[Editor's Take note: Invoice Rose just sent me the next reviews within an e-mail; he provided his authorization to article the remarks.]
I am undecided what to do with regard to the electrical for the present fan, and for your not-but-mounted but Considerably ideal track lights. Inside the old roof, the fan's electrical offer ran along with the T&G ceiling, and was covered by what appeared like electrical tape, then by a 1/2" layer of audio insulation board, after which you can through the felt and shingles.
As with all kinds of vent baffles, it’s a good idea to listen to airtight construction procedures, particularly when you can be putting in air-permeable insulation from the rafter bays. Seal the sides of each and every panel with caulk, and tape the seams involving panels by using a high-good quality tape. (For anyone who is installing air-permeable insulation like fiberglass, mineral wool, or cellulose, the air flow baffle isn’t optional; it’s needed.
Regarding dense pack cellulose: not sure why dense pack will be negated - I think it perfectly suited.
Initially, thanks Martin for the wealth of data this Internet site has. I have been checking out it often for the previous few many years, at any time since buying my initially property. I'm also located in northern VT, zone 6 but I think we might be pushing 7 on account of localized problems. I've recently experienced an Power audit executed and wanted to confirm on the list of recommendations. Now we have a place by using a cathedral ceiling, in addition to a shed dormer designed in to the cathedral. The cathedral ceiling is insulated with r38, as well as get rid of dormer with r19. Both are kraft faced fiberglass. The roof is twelve/twelve around the cathedral, not sure but considerably less on the dormer, and has snow coverage (normally above eight") from the beginning of January until eventually mid March.
Hello John - This challenge was in Vermont within a ten-12 months old house and as the caption indicates, the primary perpetrator was leaky can lights in the cathedral ceiling. But the specific situation was exacerbated by an connected greenhouse, which communicated with the rest of the home, plus a dresses dryer vented to the indoors in the course of the Winter season.
The specific design shown was for your Passive House. The roof thickness & utilization of a service cavity could possibly appear to be overkill for some jobs, but If you would like an airtight lid, a provider cavity can get you there - completely... And enable you to wire and next light-weight the interior.
Can I get some more commentary about the "total roof" of Ice & Water Defend? I feel this had little or no to perform With all the failure. The key reason why why I question is I've a similar "whole roof" design and style arising, Having said that, the rafter bays are all straight operates with soffit Your Domain Name vents, steady vent baffles (one/two" plywood) and ongoing ridge vent. Dense pack cellulose, two" XPS beneath 2x10's, air limited drywall (XPS can be sealed up way too).
Here's what you wrote: "I understand that there's no caulk/sealant involving the aspect in the beam as well as the position where the drywall butts in opposition to it, so There's a smaller air hole there. My memory is that fiberglass insulation was applied. There is unquestionably no vent during the roof."
Until eventually a short while ago, building codes demanded that insulated sloped roofs contain ventilation channels immediately beneath the roof sheathing. Many builders even now stick to this time-analyzed procedure.
We really Never know if these roofs have suitable vent channels, or what type of vent baffles (if any) were being used to maintain the air flow gap in between the top of your fiberglass insulation and the underside on the roof sheathing.
 He also appreciated the outside, an excellent Cardinal baseball activity, and investing time with his spouse and children. He would always head out of his way that can help any one he could and can be skipped by several.
The previous Canadian general guideline -- a minimum of two/3 of the entire R-value on the exterior aspect of the vapor barrier -- can be a find out here tough-and-Completely ready way to deal with this question; it's also feasible to technique the dilemma by accomplishing a dew-place Investigation or maybe a WUFI analysis.
My opinion would be that the steep side of the mansard roof is a roof. This can be very true if the outside on the sloped assembly is finished with roofing.