It would be interesting to know how the required 50 cfm to the attic balances out in terms of diluting humidity in the attic vs providing a little bit of positive pressurization (reducing humidity gain via summer infiltration). One way to achieve both is to use blown-in cellulose insulation. Does code allow this? FAQ: Why Do Some Builders Avoid Foam Insulation. Using cellulose to insulate the attic and the ducts fills all the surface areas more completely to better protect the entire system. Inspect The Attic Insulation Very cool. (Check with your installer or manufacturer’s website or bags to find the recommended depth.). Isn't this method of achieving R-13 flex duct creating multiple concentric vapor barriers? Once the duct work is sealed it’s time to decide on insulation. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. My plan is to use PVC pipe and to angle it slightly towards the exit vent. If any are suspended by strapping, carefully remove the straps and gently lower the ducts. Dana- Sign up for a free trial and get instant access to this article as well as GBA’s complete library of premium articles and Blown-In Insulation Cost. The Solution Thanks! Then pivot in place and do the same thing to the other side. I'm in zone 7, so the code doesn't apply to me. As most GBA readers know, ducts belong inside a home’s thermal envelope, not in an environment that’s cold in the winter and hot in the summer. https://www.energy.gov/sites/prod/files/2017/05/f34/BA-Webinar-unvented-attics-2017-may-18_0.pdf. Chances are, in an older home, the insulation may be lacking. You could also LIGHTLY spray for insects over … 8. Moisture could soak the insulation, stain the … Half-inch DensGlass is 23 perms (min), but is half-inch gypsum board really rigid enough with sufficient fastener retention for the uplift of hurricane force winds at the roof peak mounted to 24" o.c. Perhaps future revisions of the code would allow slightly lower permeance if combined with slightly larger vent ports at the ridge (currently limited to 12" max from the ridge, per subsection 5.2.1.). However, blown-in cellulose insulation is the perfect product to upgrade older insulation while also insulating the ducts. Why is there insulation in my air vents? Joe understands the physics and proposed these as a potential solution for several different climates. Nice job. Vapor diffusion port If the jacket is cold enough, and the attic air is humid…. (I doubt it, but don't know.) But many homeowners often neglect the need for insulating their HVAC ducts. I found, instead, a vintage 3 ton AC unit with 1" rigid insulation taped all over it and "insulated" flex duct snaking all over the poorly insulated attic. No amount of duct insulating will compensate for an under-insulated attic. Conditioned air is separated from the ambient air allowing the temperature to arrive to the rooms within the house at or closer to the temperature generating at the heating/cooling source. The best way to accomplish this is with a professional duct leak test. Efforts by energy-efficiency experts to convince builders to move their ducts indoors haven’t been particularly successful. Even better performance can be achieved, however, if the ducts are installed near the attic floor and buried in deep cellulose or blown-in fiberglass insulation. Most attic ducts are insulated flex ducts (that is, flex ducts with R-6 or R-8 fiberglass insulation, along with an exterior polyethylene jacket). The insulation bags will have the recommended depth and coverage for the product. If your round air ducts run below the joists, lay one insulation batt on top of the duct. Most code officials I've dealt with (OK, it's a small number, to be sure) usually go along with approaches & values that appear in newer versions of the code not found in the current state codes if you can point them to the relevant sections. Snap a plastic cap onto the duct end, then slip the preformed insulation over the duct. Current my ducts are suspended about 2 feet above the current blown in insulation, and I am in the Pacific Northwest zone 4 in the Marine Zone. Even better performance can be achieved, however, if the ducts are installed near the attic floor and buried in deep cellulose or blown-in fiberglass insulation. The attic will also be well insulated for maximum overall energy efficiency. The depth can be slightly increased, where practical, to fully cover the ducts. If the insulation in your house’s HVAC ductwork has seen better days, consider replacing or upgrading it to improve energy efficiency and reduce your utility bills.. But if the same ducts are buried in cellulose or fiberglass insulation, the added insulation lowers the temperature of the polyethylene jacket. Learn more about this important step here. In this case, two installers are needed: one to feed insulation and operate the machine on the ground; and the other positioned in the attic to install the blown … Thank you. If ducts aren’t buried with insulation, they usually don’t sweat. One way to achieve both is to use blown-in … See section R806.5, subsection 5.2: https://codes.iccsafe.org/public/document/IRC2018/chapter-8-roof-ceiling-construction. When you need to add insulation to an attic, crawl space, or walls of a home, the fastest and most cost-efficient method is to use blown-in insulation. This results in higher energy costs as the HVAC system must work harder to compensate. While in the attic, inspect the insulation as well as the ducts.
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