Until a single takes advantage of Intense treatment with The nice and cozy aspect air barrier which includes figuring out that all fastener penetrations are sealed as well you should believe some air move. The installation referred to right here with the ice and water shield underneath the shingles definitely manufactured a far better air barrier than whichever was on The nice and cozy side.
Thank you, Martin and Stephen. Fortuitously we've been inside of a condition the place we can pause and rethink, as the new felt has long been put, However they have not begun installing shingles nonetheless. I'll explore the problem With all the contractor once again. I could possibly get him to reconsider.
I'm a homeowner in Seattle. Have a freshly-framed, vented cathedral ceiling to insulate. Straight bays, 2x12, 24" o/c. The present prepare is to work with batts of some type inside the bays, choose care to air seal the inside floor, avoid penetrations, air seal the vent channel much too (bays entirely sealed), double primary the inside floor for vapor resistance. I've a pair questions on baffling the vent channel: one. A number of the setting up pros I am dealing with feel the jury remains out on baffles and they are recommending leaving the batts open towards the channel except close to the vents, assuming the one-two" air channel might be maintained.
Q. "Must I bite the bullet and danger of spray foam insulation, or mail the builders again up within the roof in December to cut ridge and soffit vents?"
However, in certain parts of the nation, specifically in the Northeast, insulation contractors have been dense-packing unvented rafter bays with cellulose for years. Since the method has deep roots in New England, many developing inspectors take these types of installations.
The roof seems to possess a layer of asphalt shingles above the sheathing having a tin roof about that. The soffits are closed off. The house is way off the beaten route and It really is difficult to get his explanation any contractors on the market to work, let alone present bids so Discover More I am pretty much alone.
You wrote, "the rafters are still exposed," but I am not sure Whatever you indicate by that. Do you have got kraft-faced batts concerning the rafters, Together with the kraft dealing with nonetheless visible?
If you need to install a combination of closed-cell spray-foam on the underside of your roof sheathing and air-permeable insulation in between your rafters — an tactic occasionally referred to as “flash and batt†— the constructing code requires that spray foam (or, arguably, rigid foam insulation) be “applied in direct contact with the underside of the structural roof sheathing†and that the foam insulation satisfy the necessities “laid out in Desk R806.
I've previously insulated the steep sides of my unvented mansard roof with six" fiberglass (And that i experienced it inspected), would you suggest I rip that out and use spray or board foam? I've gotten Roofers in Huntsville TX conflicting data on irrespective of whether to deal with it like a wall or a roof.
It makes sense to verify the very best layer of sheathing can dry to the outside when making use of rigid insulation on an unvented cathedral ceiling. But How about the proposed water-proof underlayment for valleys, eaves, and small-slope sections of roof?
Thanks all over again. The roofer agrees that 2x4 framing to boost the peak in excess of the vented attic could be a workable Alternative to match up the roof traces.
Set up shut-cell spray foam versus the underside of your roof sheathing, and no other type of insulation. Ensure that the thickness in the spray foam is sufficient to meet minimum code needs. Remember that open up-cell spray foam is dangerous in all climate zones, and when open up-mobile spray foam is mounted With this locale in a cold local climate, the underside on the cured foam must be coated with gypsum drywall that has been painted with vapor-retarder paint. Vapor-retarder paint is ineffective if it is sprayed immediately over the cured foam.
If you prefer a vapor-permeable materials that continues to be an air barrier, decide on fiberboard sheathing. But use caulk round the perimeter, and tape with the seams, to make certain that the fabric is mounted within an airtight way.
Should really I use airtight baffles or not, I don't see a way to have humidity escaping in the assembly with airtight baffles, fiberglass and xps on the inside, regardless of the the dew level will probably be within this assembly And maybe produce condensation that cannot evaporate devoid of air flow.