HELP! Air barrier trapped by ceiling and interior walls. How to fix? Impossible to install?
I am new to the Pacific Northwest and am an architect by trade, playing GC for my own home. I’m concerned that I created a huge issue due to a sequencing oversight that could greatly diminish the continuous air barrier I detailed and was striving for. Please let me know your thoughts. Framers are leaving site next week (July 10,2023) and I am open to having them re-work issues to save air sealing headaches down the road.
I brought my air barrier from the exterior to the interior above the top of my top wall before trusses were dropped. (side note, trusses have a 1′ “leg” because walls were framed at the wrong height…)
ISSUE: Framing continued before I was able to secure the air barrier to the bottom cord of the truss. Now the barrier is flapped down, pinched between drop ceilings that were framed. (see photo 1)
Additionally, interior walls were framed and I am uncertain the best way to install a continuous air barrier when the walls block the install of air barrier along the bottom cord of truss. (see photo 2)
One fix: I am going to have framers remove the drop ceiling, which I was mainly installing to avoid holes in barrier due to lights and ceiling fans. I’ll just use tenmat and seal with foam. The framing of the ceiling cause many more penetrations and install issues!
Using Mento 1000 as exterior air barrier, transitioning to a less robust membrane on interior (proclima DB+.) Both vapor open assemblies. Vented attic, R60 blown in cellulose.
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