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Ace Roofing Company - Roof Repair & Replacement
Austin, TX, USA
https://aceroofingtexas.com
+1 512-836-7663
We are not too long ago installing a great deal of shut cell foam straight to the roof sheathing with excellent final results. Nevertheless I wonder For those who have listened to about what takes place when the inevitable roof leak happens?
Certainly, you can continue to have thermal bridging in the rafters. But you will not have any humidity challenges.
My suggestions could well be to seal the existing vents. If insulation contractors inside your area are putting in 3 to four inches of closed-mobile spray foam previously mentioned the roof sheathing, you don't have to get worried about condensation or humidity accumulation inside your sheathing.
Superb report and discussion. I have a matter about an current unvented attic assembly. The rafters are 2x4's and also the bays amongst them are fully stuffed with shut mobile spray foam. I would like to include two 1in levels of polyiso towards the inside of attic then go over with a vapor open up membrane to airseal the assembly.
A vented cathedral ceiling only is sensible Should the geometry of one's roof is easy. You need a straight shot in the soffits for the ridge. That’s comparatively simple on a gable roof without any dormers or skylights, but When the geometry within your roof is intricate — with functions like hips, valleys, and dormers — it’s unachievable to assure air circulation by means of all your rafter bays.
Your plan will function fine, as long because the layer of rigid foam along with your roof sheathing has an R-price of at least R-twenty. For anyone who is using XPS, you require at least click to read four inches of foam. If you are using polyisocyanurate, you may need at least 3 inches of foam.
Well the roof is happening with the first layer of insulation (on-leading the purlins, beneath the roof sheeting). There appears to be sufficient Area still left from the our website 4" purlin cavity for the next layer of R11 being put in without any modification.
Q. "You say 'You do not need an interior vapor barrier,' but you also say that 'you need a fantastic air barrier on both sides of one's fiberglass batts.' The latter would turn out to be an interior vapor barrier not so?"
The best solution is to deal with your situation from earlier mentioned, by incorporating a substantial level of rigid foam above your existing roof sheathing. You can Establish up the levels oneself, of you can buy SIPs or nailbase panels.
[Editor's Observe: Bill Rose just sent me the following reviews within an e-mail; he involved his permission to article the remarks.]
Whenever they have been venting the dryer inside (code violation?) and possess an hooked up greenhouse I wager the partitions are moldy also. Start from the laundry home with its ideal humidity stage supply "dryer".
Insulated cathedral ceilings are a comparatively modern phenomenon. The fad original site for insulated cathedral ceilings (and good rooms) truly took off while in the seventies and 1980s, when examples commenced showing up like mushrooms after a heat rain.
Ventilation channels are made by putting in a cloth that can manage a separation (an air gap) between the insulation plus the roof sheathing.
A. As I wrote in the short article, "Most rafters aren’t deep sufficient to support the insulation necessary to meet up with least R-values needed by code, especially if the rafter bays include a ventilation channel. ...