Live And Dead Load For Residential Roofs

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.

Live and dead load for residential roofs.

15 psf x 14ft 210 pounds per lineal foot. 50 psf x 14ft 700 pounds per lineal foot. Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. With tar and gravel.

Natural and engineered wood rest relatively lightly on the foundation but support less live loads than steel and concrete. 910 pounds per lineal foot. These dynamic loads may involve considerations such as impact momentum vibration and etc. 3 3 dead loads dead loads consist of the permanent construction material loads comprising the roof floor wall and foundation systems including claddings finishes and fixed equipment.

The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings. Building materials are not dead loads until constructed in permanent position. The total dead plus live loads equal the gravity load of the structure. Live loads are usually unstable or moving loads temporary loads and based on the functionality of the structure.