You explain your proposed air barrier as "taped felt." I do not think asphalt felt may be effectively taped, and I don't believe that asphalt felt will make a very good air barrier.
to install vent channels amongst the top with the rigid foam and the best layer of roof sheathing. I under no circumstances explained that it had been vital
"The standard roof air flow requirement Utilized in constructing codes and asphalt roofing companies requires 1 square foot of "Web no cost ventilation location" for every 300 square feet of ceiling space (attic floor spot) when vents are evenly divided — 50 % of these substantial around the roof in the ridge, gable, or even a substantial roof, and half low about the roof for the eaves.
Most rafters aren’t deep sufficient to accommodate the insulation needed to meet up with minimum R-values demanded by code, especially if the rafter bays include a air flow channel.
Hi Everyone. I see I'm a bit late for the occasion on this thread but I hope somebody can still aid me. From my subject matter line you are able to see I have fairly the home. I am the home proprietor and disappointed with my leaky roof. I reside in WI and my roof has asphalt shingles.
I am somewhat stumped on this one particular - I would love to vent this roof assembly, but I am unable to say whether there'll certainly be a pure convective movement as there will be with rafters sloping With all the roof pitch. My rafters are running stage Nonetheless they sit on parallel curved top rated plates. I'm able to use twelve" rafters and make 10" of batt operate, leaving lots of air flow Place. I can drill the tops in the engineered joist flanges to allow air flow 'up-slope' (perpendicular for the rafters) and from the rafter bays, And that i can offer constant perimeter air flow (Cor-A-Vent strip) at my roof fascias (eave, ridge and gables).
Even though roof air flow can decrease the risk of ice damming, it’s important for builders to Restrict the stream of warmth into roof air flow channels by together with one or more ceiling air limitations and by putting in thick insulation, to make sure that as tiny heat as you possibly can escapes with the household.
And lastly, I kow the recessed lights is Terrible, but what can I do whether it is presently mounted? With on the list of lights I altered it around to a pendant gentle which minimized the heat close to the roof even so the air barrier remains a challenge.
Your proposed assembly is really a code violation. If you prefer an unvented roof assembly, you must retain the roof sheathing heat with spray foam or rigid foam. Cellulose insulation is classed being an air-permeable insulation and can't be Utilized in this type of roof assembly.
Like most see page mansard roofs, your roof is unvented. Your mansard roof has distinct sections -- the steep sections for the perimeter, plus the very low-slope segment in the center. Every one of these sections should be insulated in an identical way, mainly because all of these roof assemblies are unvented.
Just like all types of vent baffles, it’s a good idea to listen to airtight construction methods, especially if you'll be putting in air-permeable insulation within the rafter bays. Seal the perimeters of every panel with caulk, and tape the seams amongst panels by using a substantial-good quality tape. (Should you be installing air-permeable insulation like fiberglass, mineral wool, or cellulose, the air flow baffle isn’t optional; it’s demanded.
The ultimate way to continue can be to choose a more vapor-permeable sheathing materials -- one thing like fiberboard.
I'm developing a forensic laboratory created in Massachusetts, and am getting a difficult time reconciling relevant making code with my study in the literature pertaining to insulation and roof deck condensation.
Q. "The air barrier would be to be positioned above the pine T&G ceiling and below the foam. Would you endorse that we use a little check out this site something which happens to be both equally an air barrier along with a vapor barrier?