I don't imagine that the weight of plywood or OSB is going to be a problem, but If you're concerned about the extra excess weight, you could generally consult an engineer.
The GBA website isn't going to present tailor made particulars. That's what an architect or an engineer is for; I counsel that you just hire just one.
Initially, many thanks Martin to the wealth of data this Site has. I have been viewing it regularly for the previous couple of several years, ever considering that purchasing my initially dwelling. I'm also situated in northern VT, zone 6 but I believe we could possibly be pushing 7 as a consequence of localized problems. I have recently experienced an Electrical power audit done and wanted to verify among the list of suggestions. We have now a region which has a cathedral ceiling, as well as a lose dormer crafted into your cathedral. The cathedral ceiling is insulated with r38, and also the get rid of dormer with r19. Equally are kraft faced fiberglass. The roof is twelve/12 over the cathedral, not sure but considerably less on the dormer, and it has snow coverage (often about eight") from the start of January until mid March.
Q. "Are you saying that expanding ventilation to that second story attic would actually be a nasty idea, if we continue the foam about the complete next story gable roof, and rather we should always ensure it is absolutely unvented?"
Most building codes have to have 1 square foot of Internet free air flow region For each and every 300 square ft of attic floor place, assuming that fifty percent of the air flow openings are located within the soffit, and 50 % along the ridge.
Most people developing official statement vented cathedral ceilings use the inside drywall as their ceiling air barrier. The normal way to produce the transition involving the outside wall air barrier and the inside ceiling air barrier is to set up a broad bit of plywood along with the wall's top plate.
Need to i fully help sheathing seams parallel on the ridge line, for sheathing above an air hole? Would not that isolate the air underneath Each individual sheet of sheathing, and is the fact alright?
My perception is the fact if we are worried about air leakage compromising the insulation's success, vent channels are problematic.
I'm undecided should you are interested inside of a creating science remedy or simply a code respond to. From a code standpoint, that is a roof that needs to be insulated to R-49.
Thanks for that affirmation and assistance. Due to the fact everything is dry this time of 12 months and the house was just lately tented for termites, I'll insulate from the beam and seal up the apparent air entryways. The moment I'm able to see inside of I do think I'll have a greater plan the amount of dampness has long been in there over time.
to setup vent channels concerning the highest with the rigid foam and the very best layer of roof sheathing. I never ever explained that it was necessary
Suppliers of soffit vents and ridge vents normally specify The web no cost vent area in their solutions on item packaging or in specs offered on the web.
If We will place some insulation higher than the ceiling, then I desire to set Each of the insulation above the ceiling, and steer clear of the Value and problem of a new lowered ceiling. Which means a Construct-up of 8", working with XPS. If we build up the roof line previously mentioned the cathedral ceiling of the loved ones home by eight", we presumably will need to build up the rest of the adjoining gable roof too.
So how exactly does this try to look for a plan? Just about anything you'd change/insert/reorder? Do you agree with taping the seams in each layers of plywood?