If you want to make a ventilated insulated sloped roof assembly, pick a form of air flow baffle that may be mounted in an airtight fashion. Website-developed baffles are very best.
I am unsure what to do about the electrical for the present enthusiast, and with the not-nevertheless-mounted but A great deal sought after track lights. From the aged roof, the supporter's electrical source ran in addition to the T&G ceiling, and was lined by what appeared like electrical tape, then by a 1/2" layer of seem insulation board, after which from the felt and shingles.
If you would like select a material that is a bit extra vapor-permeable in your ventilation baffle, it is possible to -- for example, some individuals use skinny plywood or fiberboard On this location -- but you really do not have to. The EPS will function
Is it alright so as to add peel-and-adhere membrane to pick out areas of the roof and keep the rest breathable with tar paper?
To start with, many thanks Martin to the wealth of knowledge this website has. I have been traveling to it regularly for the last few a long time, ever considering that acquiring my initially home. I'm also situated in northern VT, zone 6 but I feel we can be pushing seven as a consequence of localized circumstances. I have just lately had an Electrical power audit carried out and wanted to verify one of several recommendations. We've a place which has a cathedral ceiling, in addition to a shed dormer developed to the cathedral. The cathedral ceiling is insulated with r38, as well as drop dormer with r19. Both equally are kraft confronted fiberglass. The roof is twelve/12 to the cathedral, unsure but significantly less about the dormer, and has snow coverage (frequently about eight") from the start of January right until mid March.
A lot of the data I operate throughout is apparently with the cellulose market that claims wind-wash is an enormous challenge with fiberglass; and with the fiberglass marketplace which asserts that the cellulose team overstates The problem and that to the extent wind-clean happens it is see this website absolutely inconsequential.
The roof appears to possess a layer of asphalt shingles more than the sheathing which has a tin roof around that. The soffits are shut off. Your house is way from the overwhelmed route and It truly is difficult to get any contractors available to operate, not to mention provide bids so I'm basically on my own.
Many thanks again with the responses. Now I just need to search out an installer With this place who understands what they're performing (thus far it's been iffy)!
My sense is that if we have been worried about air leakage compromising the insulation's efficiency, vent channels are problematic.
an air barrier. If you want to put in EnGard insulation batts in an unvented cathedral ceiling, You'll have to obtain a big layer of rigid foam insulation earlier mentioned the roof sheathing.
Since I've defined the right way to do it, I will even let you are aware that A lot of people have finished Anything you propose.
As Invoice Rose notes, air tightness of the assembly, both within and out, is of important importance - we have to stop the air flow. Therefore I'd suggest an assembly that utilizes materials intended to supply air tightness while also maximizing the drying potential on the roof assembly. The depth illustration I have attached shows such an technique. Solitex Mento one thousand membrane is applied on the surface from image source the insulation - a vapor open, nonetheless h2o and air-tight material - with vented cavity higher than - allowing for for maximum drying out and preventing any wind/air penetration on the insulation.
Again towards the vent plan. I actually think venting a roof that's airsealed in the inside perfectly and designed without having vent chutes is quite possibly The easiest method to build cathedral ceilings.
This is certainly a learn the facts here now possibility I'm taking into consideration in my residence to avoid wasting the past owners recently set up roof shingles, but the depth of the rafters cannot accomodate plenty of insulation to fulfill code. I am asking yourself if I need to furr out the rafters to have the desired thickness of spray foam, or if putting in a handful of inches of polyiso foam on the underside with the rafters, after the spray foam, could function?