Roof Truss Weight Capacity

Calculating the load on a flat roof is a challenging task for the layperson that involves knowledge of building materials their weights and local building codes.

Roof truss weight capacity.

How much weight your roof can hold before it caves in is a totally different question. A typical load is 5 and 10 pounds per square foot. When in doubt go light on the weight you re storing up there. The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions.

Don t look at their advertised weight capacity and think that your ceiling can automatically hold that. All weight hanging from the truss has to be added to the existing dead load. 24 truss 120 150 30 160 200 36 220 300 40 270 350 50 375 500 60 450 600 70 600 800 80 800 1000. My truss weight table per single truss.

This goes for manufactured roof trusses the kind assembled with metal gussets if you have traditional site built roof framing your storage capacity depends on the design of the framing. Trusses struts and props. Regardless of truss span or truss weight use common sense when lifting the trusses into place. 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.

Be careful and your roof system will perform admirably for generations. The standard guide in the u s the asce 7 05 lists weights and stresses for all building materials expressed in pounds per square foot. If the total weight exceeds the load limit of the truss then the truss is compromised. Most commonly the roof s internal support structure is composed of a fairly complicated system of structural elements designed to manage the load from the roof.

The straight lengths of wood known as members that roof trusses built with are connected with intersections that distribute the weight evenly down the length of each member. 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. Make sure items are spaced so that the weight is evenly distributed over the chords. The truss is a framework consisting of rafters posts and struts which supports your roof.