New house question
After a lifetime in the Southwest, we are building our first home in a Zone 6 area (Northwest Montana near the Canadian Border). I stumbled across this website accidentally, and have read everything I can regarding insulation/ barrier techniques, but was hoping for some clarification.
The house is partially constructed now with windows and house wrap installed, but no siding, insulation or drywall yet. The walls are 2×6 sheathed by OSB wrapped in un-taped Tyvek. The plan is to install House Slicker rainscreen and then wood siding to allow drying to the outside. On the inside, the plan is to blow in fiberglass in the wall cavities, with either a MemBrain or Air Tight Dry wall as an air barrier. Which is a better choice? In either case, is the interruption of the wall at the second floor line sufficiently handled with caulk/ sealant at the rim/ plate joints or is there another superior method? Is this the best assembly given the current state of construction?
At the roof, half the house is vented attic and half is cathedral, with dormers. On the dormers and unvented sections, the plan is to fill the bays with closed cell foam and use ADA drywall bottoms. On the vented portions, would it be best to fill the ceiling joist bays with Closed Cell foam or blown in fiberglass? Would a MemBrain below the insulation be a good idea to prevent any airflow in case of gaps, settling or shrinkage?
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