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Your plan to use 2-inch-thick EPS as your air flow baffle will function. The EPS is relatively vapor-permeable, so it allows a little little bit of outward drying. (In almost any scenario, should you build a reasonably airtight ceiling, there will not be any dampness In this particular assembly that must escape.)
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As with all types of vent baffles, it’s a good idea to concentrate to airtight building approaches, especially if you can be installing air-permeable insulation in the rafter bays. Seal the edges of every panel with caulk, and tape the seams amongst panels with a high-quality tape. (If you're setting up air-permeable insulation like fiberglass, mineral wool, or cellulose, the ventilation baffle isn’t optional; it’s essential.
Pertaining to dense pack cellulose: undecided why dense pack would be negated - I think it flawlessly suited.
My viewpoint is that the steep facet of a mansard roof is really a roof. This is often especially true if the outside of your sloped assembly is finished with roofing.
The code constraints on the use of air-permeable insulation amongst rafters have been formulated to circumvent the roof sheathing from rotting. When fiberglass batts are set up in unvented rafter bays, the batts enable moist indoor air to get to the chilly roof sheathing.
Ensure that you put in insulation that presents at least the bare minimum code prerequisite for ceiling R-benefit. Insulation that exceeds the minimum code need is a lot better.
moisture to movement out of one's ceiling. The point is to test to take care of any dampness that tends to make its way roofing company richmond va there Regardless of
for an unvented building with no insulation higher than the sheathing, how about using wood fibreboard amongst the rafters right below and in touch with the sheathing? All gaps in between the boards and also the rafters stuffed with expanding foam / sealant. You could potentially roofing company bryan then include the rafters with rigid foam to convey your insulation nearly essential R degree and lessen the danger into the rafters and sheathing, after which you can set up your airtight drywall beneath this.
It really is certainly not limited to an R 80 Passive Home roof. Take out the parallel chord trusses and slender it up.
Any dwelling currently being built much better than the absolute minimums must in the quite least not use OSB for roof sheathing. Imo
In the choice, if we won't do a ventless roof that way, can we realize our total insulation needs by combining the above and underneath deck R-Values if we major everything with a vented in excess of-roof? Many thanks for your time and energy and also your information! Dan
An additional question is, must I carry on precisely the same insulation assembly outside? The last picture demonstrates a substantial 10' overhang. Should really I vent this exterior portion or seal the underside in the p.t. plywood deck with the Continue closed-cell insulation?
A. Either strategy will do the job, as long as you receive at least the minimal code R-value for the roof, and as long as you employ construction methods that listen to airtightness.