Posted on October 12, 2015 by ScottG
In Minnesota, Jeff Fredrickson is planning a new house, and his research has included lots of reading on the design and construction of exterior walls. His goals are twofold: a wall that will stay mold-free for decades, and one that is "somewhat energy efficient."
Starting at the inside, the wall would go like this: drywall, a polyethylene vapor barrier, JM Spider insulation in 2x6 stud walls, 1/2-inch plywood sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen.
, a water-resistive barrierSometimes also called the weather-resistive barrier, this layer of any wall assembly is the material interior to the wall cladding that forms a secondary drainage plane for liquid water that makes it past the cladding. This layer can be building paper, housewrap, or even a fluid-applied material. (Benjamin Obdyke HydroGap), fiber cement and stone veneer claddingMaterials used on the roof and walls to enclose a house, providing protection against weather.