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Head to https://squarespace.com/awesomeframers to save 10% off your first purchase of a website or domain using AWESOMEFRAMERS ! The Final R51 Roof Video Description Most residential construction is built with a "t-shirt" level of protection, but on this high-performance home project, we’re going with the full "Sweater Approach." By wrapping the entire roof in continuous insulation (CI), we are hitting a total of R51 and virtually eliminating thermal bridging through the rafters. If you've ever wondered if exterior roof insulation is worth the extra labor for a vapor-open assembly, this deep dive is for you. We’re pulling back the curtain on a building envelope strategy designed to manage moisture and heat flow: The Air Barrier: Zip System sheathing (taped and rolled) for a primary air seal. The "Sweater": 3 inches of Rockwool Comfortboard 80 (rigid mineral wool continuous insulation). The Rainscreen: 2x4 battens creating a dedicated ventilation channel (1.5" air gap). The Outer Shell: A second layer of sheathing as the structural roof deck for the final roofing material. Building Science: Why R51 and continuous insulation are game-changers for energy efficiency and long-term durability. Roof Framing Math: Watch as I use the BuildCalc app to find the sleeper bevels and saw tilts (49.62 degrees!) for these complex valley angles. Structural Fasteners: Why the Simpson Strong-Tie SWD screw is the right choice for fastening battens over mineral wool without over-compressing the boards. Compressibility Test: Can you walk on Rockwool Comfortboard 80? I’m testing it with 185 lbs of "twisted steel and sex appeal" to show the rigidity. 🔨 Gear & Tools I Trust The Toolbox: Acme Tools - My Top Picks https://tinyurl.com/MyFavoriteTools Fastener Deals: * 5% Off: Use code NGDAWESOME Free Shipping: (Orders over $1,000) Use code FREESHIPPING Tool Belts: Badger Tool Belts https://badgertoolbelts.com/ Safety Glasses: Hyspecs (Use code Timmy10 for a discount) https://www.iwearhyspecs.com/ Hearing Protection: ISOtunes Bluetooth (10% off code: Timmy10) https://shop.isotunes.com/Timmy10 🥾 Apparel The Wood Butcher Boot: Nick's Boots x Awesome Framers https://tinyurl.com/WoodButcherHD 🎓 Professional Development & Drone Pilot Note: If you use a drone for commercial work—including YouTube—you must be Part 107 certified. I took Greg’s course, studied for a month, and scored a 95%. It’s the best training out there. Part 107 Course: Save $100 with this link https://tinyurl.com/DronePilotCourse 0:00 Cross Section Insulation Detail 1:57 Soffit Venting 3:19 Starting the Process 4:03 Hultafors Insulation Knife 4:38 Order of Operations 6:53 Cutting Valley Pieces 11:59 How to Install the Rockwool 13:47 Compressability 14:20 Installing at Valleys 16:17 Sheathing Over the Insulation 21:00 Fastening Battens 📱 Connect With Me Instagram: @awesomeframers TikTok: @awesomeframers YouTube: Pioneer Builders Inc Website/Blog: AwesomeFramers.com Company: Pioneer Builders Affiliate Disclosure: Some of the links above are affiliate links. If you purchase through them, I may earn a small commission at no extra cost to you. This helps support the channel—thank you! We're wrapping up this roof structure, showcasing the layers of sheathing, comfort board, and 2x4s. This video details the precise steps for building a robust and insulated roof, addressing common questions about venting. It's all about effective home improvement, ensuring each component, including the rockwool insulation, contributes to a secure and well-ventilated roofing system.