WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Your plan to setup a stack of rigid foam rectangles in Just about every rafter bay is known as the "Slash-and-cobble" approach to insulation. It truly is a way frequently preferred by homeowners, but in no way decided on by insulation contractors.
Most commercial roof assemblies Do not trouble with the fluffy stuff. They only fulfill 100% of the R-benefit requirements to the roof with rigid foam (either EPS or polyiso) and skip the batts totally. That's the way I recommend that you continue.
I've a partial cathedral ceiling during the completed attic of my home in zone four (TN). Just about every slope in the roof is divided around in thirds by 3 different situations: knee walls on the outer thirds, "cathedral" ceiling in the center thirds, along with a vented "attic" in the middle third with a ridge vent - a typical situation with concluded attics, at least around right here. I have a large problem in the summertime with overheating. The insulation isn't Doing work properly mainly because it was inadequately insulated with just R-19 fiberglass batts concerning the rafters without a ventilation baffle or satisfactory soffit venting and only r-19 blown in to the "attic Place". In addition, my upstairs HVAC ducts are operate within the truly hot "attic" House under the ridge. Based upon what i haved realized from numerous content articles below, my planned Option should be to cathedralize all the roof, eave to ridge: set up continous air-restricted website-crafted two" vent channels using foil-faced polyiso board (as instructed in ), setting up constant soffit vents to greatly improve the airflow from soffit to ridge, generating an air-tight ceiling underneath the rafters, and, most importantly, deliver the ductwork Within the conditioned envelope.
I've a matter for blueskin, being a equally an air and vapour barrier, and also it will work as a seal to the screws that maintain all the things down. In reference on the vaulted schematics on this site, it demonstrates vapour/air barrier in addition to insulation, which got me questioning. As good as I am installing elements, no one is perfect, and an air leak may acquire between XPS seams. As soon as ANY dampness receives all the way down to lessen sheathing, it is match over.
You happen to be discover this info here proposing a vented roof assembly. For any vented roof assembly, the code does not demand that any foam insulation be placed in direct Get hold of with your roof sheathing -- Quite the opposite.
It is great to incorporate foam board over the roof deck even with the closed cell foam-board (what sort?) on the interior. Roof decks can't dry to the outside by means of 0.one for each shingles in any case, specially since in zone five it will devote a substantial period of time included in snow/dew/rain with the humidity drive heading inward, not outward.
Ensure that you install insulation that provides at least the minimal code need for ceiling R-worth. Insulation that exceeds the minimum code need is better yet.
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Put in a layer of closed-mobile spray foam in opposition to the underside on the roof sheathing, and fill the remainder of the rafter cavity with an air-permeable insulation. Once more, such a assembly is designed to dry to the interior, Therefore the assembly ought to hardly ever include an interior polyethylene vapor barrier.
Although roof ventilation can help dry out moist roof sheathing, it’s essential to Restrict the flow of water vapor escaping from your household so that the roof sheathing never ever gets damp in the first place.
Most of the information I run throughout seems to be within the cellulose market that promises wind-wash is a giant issue with fiberglass; and from your fiberglass market which asserts that the cellulose team overstates the issue and that towards the extent wind-wash occurs it is admittedly inconsequential.
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Cellulose insulation can retailer lots of moisture. This "humidity buffering" means is cited by some cellulose enthusiasts as An important gain, and indeed this capability can from time to time avert a my sources small dampness dilemma from causing loads of rot.
I are now living in northern Vermont, and I haven't got more than enough expertise with air con to answer your issue about condensation on interior ducts.