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Contractors detail exterior sheathing and air-vapor barriers on school additions
Summary
Great Falls contractors described exterior sheathing (Enz Glass, Advantech) and 3M air-vapor barriers used on the Carolyn Small School and Mabel I. Wilson addition, including application, overlap and the use of permeable versus nonpermeable products.
On Episode 6 co-host Camden Burke (high school student) asked contractors about the exterior envelope. Bob, one of the contractors, described exterior sheathing as "just like a cover of the framework" that acts as a backing for siding and contributes to weather protection. Jake and Bob noted the project uses different sheathing products depending on the application and that some Advantech sheathing is produced in Maine.
Travis described air-vapor-barrier practice on the project and named a 3M self-adhering product used on the sheathing: "So we're using it's a product from 3M, air vapor barrier. It's just a it's a self, adhering product." The contractors said installers apply required overlaps, roll the material to minimize bubbles for a good seal, and that the project uses both nonpermeable and permeable air-barrier products (the permeable product is used near parapet/soffit areas to allow vapor escape). They contrasted those sheets with roof "ice and water" shields, which are bituminous and self-healing but intended mainly for roof applications.
