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.

Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. 50 psf x 14ft 700 pounds per lineal foot. Live loads are usually unstable or moving loads temporary loads and based on the functionality of the structure. 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.

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. 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. Building materials are not dead loads until constructed in permanent position. With conventional clay tile roofing.

15 psf x 14ft 210 pounds per lineal foot. The total dead plus live loads equal the gravity load of the structure. Natural and engineered wood rest relatively lightly on the foundation but support less live loads than steel and concrete. 910 pounds per lineal foot.