Roof Trusses Weight Load

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.

Roof trusses weight load.

Bcll 0 psf no storage available in floor trusses. In engineering calculations the span of a beam a truss is a beam is squared. This includes the roof deck and the supporting structure typically roof trusses and or rafters as well as the roof system itself. Of stuff on it.

If you have another floor above your garage the ceiling floor structure can usually support up to 40 lbs sqft including the weight of the floor above it. So if your ceiling is unfinished you have some excess carrying capacity up there. If you do not have another floor above the ceiling trusses may only be able to hang a maximum of 10 lbs sqft. Scrap of plywood over the chords and set about 40 lbs.

When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. The live loads a truss is required to bear are determined by local building codes. Don t forget to add all roof assembly materials when calculating total roof weight. Bcll 0 psf.

That means you could lay a 2 x 4 ft. This means a 30 foot span is 50 wider than a 20 foot span but must have 225 of the load carrying capacity. The formula for truss loads states that the number of truss members plus three must equal the twice the number of nodes. Is a safe estimate.

The load carrying capacity is handled by larger or higher graded material being used for the truss top and bottom chords as well as the webs. If the number of members is labeled m and the number of nodes is labeled n this can be written as m 3 2 n. Safe load per table 4 1 specifies a 2000 lb over a 2 5ft x 2 5ft area. The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation.