Reduce-and-cobble is really an insulation process used by some homeowners, but never ever by insulation contractors. It consists of cutting rigid insulation into slender rectangles, and inserting the rectangles in between rafters or studs.
Code does not look to use because it's grandfathered in. It appears like I should redo the hall ceiling.
2. Everytime you put in fiberglass batts, air barriers are a great deal more critical than vapor Command. You need a superior air barrier on either side within your fiberglass batts.
You don't want to employ insect display, for the reason that fiberglass batts have to be enclosed by an air barrier on each side. Once the prime facet of fiberglass batts are subject matter to wind-washing, the moving air degrades the effectiveness of the insulation.
It is quite feasible to structure an unvented insulated roof assembly that performs properly, provided that you get the main points appropriate.
The most beneficial solution is to handle the problem from above, by incorporating a substantial amount of rigid foam earlier mentioned your present roof sheathing. It is possible to Develop up the levels by yourself, of You should purchase SIPs or nailbase panels.
I are in northern Vermont, and I don't have more than enough experience with air-con to reply your query about condensation on interior ducts.
As outlined previously mentioned, we hope to switch the roof this next calendar year. If that's so, At the moment I'd wish to enhance to either an unvented roof or if necessary a chilly roof (a vented more than-roof). (I don;t recognize that it issues during the equations, but we're checking out getting and putting in stamped steel shingles.
But Should the installer is conscientious, and the rafter bays really are dense-packed, my guess is that almost everything are going to be high-quality.
Right up until not long ago, creating codes demanded that insulated sloped roofs incorporate air flow channels directly beneath the roof sheathing. Lots of builders nevertheless abide by this time-tested procedure.
Thanks for finding the thread above...note that in publish #seventeen, Robert Riversong talks with regards to the "vented over roof". I agree along with you that this method warrants some notice for cathedral ceilings.
Rafters are 2x4, twelve/twelve slope, as well as roof is intricate with intersecting ridge traces, valleys and dormers. (Your house initially experienced a cedar roof. The deck is the traditional spaced fir planks.) As a consequence of the development, there is almost no probability of obtaining satisfactory air consumption through soffit Discover More vents. (Along with the structure difficulties, you'll find complications since all the spaces between rafters wherever they fulfill the very best plate ended up bricked in, seemingly at time of design). Appropriate regular stream-through underdeck roof ventilation is going to be hard. Whenever we initial looked into this project, the developing inspector questioned us to continue to use vent channels (low-priced polystrene was Okay) to seize whichever ventilation we could.
Joe Lstiburek: "A vented attic, the place insulation is put on an air-sealed attic ground, is Probably the most about his underappreciated developing assemblies that We now have during the background of constructing science."
My view would be that the steep facet of a mansard roof is actually a roof. This is especially true if the exterior with the sloped assembly is finished with roofing.