Roof Truss Weight Limit

The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation.

Roof truss weight limit.

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. 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. A typical load is 5 and 10 pounds per square foot. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.

Is to be supported by 5 trusses in the roof of a restaurant. The ac unit will rest on curbing which runs perpendicular to the trusses and is spaced 4 ft apart. 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. 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.

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. A metal or double reinforced truss will be able to give double that amount. So if your ceiling is unfinished you have some excess carrying capacity up there. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70.

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. An air conditioning unit weighing 2500 lbs. Of stuff on it. The live loads a truss is required to bear are determined by local building codes.

That means you could lay a 2 x 4 ft.