Live And Dead Load For Residential Roofs

The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings.

Live and dead load for residential roofs.

Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. With conventional clay tile roofing. 15 psf x 14ft 210 pounds per lineal foot.

910 pounds per lineal foot. Live loads are usually unstable or moving loads temporary loads and based on the functionality of the structure. With tar and gravel. The total dead plus live loads equal the gravity load of the structure.

Building materials are not dead loads until constructed in permanent position. Natural and engineered wood rest relatively lightly on the foundation but support less live loads than steel and concrete. These dynamic loads may involve considerations such as impact momentum vibration and etc. On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof.