Live And Dead Load For Residential Roofs

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.

Live and dead load for residential roofs.

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. These dynamic loads may involve considerations such as impact momentum vibration and etc. Light frame wood roof with wood structural panel sheathing and 1 2 inch gypsum board ceiling 2 psf with asphalt shingle roofing 3 psf 15 psf. The total dead plus live loads equal the gravity load of the structure.

Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. 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. 910 pounds per lineal foot. With tar and gravel.

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. 50 psf x 14ft 700 pounds per lineal foot. Natural and engineered wood rest relatively lightly on the foundation but support less live loads than steel and concrete.