WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Using ventilated nailbase panels is a superbly good way to build a cathedral ceiling. Exactly the same rules apply as when using SIPs: make certain that the seams are sealed to get as airtight as you may make them, and make certain that the overall R-worth of your roof assembly meets or exceeds bare minimum code R-benefit requirements.
Like most mansard roofs, your roof is unvented. Your mansard roof has different sections -- the steep sections with the perimeter, as well as reduced-slope area in the middle. Most of these sections should be insulated in a similar way, because these roof assemblies are unvented.
I am a homeowner in Seattle. Have got a newly-framed, vented cathedral ceiling to insulate. Straight bays, 2x12, 24" o/c. The existing plan is to implement batts of some sort inside the bays, get care to air seal the interior surface, prevent penetrations, air seal the vent channel also (bays absolutely sealed), double primary The within area for vapor resistance. I've a couple questions about baffling the vent channel: 1. A few of the creating experts I'm working with truly feel the jury remains to be out on baffles and therefore are recommending leaving the batts open up on the channel except near the vents, assuming the 1-two" air channel is often preserved.
two. It sounds like you will be using steel beams to body your hips. As I am absolutely sure you already know, these metal beams are thermal bridges. All insulation needs to be on the outside aspect in the metal.
The longer that you wait to setup rigid foam above your roof sheathing soon after your rafter bays are stuffed with fluffy insulation, the better the chance that your roof sheathing will accumulate humidity. One or two several years should be no trouble, but I would not extend the workout A lot farther than that.
Does it sound right to spray and Slice and cobble 4 inch closed cell foam/board on underside of sheathing accompanied by fiberglass Within the bays and 1 inch of eps/iso underneath the rafter (to halt thermal bridging) just before ending with drywall? Will I develop a vapor sandwich and greater go away the ultimate EPS and acknowledge the thermal bridging?
When they were venting the dryer inside (code violation?) and possess an attached greenhouse I guess the partitions are moldy as well. Start while webpage in the laundry home with its ideal humidity point source "dryer".
The high density fiberglass is so a great deal more dense than the medium and reduced density fiberglass that it seems like it should reduce the opportunity for convection within the batts, but at 2 to three next periods the cost of medium density fiberglass batts the attain might be nominal and not worth the additional cost. Thanks for sharing your knowledge,
[Editor's Notice: Bill Rose just despatched me the next opinions in an e-mail; he included his permission to publish the comments.]
I believe that Monthly bill Rose is correct: all of these failures contain dampness that is carried by moving air. They're not diffusion failures. Should the rafter bays truly are adequately dense-packed -- a big if -- the prospect of air motion is very low.
Any property being crafted a lot better than absolutely the minimums really should at the really least not use OSB for roof sheathing. Imo
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The roof was shingles on t&g pine decking. Insulation was appropriate up in opposition to that pine decking due to the fact seventy seven and is particularly 2014. Things appears like it absolutely was put in yesterday. Not a bad location any place, no roof vents fully unvented roof.