WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
The air leakage that Dana pointed out would maintain your roof dry, but would undermine its thermal general performance.
As an example that a specific constructing apply brings about a twenty% failure price. That apply might be thoroughly unacceptable to builders, who don't desire callbacks or complications. But that practice would nevertheless lead to eighty% of consumers currently being pleased.
"R-19 batts are very air permeable, and on long unobstructed rafter bays you have very a stack impact. It doesn't take a enormous volume of air leakage to deliver some drying there. Also, In case the batts are unfaced or kraft-confronted, the drying toward the interior can be significant.
I have an unfinished attic, with cathedral ceiling, no insulation presently. in five-10years we are going to be incorporating dormers, but Meanwhile i want to add insulation and drywall in The best, most reversible/salvageable method. My plan is to hang two levels of 2 inch polyiso under the rafters, taped with staggered seams leaving the rafters vacant, so primarily a vented assembly. I have extra blocking to the ground joists and can make the polyiso steady inside the knee walls. I assumed I might include furring strips on top of the insulation then hang drywall, thinking that the furring strips would build an airgap, permitting the foil to work as a radiant barrier.
Q. "I'm asking yourself if I must furr out the rafters for getting the specified thickness of spray foam, or if installing a number of inches of polyiso foam into the underside of the rafters, after the spray foam, could function?"
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I am sorry to be the bearer of undesirable news, even so the sections learn the facts here now of roof that are insulated with six inches of fiberglass and inside polyethylene weren't insulated the right way. In These sections, the roof sheathing is at risk of my latest blog post humidity accumulation and decay.
Thorsten Chlupp is in a very A lot more difficult local climate and he seems to be performing great with easy free fill over the attic flooring....of course He's using "ample" amounts (cellulose galore)and he has baffles near the soffit.
We experienced a Zip Roof set up plus a metal Roof placed over it. The roof assembly will not be vented and taped all around the soffits. Preferably I would prefer to pack the complete cavity with blown cellulose. This string of conversations is giving me pause for believed.
I am a homeowner with cathedral ceilings that were being additional through transforming and growth of my household during the late 90s. Only the ridge beam is exposed. The rest of the ceiling is covered with drywall. From the a long time There have been some condensation leak down the side with the ridge beam on some mornings in March/April.The home is about 4 miles through the coast in Southern Califonia, so zone Source 3b. There are actually 4 recessed lights in the ceiling to the facet in the beam that will get the condensation, but In addition there are lights around the aspect that is usually dry. There is absolutely no air-con in the house. Heat is utilized in the night time only about a dozen nights a year, not over the condensation. Usually the Home windows are open. It seems the condensation demonstrates up on mornings when there's no marine layer (no clouds in the morning) and the temperature heats up relatively early after a incredibly great night. The situation ceiling faces east/west plus the condensation is over the east going through side of the beam. The roof is black asphalt shingle. I know that there's no caulk/sealant involving the side with the beam as well as spot exactly where the drywall butts towards it, so You will find a little air hole there.
Like Doug's design and style, the main target is on developing a high perm layer for drying to the exterior, that will continue to allow for venting while blocking wind washing inside the fluffy things.
You wrote, "the rafters remain exposed," but I am undecided what you signify by that. Do you've kraft-confronted batts involving the rafters, with the kraft dealing with continue to obvious?
I'm guessing that neither of those aspects just suits your preferences. But as I observed earlier, If you need a custom depth, you most likely require to hire an architect or an engineer. Very good luck.