Matt and Steve dive into the most common—and most forgiving—roof systems in America: vented attics framed either on-site (cut roof) or off-site (truss roof). With insulation at the ceiling plane and airflow from soffit to ridge, these systems are reliable and cost-effective—but only if detailed properly. Learn how overhangs impact moisture control, why penetration placement matters, and how to ensure airtightness at critical wall-to-roof connections. Plus: solutions for wind washing, smart vapor control, and whether an “underground roof” is ever worth it.