Building a Vaulted High-Performance and Foam-Free Roof Assembly
Josh Salinger shows us how to create more space and vent a roof, and do it all with a reduced environmental footprint.
Josh Salinger, owner of Birdsmouth Design-Build, is on-site in Portland, Ore., to discuss the vaulted high-performance and foam-free roof assembly on their latest ADU build.
Vaulted roofs are a popular option because they create usable living space where an attic would usually be. Typically, plastic forms such as spray-foam insulation or rigid foam are used to deter condensation and moisture issues in a roof assembly.
In this video, Josh shares his plastic-free solution to manage moisture and allow for full-depth insulation with proper venting while creating a high-performance vaulted roof assembly.
Read more about all the details of this roof assembly in Josh’s article A New Take on Insulating a Roof.
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R-value?
Curious about the nailing spacing for the 2x4s on top of the roof rafters. These will be transferring the shear load from the sheathing. Presumably framing nails at some spacing. I don't think it's handled in the prescriptive code so you would need an engineer to calculate.
I like it. It's simple, uses common materials/techniques, etc.
One thing it doesn't do is break the thermal bridges through the assembly.
I'll have to think about that one some more.