Live Load On Roof Truss

Deep floor trusses at 24 o c.

Live load on roof truss.

2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. A when access is provided 1500 n m 2 b when access is not provided 750 n m 2 except for maintenance ii sloping roof with slope greater than 10 degrees. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. Dead loads are always present.

Floor live load 40 psf. Sec 07 version 2 0 handout section 07 codes load types problem 3 given. If the bottom chord of a roof truss functions as a floor joist such as in an attic room it carries a live load that also varies by use but a typical live floor load for a residential space is about 40 pounds per square foot. Live loads on roof trusses.

They support live and dead loads by efficiently transferring the loads to the building walls or supports. The live loads a truss is required to bear are determined by local building codes. With single 4x2 chords designed to support the following loads. In other words on a steep roof less material would be stacked in a concentrated area at one time to avoid having it slide off.

Roof truss basics roof trusses are engineered wood alternatives to hand framed rafters. If unbalanced snow loading isn t required or specified the truss designer may enter the 25 psf snow load as a top chord live load tcll set the load duration factor to 1 15 for snow and turn snow loading off completely. Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off. Live loads are not always present.

I for sloping or flat roof with slopes up to and including 10 degrees. Examples of live loads are snow wind rain and temporary construction loads. In my region on cape cod we have a ground snow load design of 25 psf which is a greater design load than the live load 12 psf to 20 psf over an entire roof system.