Roof Point Load Limitation

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.

Roof point load limitation.

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. 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. 15 psf x 14ft 210 pounds per lineal foot. 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. 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. 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. 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.

Chapter 8 includes specifics for such things as allowable lumber to.