That looks quite appealing: choose R-thirty on the underside with the deck at our house working with a combination of fiberglass batts and XPS as I explained previously mentioned, then include an additional R-10 (two" XPS) on the best side whenever we tear down and re-roof? Sadly that sounds like It is really too straightforward.
I am unsure what to do with regard to the electrical for the existing fan, and with the not-nonetheless-set up but Significantly preferred keep track of lights. Within the old roof, the fan's electrical supply ran in addition to the T&G ceiling, and was covered by what seemed like electrical tape, then by a 1/2" layer of seem insulation board, then with the felt and shingles.
I used to be skeptical of Bill Hulstrunk's declare that AccuVent baffles could stand up to becoming dense-packed in an enclosed cavity.
  Cathy experienced numerous close friends, was passionate and gifted with a chance to relate to people of all walks of daily life.  She beloved cats, possessing adopted quite a few throughout her existence, and it broke her heart when she had to find residences for her ultimate 3 cats (Prissy, Boots, and Cuddlebug) just before returning to her residence space in early 2017 to reside in assisted living.
Thanks with the input. I see a pay a visit to with a structural engineer and 35 square of polyiso in my in the vicinity of long run.
The most effective Resolution is to handle your situation from previously mentioned, by adding a significant level of rigid foam over your existing roof sheathing. It is possible to Make up the layers on your own, of You should purchase SIPs or nailbase panels.
Appears like you might have the framing and roofing in place. Your options are explained during the short article higher than--you may increase venting by setting up baffles under the sheathing to hold back again the insulation, or you may install not less than R-20 of air impermeable insulation.
Does it seem sensible to spray and Slash and cobble four inch closed mobile foam/board on underside of sheathing followed by fiberglass In the bays and one inch of eps/iso beneath the rafter (to halt thermal bridging) ahead of ending with drywall? Will I make a vapor sandwich and improved depart the final EPS and settle for the thermal bridging?
Perhaps the strategy to go should be to accept 4" of froth above the cathedral ceiling, as an alternative to eight" of froth, instead of go on the foam in excess of the vented attic. There'll be a Odd jog while in the roof line where by the foam starts, but it will largely only be obvious from the back again of the home, not from the street.
This post was really informative and looked as if it would give a large amount of advice on cathedral ceilings. But what what my best storm? The house is 30 several years previous (80's) and im absolutely sure the ceiling is just not air limited. I choose to do some thing this summer months/slide to try to fix these leaks but I am worried that whatsoever I do wont perform and will be described as a waste of cash, In particular considering the fact that I havent heard about a strong Alternative.
Even more tips here so, two other regions of facet-roof have already been dry walled more than with fiberglass and also a plastic sheet -- the toilet closet and also the hallway. I'm frightened to inquire but should I open Those people up once more?
I have an unfinished attic, with cathedral ceiling, no insulation right now. in 5-10years we will be including dormers, but Meanwhile i wish to add insulation and drywall in the simplest, most reversible/salvageable way. My approach is to hang 2 levels of 2 inch polyiso underneath the rafters, taped with staggered seams leaving the rafters empty, so essentially a vented assembly. I've extra blocking to the floor joists and is likely to make the polyiso constant while in the knee walls. I thought I'd personally insert furring strips on top of the insulation then cling drywall, thinking that the furring strips would build an airgap, permitting the foil to work as a radiant barrier.
Joe Lstiburek: "A vented attic, where insulation is placed on an air-sealed attic floor, is Among the most underappreciated constructing assemblies that we have within the background of developing science."
Thank you on your tips, Martin. Green Making Advisor has actually been the top for answering particular issues I've experienced from the basement every one of the method to the roof. I wouldn't have the ability to Make my very own dwelling solo like this devoid of you and various visitors serving to me out with information.