WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Your plan to put in a stack of rigid foam rectangles in Just about every rafter bay is called the "Slash-and-cobble" approach to insulation. It really is a way normally picked out by homeowners, but in no way chosen by insulation contractors.
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A. If the goal is to setup a good air barrier, then drywall is surely sufficient, as long while you seal all penetrations to stop air leakage. For more on putting in drywall within an airtight method, see Airtight Drywall.
I'm opening up my house and installing cathedral ceilings, I just preferred to confirm my plan since I got next feelings reading A lot more about it. My primary determination was to go with a vented roof method and R38C batts. I study a good deal about the various techniques and it continue to seems to me that Here is the best. Livint in Atlanta GA we need to deal with both equally incredibly hot humid summers and cold winters, so humidity control is a dilemma, that's why I think the vented method is the best. Anyhow, I'm down to the rafters and roofdecking and furred out the present 2x6 with 6" steel studs, so I have about 11.five" for insulation. Mt plan was to produce a steady air flow under the roofdeck, my issue goes toward to employ baffles, xps board Construct baffles or insect display nailed at furring strips to permit for the airspace.
You will be describing a cathedral ceiling that incorporates all probable problems. There was no awareness to air sealing. The worst doable insulation was utilised (fiberglass). Plus the roof assembly is unvented. So it's no surprise that that you are looking at condensation.
I am developing a forensic laboratory built in Massachusetts, and am possessing a complicated time reconciling applicable creating code with my study on the literature pertaining to insulation and roof deck condensation.
I'm not sure when you are interested inside of a making science reply or a code response. From the code perspective, this can be a roof that must be click to find out more insulated to R-forty nine.
The high density fiberglass is so considerably more dense as opposed to medium and minimal density fiberglass that it looks as if it need to decrease the likely for convection within the batts, but at 2 to three periods the cost of medium density fiberglass batts the obtain may be nominal and never worth the added cost. Many thanks for sharing your know-how,
for an unvented building with no insulation higher than the sheathing, how about using Wooden fibreboard among the rafters instantly under and in touch with the sheathing? All gaps amongst the boards as well as rafters crammed with expanding her explanation foam / sealant. You could possibly then cover the rafters with rigid foam to convey your insulation as much as required R amount and decrease the threat for the rafters and sheathing, then put in your airtight drywall beneath this.
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Right up until just lately, developing codes necessary that insulated sloped roofs consist of air flow channels immediately beneath the roof sheathing. A lot of builders however abide by this time-examined method.
We plan to transform to an improperly vented cathedral ceiling to an unvented one particular. Sealing up the soffit vents is really a no-brainer. What is the best strategy to deal with the ridge vent? Thanks!
Thanks for your enter. I see a check out with a structural engineer and 35 sq. of polyiso in my near long run.
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