Roof Truss Weight Limit

The dead load on a roof is the weight of the roof structure itself along with any permanently attached materials or structures on the roof so it must be designed first of all to support itself.

Roof truss weight limit.

For wood trusses with a total load of around 180 pounds per lineal foot 30 pounds per square foot spaced one at six foot or two at 12 feet a single 24 foot span 4 12 slope truss weight should be about 125 pounds. 05425 cold formed steel trusses roof truss spans every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project. That means you could lay a 2 x 4 ft. A typical load is 5 and 10 pounds per square foot.

A metal or double reinforced truss will be able to give double that amount. The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation. The ac unit will rest on curbing which runs perpendicular to the trusses and is spaced 4 ft apart. Scrap of plywood over the chords and set about 40 lbs.

The live loads a truss is required to bear are determined by local building codes. 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. Increasing the total weight on the floor to 4 480 pounds however results in a live load of 40 psf which is beyond the floor s load capacity. With an evenly distributed live load of 30 psf which the tables show the floor is able to support the total weight on the floor would be about 3 360 pounds.

Of stuff on it. The dead load on the bottom chord of a truss varies with the weight of materials attached to it such as drywall on the ceiling. An air conditioning unit weighing 2500 lbs. So if your ceiling is unfinished you have some excess carrying capacity up there.

The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.