Roof Weight Distribution

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 weight distribution.

My racking system with the modules weigh about 42 lbs per module. Actually with snow you don t get more load along the slope of the rafter. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. Metal roofing aluminum or steel panel sheet or shingle 1 2 lb m ft 2 5 9 kg m 2 terne plate copper bearing steel sheet 0 7 lb m ft 2 3 4 kg m 2 wood shingle or shake 2 4 lb m ft 2 11 7 kg m 2.

This is all of the natural stresses imposed upon a roof such as snow loads rain loads and wind loads. A clay tiled roof may have a dead load. I need to be able to show this to get the inspector to buy in so i ll need formulas with the answer. I an installing a solar array on the roof 24 modules 13 78 sqft each.

Dead load weight of roof trusses top chord bottom chord webs weight per lineal foot plf 2x4 2x4 2x4 4 3 2x4 2x8 2x4 5 6 2x6 2x4 2x4 4 8 2x6 2x6 2x4 5 5 2x6 2x6 2x6 6 2 2x6 2x8 2x4 5 9 2x6 2x10 2x4 6 6 2x6 2x10 2x6 7 2 2x8 2x8 2x4 6 6 2x8 2x8 2x6 7 2 2x8 2x10 2x8 8 4 dead load weight of floor trusses depth in inches top chord bottom chord. Structural engineers use the solar panel roof load calculator to come up with the correct load capacity of the roof material. This is because as snow falls vertically it spreads itself further along a sloping rafter and so. Determine the transient load of the roof.

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 are created by attaching the ends of members to joints known as nodes. A majority of roofs can withstand the weight of solar panels. A roof truss is a triangular wood structure that is engineered to hold up much of the weight of the rest of the roof.

Roof structure and load bearing capacity. The amount of weight the internal support structure can carry without the roof collapsing can be described as its load bearing capacity. This is highly regional as weights of snow for example range from 10 to 300 pounds per square foot based on moisture and volume of the snow. The live loads a truss is required to bear are determined by local building codes.

Load distribution on a roof. You get the same load as a flat roof with the same run would get. A roof is composed mainly of two parts the cladding or external material and the internal support structure which holds it up. Thus as the roof gets steeper the rafter gets longer and the weight of roofing materials increases.

The local ahj has ammended snow loads for the area to 40 psf.