What is the dead load of a roof?

The dead load of a roof refers to the static weight that the roof structure must support, which includes the weight of the roofing materials, structural components (like beams and trusses), and any permanent fixtures (such as HVAC units). This load is critical in structural engineering as it informs the design and safety assessments of the building. Dead loads are typically calculated in pounds per square foot (psf) and remain constant over time, unlike live loads that can vary. Properly accounting for dead loads is essential to ensure stability and durability in construction.