A deep dive into cathedral roof design and insulation strategy. The team compares solid-sawn rafters vs. scissor trusses, smart vapor retarders vs. poly, and discusses optimal roof pitches. You’ll learn when to vent from the topside, from below, or go unvented entirely—and why those choices matter. In the last 10 minutes, the crew unpacks one of building science’s trickiest topics: 6-sided containment of air-permeable insulation—and how it impacts attic R-values and energy performance. ...
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A deep dive into cathedral roof design and insulation strategy. The team compares solid-sawn rafters vs. scissor trusses, smart vapor retarders vs. poly, and discusses optimal roof pitches. You’ll learn when to vent from the topside, from below, or go unvented entirely—and why those choices matter. In the last 10 minutes, the crew unpacks one of building science’s trickiest topics: 6-sided containment of air-permeable insulation—and how it impacts attic R-values and energy performance. ...
131 - Two Q's: Isn't ZIP-R backwards? Shouldn't we rainscreen roofs as well as walls?
UnBuild It Podcast
29 minutes
6 months ago
131 - Two Q's: Isn't ZIP-R backwards? Shouldn't we rainscreen roofs as well as walls?
Two great questions on which the boys pontificate in fine form. Yes, ZIP-R is "backwards" (rigid insulation interior to structural sheathing) but that does not mean that it doesn't work; it does, just differently. So why don't we typically rain screen roof claddings? The short answer is it always costs more, regardless of the type of roof cladding. But you know the saying: vent until you can't... NOTE: - An Apology: Pete keeps saying "vinyl siding" when he means "vinyl wallpaper" in terms of...
UnBuild It Podcast
A deep dive into cathedral roof design and insulation strategy. The team compares solid-sawn rafters vs. scissor trusses, smart vapor retarders vs. poly, and discusses optimal roof pitches. You’ll learn when to vent from the topside, from below, or go unvented entirely—and why those choices matter. In the last 10 minutes, the crew unpacks one of building science’s trickiest topics: 6-sided containment of air-permeable insulation—and how it impacts attic R-values and energy performance. ...
