The roofing company truck wraps Diaries
Ace Roofing Company - Roof Repair & Replacement
Austin, TX, USA
https://aceroofingtexas.com
+1 512-836-7663
Q. "I am pondering if I must furr out the rafters to acquire the desired thickness of spray foam, or if putting in a couple of inches of polyiso foam to your underside from the rafters, once the spray foam, could get the job done?"
Can we (does the code enable it)? Will it make functional sense? Are there pitfalls on account of our climate? How may We have now to switch that to suit it to out circumstance?
Many thanks for locating the thread higher than...Observe that in put up #seventeen, Robert Riversong talks about the "vented in excess of roof". I agree with you that this technique warrants some notice for cathedral ceilings.
Electrical power codes build minimal R-price necessities for roofs and ceilings. There are lots of doable code compliance paths; most builders choose the prescriptive path, which sets forth minimum R-values for roofs and ceilings in the prescriptive table.
4. Once you have R-twenty or R-25 of rigid foam in addition to your sheathing, it is possible to safely insulate underneath your sheathing with Nearly virtually any insulation you need to use to convey your insulation approximately least code needs.
Dan Reams, thanks for your personal comments. I also are now living in snow state near Yellowstone Nationwide Park. I often have well over 3 toes of snow on my cathedral roof. I feel the dew stage is often while in the snow instead of during the roof. The R value of the snow is commonly near the R value of the roof. This may lead to massive ice dams. A straightforward thermal analysis displays that You can not set a realistic degree of insulation within the roof to stop the ice dams and shift the dew point into your roof.
The plan: Section A: I discovered one" Dow rigid foam backed 5/8CDX for the same price tag as being the bare CDX, And that i plan to double it up just roofing company bakersfield like a SIP, setting up the bottom sheet foam side up and the subsequent sheet on prime (staggered certainly) with the foam facing down, giving me two" of insulation involving the plywood.
To prevent moist inside air from getting in touch with cold surfaces near the ridge, you need a genuine air barrier and an actual insulation layer. The ideal way to fix this issue is to show the rafter bays -- both from previously mentioned or under, it's your preference -- and pull out the fiberglass insulation. Put the fiberglass in a very dumpster. Then fill the rafter bays with spray polyurethane foam.
Need to I use airtight baffles or not, I do not see a additional hints way to have moisture escaping inside of a assembly with airtight baffles, fiberglass and xps on The within, it doesn't matter what the dew stage will be inside this assembly And maybe develop condensation that are unable to evaporate without air flow.
In the event you’re creating a new dwelling, on the other hand, right here’s my assistance: if you wish to insulate with cellulose, enable it to be a ventilated roof by together with ventilation channels under your roof sheathing. Leaving out the air flow channels is risky.
Your proposed assembly is often a code violation. If you'd like an unvented roof assembly, you should keep the roof sheathing heat with spray foam or rigid foam. Cellulose insulation is classified as an air-permeable insulation and can't be used in such a roof assembly.
Positive the instance revealed is to get a minimal pitch (not flat) roof. But modify it to your pitched roof lower than six-twelve and the details remain a fantastic technique (I roofing company barrie think).
The high density fiberglass is so a great deal more dense as opposed to medium and reduced density fiberglass that it looks as if it should really reduce the probable for convection within the batts, but at two to 3 periods the cost of medium density fiberglass batts the acquire may be nominal and not worth the extra cost. Thanks for sharing your experience,
Absolutely sure it's loads of issues. It looks like fewer issues that the element posted as example in the blog previously mentioned and utilizes no foam... That is a "biggie" for me.