WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Your plan to work with 2-inch-thick EPS as your ventilation baffle will do the job. The EPS is relatively vapor-permeable, so it allows a little bit of outward drying. (In any scenario, should you build a reasonably airtight ceiling, there won't be any moisture Within this assembly that really should escape.)
If you would like attempt a halfway Resolution that may or may not get the job done, you may cut out a number of the drywall near the ridge, and install spray foam insulation about the underside in the roof sheathing, just inside the area near the ridge beam.
Companies of soffit vents and ridge vents ordinarily specify the net free vent area in their goods on products packaging or in technical specs available on line.
I am opening up my property and putting in cathedral ceilings, I just desired to substantiate my plan due to the fact I got 2nd feelings reading Increasingly more about it. My first choice was to go with a vented roof procedure and R38C batts. I read through a good deal about the various approaches and it still appears to me that this is the best. Livint in Atlanta GA we should deal with both of those sizzling humid summers and chilly winters, so humidity Command is an issue, that's why I feel the vented approach could be the best. Anyhow, I am down to the rafters and roofdecking and furred out the prevailing 2x6 with 6" metal studs, so I've about 11.five" for insulation. Mt plan was to create a continuous air flow beneath the roofdeck, my query goes to to make use of baffles, xps board Construct baffles or insect display nailed at furring strips to allow with the airspace.
I am planning a house and we're using cellulose in 2x12 roof rafters, And that i came across an item that appeared terrific. It's an insulated nailbase known as Great-Vent by Hunter Panels. It offers as much as 25.6 R-price in foam insulation (in thicknesses up to six" which include things like a one" airspace and plywood) when giving a cooling vent under the shingles, and straightforward installation to the roofing with the nailbase.
Suitable on! Venting the slope guards the sheathing from staying caught between two vapor barriers/retarders and offers the drinking water a destination to go when There's a leak....a way I will start using promptly. Thank you a great deal Martin.
The plan is to install it (from the inside of your home) about a similar time the drywall is set up. I will instruct my crew to verify there won't be any air pockets in the purlin cavities & no air stream in to the latter.
A. It makes sense for you as it meets your preferences. As that you are mindful, it's not a great approach to insulate your roof assembly. But you may have described it as A short lived halt-gap measure.
If you want to use rigid foam, the best location to set it really is in addition to your roof sheathing, not underneath your roof sheathing.
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Most of the data I operate throughout is apparently from the cellulose market that statements wind-wash is an enormous difficulty with fiberglass; and from the fiberglass field which asserts that the cellulose team overstates The difficulty and that on the extent wind-wash happens it is admittedly inconsequential.
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Dan Reams, many thanks for your personal responses. I also are in snow state near Yellowstone National Park. I generally have properly above 3 feet of snow on my cathedral roof. I think the dew point is commonly within the snow as opposed to inside the roof. The R worth of the snow is usually near the R value of the moved here roof. This may result in enormous ice dams. An easy thermal analysis displays that you cannot place a functional number of insulation in the roof to stop the ice dams and transfer the dew level in the roof.
I have crafted log households within the Yukon Territory in northern Canada for 30 roofing company aberdeen yrs. Most log structures have cathedral ceilings. Most of the roofs We've got crafted are as follows (from The underside up): log purloins, nominal 2" (2x6) t&g decking, 6mil poly, 1 one/two" extruded polystyrene foam, 2x10 rafters on 24" facilities, 7" fiberglass, 2x4 strapping, seven/sixteen OSB, underlayment (fifteen lb paper, 30lb felt, or now we'd even use ice and h2o protect). There could be about an inch of air Area beneath the strapping for the two vertical and horizontal air circulation. All roofs are vented with strip vents at the eaves and vents inside the soffit (2x6 t&g) at the peak at both equally ends. I'd disagree that venting is just not necessary in the event you halt the review airflow on The nice and cozy aspect, for two causes. First it really is very difficult to stop all airflow, Specifically with common conventional techniques (ie chimney and plumbing vent penetrations from the roof) We now have quite a few strategies designed over the years to seal the vb for the eaves and gables, but there remain nail penetrations in the vb. Overall I believe we had very limited seals but a single could hardly ever say airtight.