Live Load On Roof Truss

Dead loads are always present.

Live load on roof truss.

Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off. 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. 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. They support live and dead loads by efficiently transferring the loads to the building walls or supports.

The live load shall be taken as follows. Floor live load 40 psf. I for sloping or flat roof with slopes up to and including 10 degrees. Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the.

However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. 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. Live loads on roof trusses. Live loads are not always present.

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. 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. Examples of live loads are snow wind rain and temporary construction loads. Deep floor trusses at 24 o c.

With single 4x2 chords designed to support the following loads. 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.