Roof Point Load Limitation

Crane hook loads need not be combined with roof live loads or with more than three fourths of the snow load or one half of the wind load.

Roof point load limitation.

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. Roof pitch is expressed as a ratio of the amount of the roof s vertical rise over a corresponding horizontal distance called the run pitch is written assuming a run of a foot or 12 inches so the ratio describes how much the roof rises for every foot of its run. These requirements cover the design and construction of roof ceiling systems including roof framing roof drainage roof sheathing ceiling finishes roof ventilation and attic access. 50 psf x 14ft 700 pounds per lineal foot.

Flat roof snow loads of 30 psf 1 44 kn m 2 or less and roof live loads of 30 psf 1 44 kn m 2 or less need not be combined with seismic loads. The standard guide in the u s the asce 7 05 lists weights and stresses for all building materials expressed in pounds per square foot. 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. 15 psf x 14ft 210 pounds per lineal foot.

Roof ceiling construction requirements are listed in california residential code chapter 8.