WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
ok, so I'm a little apprehensive reading this thread. I have a terrific home that is paneled along with the rafters, which might be 4x8, And that i installed sloped cans and was gonna insulate and complete ceilings. My primary reason of executing This really is that the roof is straight on the beams and it receives really hot in the summertime, Winter season not a lot of issue as I are now living in San Diego and temps almost never dip down below freezing.
A. You will find a code requirement to get a vapor retarder in certain types of assemblies, but there's no necessity for just a vapor barrier. Your layer of rigid foam is already a vapor retarder. No even more vapor retarding layer really should be mounted.
A. Should your goal is to put in a great air barrier, then drywall is absolutely satisfactory, as long while you seal all penetrations to stop air leakage. For additional on putting in drywall in an airtight method, see Airtight Drywall.
As outlined by area R806.3 on the 2006 Intercontinental Residential Code (IRC), “No less than a 1-inch Area shall be supplied involving the insulation plus the roof sheathing and with the location from the vent.” Such a vent Area may be made by setting up one inch by one inch “sticks” within the upper corners of each and every rafter bay, followed by rigid cardboard, thin plywood, OSB, fiberboard sheathing, or panels of rigid foam insulation.
My residence in-built sixty three listed here in Ohio incorporates a cathedral ceiling with no air flow. The truth is there many cross-supports functioning perpendicular to this content the principle joists along with other framing components that would make this unfeasible. So I need to make it a powerful unvented roof. Fifty percent on the roof has 2x8 joists and the other half has 2x12s. At this time There exists a membrane masking (rubber) that's worked perfectly for more than 20 years but is showing signs of deterioration and may possibly have to have replacing quickly. Obtaining carried out remodeling on The within and going for walks on the roof I realize that a great deal of the sheeting needs to get replaced along with the little insulation that is there now. We've experienced condensation troubles prior to now so I now there are actually air infiltration and bridging issues.
Based on section R806.five in the 2012 IRC, “Unvented attic assemblies (Areas concerning the top-Tale ceiling joists and the roof rafters) and unvented enclosed rafter assemblies (Areas involving ceilings that are applied on to the see this website underside of roof framing members/rafters along with the structural roof sheathing at the highest of your roof framing associates/rafters) shall be permitted” as long as many circumstances are fulfilled.
My sense is that if we are anxious about air leakage compromising the insulation's performance, vent channels are problematic.
My knowledge as I look at here now read through this blog is that I would not have to fret about producing an air channel above the sheathed portion as a result of rigid foam.
I need to ponder Should the failure while in the Image would have occured In case the hip and ridge was vented and every thing else exactly the same?
Simply because a roof assembly doesn't follow the guidelines founded from the developing code or suggestions of creating scientists doesn't signify the roof has
Have you been thinking the 'flat' vented cavities won't supply the assembly with an exhaust path for humidity?
We plan to transform to an improperly vented cathedral ceiling to an unvented a person. Sealing up the soffit vents is usually a no-brainer. What is the best technique to deal with the ridge vent? Thanks!
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Looks like you have the framing and roofing in place. Your options are explained during the posting earlier mentioned--it is possible to add venting by putting in baffles underneath the sheathing to hold back again the insulation, or it is possible to set up at least R-20 of air impermeable insulation.