 2x12, 24" o/c. The present plan is to implement batts of some kind while in the bays, choose care to air seal the interior area, stay away from penetrations, air seal the vent channel far too (bays fully sealed), double prime The within surface area for vapor resistance. I have a pair questions about baffling the vent channel: one. A few of the constructing professionals I am Performing with truly feel the jury remains to be out on baffles and they are recommending leaving the batts open for the channel besides near the vents, assuming the one-2" air channel is usually taken care of.
You should consult with an roofing company boise electrician about the best way to provide your ceiling electrical packing containers. There are several achievable alternatives -- some noticeable from the interior, and some concealed by The brand new foam.
The high density fiberglass is so considerably more dense than the medium and low density fiberglass that it seems like it should really lessen the potential for convection within the batts, but at 2 to 3 moments the cost of medium density fiberglass batts the get could possibly be nominal instead of worth the extra cost. Thanks for sharing your abilities,
The edges roofing company blog on the roof are lined with asphalt shingled (GAF Slateline to become specific). It seems like I ought to pull down the fiberglass and have it spray-foamed before I drywall.