Follow this step‑by‑step checklist to choose, install, and detail roof insulation like a high‑performance builder.
Based on: The Roof! | Builder's Insulation Playbook - Episode 5 by Matt Risinger
▶ Watch the source video on YouTube
What if the single biggest performance upgrade you could make to a home was sitting right above your head — and most builders are still getting it wrong? Roof insulation sounds straightforward until you realize the details that separate a truly high-performing assembly from one that quietly fails over decades. And if you've ever wondered why your energy bills are stubborn, why moisture shows up in the wrong places, or why that attic just never feels right, the roof is almost always the culprit.
Here's the hard truth: the most common approach — blown-in insulation over the ceiling plane — can work well, but only if air sealing happens first. Most contractors skip it or rush it. And if you're layering in spray foam, fiberglass batts, or continuous exterior insulation without understanding the climate zone ratios, vapor dynamics, and sequencing, you're setting up a problem that won't show itself for years. By then, it's expensive and ugly to fix.
Imagine instead a roof assembly where you truly understand every layer — where the thermal boundary is, how vapor moves, when to use open-cell versus closed-cell spray foam, when a hybrid approach saves money without sacrificing performance, and how to add continuous exterior insulation whether you're doing new construction or a renovation. Picture yourself walking a job site and knowing exactly what questions to ask, what to inspect, and what to demand from your subs. That's the confidence this checklist builds.
Matt Risinger and Travis Brunger from Build Show are two of the most respected voices in high-performance building. Between them, they've built and renovated hundreds of homes across multiple climate zones. In this episode, they share the exact assemblies they use on their own projects — from the budget-friendly Rockwool batt approach to the premium monopoly-framed over-roof with two layers of Atlas polyiso. They reference Building Science Corporation's climate zone ratios, discuss the IRC 2024 code thresholds, and give you the real-world installation details that only come from doing this work for decades.
This checklist distills everything from that conversation into a clear, actionable sequence you can use on your next project. Every major roof insulation method is covered. Every key decision point is flagged. Every mistake worth avoiding is called out. Pull it up on your phone on the job site, hand it to your crew, or use it in your pre-construction planning meeting. This is the roof insulation reference you'll come back to again and again.
Every checklist item comes with actionable notes to guide you — things like "Don't forget to do this before you start," "Avoid this common mistake," or "Set a reminder for 30 days out." Nothing vague, just clear next steps.
+ 23 more action items inside...
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