Any home becoming developed much better than the absolute minimums should really in the extremely the very least not use OSB for roof sheathing. Imo
I happen to be making use of rigid breadboard design and style expanded polystyrene from the rim joists and considered the identical can be set under the sheathing in between the rafter bays, and with any gaps sealed that has a urethane spray foam such as Fill and Seal. Is there a quality that makes spray foam satisfactory and rigid foam unacceptable?
Transforming the Intelo membrane to glued & taped OSB or Plywood that has a assistance cavity under fabricated from framing lumber does make the assembly a lot easier to build.
two. When you set up fiberglass batts, air boundaries are a great deal more significant than vapor Handle. You will need a good air barrier on each side within your fiberglass batts.
Lastly, I kow the recessed lights is horrible, but what can I do whether it is presently put in? With among the list of lights I altered it about to a pendant gentle which decreased the heat near the roof even so the air barrier remains to be a problem.
The roof was shingles on t&g pine decking. Insulation was proper up in opposition to that pine decking because seventy seven and is 2014. Things looks like it had been installed yesterday. Not a foul spot everywhere, no roof vents wholly unvented roof.
Your decide to use two-inch-thick EPS as your air flow baffle will do the job. The EPS is rather vapor-permeable, so it enables a small amount of outward drying. (In almost any scenario, should you Construct a fairly airtight ceiling, there will not be any moisture During this assembly that needs to escape.)
It makes sense to ensure the very best layer of sheathing can dry to the outside when working with rigid insulation on an unvented cathedral ceiling. But How about the suggested water-proof underlayment for valleys, eaves, and lower-slope sections of roof?
Your proposed assembly is often a code violation. In order for you an unvented roof assembly, you'll want to retain the roof sheathing warm with spray foam find more info or rigid foam. Cellulose insulation is assessed as an air-permeable insulation and can't be Utilized in this type of roof assembly.
I am which includes a photo of the solution: spray foam held down through the top edge of the rafters to make sure that air is often drawn up from soffit vents to gable vents within the truncated attic cavity.
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I do think you suggest this: Your cathedral ceiling is presently uninsulated. If you find yourself indoors on the lookout up, you'll be able to see your rafters. Higher than the rafters you may see a layer of boards. Is usually that suitable?
Circumstance just like Eric, previously mentioned. If shut cell foam is sprayed or "cobbled" from xps, do You need to fill your complete Room, or only to thickness for sought after R benefit?
Thorsten Chlupp is in a Considerably more difficult local climate and he appears to be accomplishing good with straightforward loose fill to the attic floor....of course He's using "enough" amounts (cellulose galore)and he has baffles close to the soffit.