Air-Sealing at Exposed Beams
I’m currently under construction on a project and wanted to run by my air sealing strategy at some exposed beams by some other minds.
The project is a double-stud wall house in climate zone 6B. About 1/2 the house has a typical attic, the other half has a cathedral ceiling.
For the cathedral ceiling, the structure is parallel chord trusses that are 24″ deep. They will get a continuous ventilation channel from eave to ridge that will be sealed to the truss chords. The remainder of the cavity will be blown full with fiberglass. The trusses have 2 lines of bearing where they are supported by exposed beams (and we have added 2 more decorative beams to balance the design of the ceiling plane.) I am doing airtight drywall on the ceilings and walls in the project and am trying to find the best way to get a continuous air barrier at these beams. The ceiling finish is going to be 5/8″ drywall. I have been planning to put ice and water shield along each beam (adhesive side down) centered on each beam so that during drywall install the rest of the backer can be pulled off and the drywall on each side can be adhered to the ice and water shield. Does anyone have a better way to keep a continuous air barrier at each beam/drywall transition?