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 point load limitation.

Calculating the load on a flat roof is a challenging task for the layperson that involves knowledge of building materials their weights and local building codes. 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. 910 pounds per lineal foot. Chapter 8 includes specifics for such things as allowable lumber to.

50 psf x 14ft 700 pounds per lineal foot. 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 ceiling construction requirements are listed in california residential code chapter 8. 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.

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.