Roof Trusses Weight Load

When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.

Roof trusses weight load.

The truss is analyzed for each possible location of the 640 plf load along the span. Bcll 0 psf. Don t forget to add all roof assembly materials when calculating total roof weight. 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.

This translates into a uniform load of 640 plf across 2 5 ft of the span. This includes the roof deck and the supporting structure typically roof trusses and or rafters as well as the roof system itself. The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation. This means a 30 foot span is 50 wider than a 20 foot span but must have 225 of the load carrying capacity.

So if your ceiling is unfinished you have some excess carrying capacity up there. That means you could lay a 2 x 4 ft. Of stuff on it. Safe load per table 4 1 specifies a 2000 lb over a 2 5ft x 2 5ft area.

If you do not have another floor above the ceiling trusses may only be able to hang a maximum of 10 lbs sqft. Bcll 0 psf no storage available in floor trusses. Is a safe estimate. Scrap of plywood over the chords and set about 40 lbs.

In engineering calculations the span of a beam a truss is a beam is squared. 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. For trusses at 2 ft o c. The live loads a truss is required to bear are determined by local building codes.