If you wish to put in a mix of shut-cell spray-foam on the underside from the roof sheathing and air-permeable insulation concerning your rafters — an strategy from time to time referred to as “flash and batt†— the setting up code calls for that spray foam (or, arguably, rigid foam insulation) be “utilized in immediate connection with the underside on the structural roof sheathing†and the foam insulation meet up with the necessities “laid out in Table R806.
You don't need to utilize insect screen, since fiberglass batts must be enclosed by an air barrier on both sides. In the event the top facet of fiberglass batts are subject matter to wind-washing, the shifting air degrades the effectiveness on the insulation.
I employed to operate as being a roofer, and roofs which have been solely covered with Ice & H2o Defend make me anxious. I see this kind of style as lazy and probably problematic.
You are proposing a vented roof assembly. To get a vented roof assembly, the code doesn't demand that any foam insulation be placed in direct connection with your roof sheathing -- on the contrary.
Thanks for your feed-back. We won't ever A/C the making (It will likely be photo voltaic powered). The wind is really regular, but it is a humid natural environment, so humidity Manage is certainly on my thoughts.
If I understand correctly, you have just finished putting in some recessed can lights, and now you want to know how you can insulate all around and earlier mentioned these can lights. Your intention is to put in a different finish ceiling, underneath the rafters, after the insulation is installed. Is that suitable?
For those who go ahead with your strategy, you ought to consist of a wise vapor retarder on the inside side of the assembly, to attenuate the transport of humidity from the interior into the sheathing.
(d) There might be enough air leakage for the "soffit" and ridge to offer air circulation that acts how a ventilation gap ordinarily would.
It is fine to include foam board previously mentioned the roof deck even with the shut cell foam-board (what variety?) on the interior. Roof decks can not dry to the exterior via 0.one per shingles in any case, significantly considering the fact that in zone 5 it'll shell out a substantial period of time coated in snow/dew/rain Together with the humidity push heading inward, not outward.
Yesterday we blew the insulation and mounted the SIGA Majcoat over the CAPACES Management Institute. There was greater than eight,000 Cubic feet of insulation to set up, so our insulators experienced 2 in their blower vans and an excellent crew on web-site. They were blowing navigate to these guys cellulose as fast as they might and also the the rain was heading our direction. Under 45 minutes after the insulation was completed we experienced concluded the Majcoat and were being active taping seams.
The roof appears to possess a layer of asphalt shingles over the sheathing which has a tin roof about that. The soffits are closed off. Your house is way from the crushed route and It truly is hard to get any contractors out there to operate, not to mention supply bids so I am virtually alone.
I'm performing precisely the same element on my new construction. I purchased the insulation from David Volpe @ NationwideFoam.com. There is a area in Framingham, MA. I bought quite a few tractor trailer loads to insulate my home and barn for an exceedingly, really fair cost.
Thanks with the enter. I see a visit with a structural more engineer and 35 sq. of polyiso in my around long term.
Q. "The air barrier is to be put over the pine T&G ceiling and beneath the foam. Would you propose that we use one thing which can be each an air barrier in addition to a vapor barrier?