06/25/2026
Good roof performance starts at the edge, where ventilation, insulation, and structural support all come together.
This cutaway view highlights how several building components work as a system:
* Air enters through the lower roof edge and moves upward beneath the roof deck, helping remove excess heat and moisture.
* Structural framing transfers roof loads safely into the wall assembly while maintaining the shape and strength of the roof.
* Insulation is positioned to reduce heat transfer and improve indoor energy efficiency throughout the year.
* The roof edge assembly helps protect vulnerable areas from moisture intrusion while supporting long-term durability.
Understanding how these parts interact makes it easier to see why proper roof detailing plays such a major role in comfort, energy performance, and building longevity.