Thanks for your responses. We will never A/C the building (it will be solar run). The wind is pretty regular, however it is a humid ecosystem, so humidity Regulate is certainly on my intellect.
If possible, incorporate a ventilation channel earlier mentioned the top of your respective insulation layer. The air flow channel will offer low-priced insurance coverage against dampness Construct-up, and can decrease the prospect of ice damming.
Most rafters aren’t deep enough to support the insulation necessary to meet up with least R-values necessary by code, particularly when the rafter bays contain a ventilation channel.
Cut-and-cobble is really an insulation strategy utilized by some homeowners, but never by insulation contractors. It requires cutting rigid insulation into slim rectangles, and inserting the rectangles amongst rafters or studs.
an air barrier. If you want to set up EnGard insulation batts within an unvented cathedral ceiling, You will need to acquire an important layer of rigid foam insulation above the roof sheathing.
If it seems like I am outside of my depth in this article... yeah, you wager, I'm. I am just a homeowner, with only a few times of World-wide-web analysis less than my belt. Even so the contractor isn't aware of this roofing procedure, so we are being forced you could look here to determine it out with each other. Respect your assist immensely.
This is the standard respond to for people who ought to comply with most creating codes (the answer originates from an short article by Mike Guertin):
If you put in 2x4s (or 2x3s on edge, mounted with very long screws) perpendicular towards the rafters, you will tackle many of the thermal bridging concern with no should insert a layer of rigid foam.
I see your stage. I haven't worked with fiberboard. Can it be taped and regarded a trustworthy Key air barrier?
I don’t Assume I'm able to meet up with each of the guidelines that I’ve Continue reading this Web site, supplied existing design constraints and reluctance of my contractor to carry out insulation earlier mentioned the sheathing and foam for The brand new cavity.
It can be Secure to state that an existing home doesn't have excellent roof ventilation if there are not any soffit vents or ridge vents. It's also Protected to declare that, whether or not you will find soffit vents and ridge vents, the roof isn't ventilated if it includes valleys, hips, dormers, or skylights.
Thinking about the deadly pic I truly feel there could be an easy however unorthodox Remedy. Every one of the rot from heat wet air fulfills cold Wooden is right near where a vented hip could possibly have averted all and Devoid of vent chutes.
[Editor's Observe: Bill Rose just sent me the subsequent remarks within an e-mail; he included his permission to post the responses.]
More details on how to insulate an unvented roof assembly is delivered from the post on this website page.