Cellulose insulation can shop loads of humidity. This "dampness buffering" means is cited by some cellulose fans as A significant advantage, and certainly this means can occasionally protect against a little humidity challenge from leading to loads of rot.
Sometimes, these air flow channels are mounted higher than a layer or two of rigid foam. It’s also attainable to get nailbase (a sort of SIP with OSB on one aspect rather than two) that includes built-in ventilation channels between the OSB as well as the rigid foam; a person model of such panels is Interesting-Vent from Hunter Panels.
2. When you put in fiberglass batts, air barriers are much more vital than vapor Command. You will need a great air barrier on either side of your fiberglass batts.
It truly is much more vital that you have an inside air barrier than an inside vapor retarder. Be sure that you have made a fantastic air barrier by sealing all penetrations and cracks.
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JB- I really ought to write-up sketches as Ken did. It would in all probability avoid wasting difficulty. For me this was harking again into the compact roof string.
You are not the sole person with this worry. For individuals who (like you) are worried about the issue, there are two options:
You ought to seek the advice of an electrician about The easiest way to provide your ceiling electrical packing containers. There are plenty of possible alternatives -- some noticeable from the inside, plus some hidden by The brand new foam.
I imagine that you'll want to post a sketch. I can't visualize what you're speaking about from your description. If you wish to put in an HRV as part of your attic, why do you might want to put in a water resistant stucco roof around some kind of EPS box? Isn't really your attic already dry? Most attics have roofs.
Right up until a short while ago, making codes essential that insulated sloped roofs include things like ventilation channels immediately beneath the roof sheathing. Quite a few builders nonetheless follow this time-analyzed method.
I have a mansard roof with steep sides with gables, and a virtually flat leading by using a rubber roof. There won't be any vents, it hasn't been insulated prior to I commenced engaged on it and possess two questions:
No matter if it absolutely was encouraging a brother re-roof a dwelling after a hail storm, or using a sister-in-law who didn’t drive towards the medical doctor, he was often able to aid. He and two of his brothers constructed three loved ones houses among them.
As I spelled out during the short article on this webpage, You can not use fluffy (air-permeable) insulation within an unvented roof assembly Except if you consist of rigid foam or spray foam above the fluffy insulation.
Environmentally friendly builders commonly try i was reading this out to fulfill or exceed these minimum amount R-values. Having said that, the code delivers a number of loopholes allowing builders (sometimes) to obtain away with decreased ceiling R-values than demanded from the prescriptive desk.