Jake Bruton visits a job site in Austin, Texas, where Matt Risinger's crew is installing ZIP R sheathing on a roof — an application Huber has quietly spec'd but not widely promoted. Bruton walks through the assembly: a structural sheathing layer first, then ZIP R9 on top, with a Delta Trella drainage mat sandwiched between. He explains the thermal bridging benefits and why Huber requires the base layer, but questions whether the added cost and labor of double-sheeting a roof pencils out in most climate zones. The method makes the most sense in southern climates with conditioned, unvented attic assemblies.

Matt's referenced video: https://www.youtube.com/watch?v=zVi2ltsJs8U

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