Matt and Steve examine a 2019 modern home in wooded New Hampshire, where the cold Climate Zone 6A environment demands careful roof design. The home features a low-slope, 3:12 standing-seam metal roof, demonstrating how effective ventilation can work with relatively shallow roof pitches. They explain how ZIP System® sheathing connects the wall and ceiling air-control layers and why installation sequencing matters before the roof trusses go in. Both roof and wall assemblies are vented to support exterior drying, while an interior vapor retarder manages winter humidity. The discussion also highlights smart vapor retarders and proportional insulation across the foundation, walls, roof, and windows, connecting building-science principles with practical construction decisions.