Roof Load Width Formula

Roof load area rlw u p span left u p span right or with fan struts.

Roof load width formula.

2x4 2x6 2x8 2x10 2x12. This is the sixth video in the series on the timber framing code. Multiply the length by the width to get the measurement for the area. Both sides of the equation should be equal in order to end up with a stable and secure roof structure.

Snow load thickness density the result snow load or the pressure exerted by the snow has the units of kn m or lbs ft. 15 psf x 14ft 210 pounds per lineal foot. 910 pounds per lineal foot. The formula for truss loads states that the number of truss members plus three must equal the twice the number of nodes.

It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. Floor joists ceiling joists rafters snow load rafters roof live load deflection limit. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. You can also find the load per square meter or square foot of roofing by opening the advanced mode.

Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Roofs are under a lot of pressure. Measure the length and width of the carport to determine the area of the roof in square feet. For instance a 7 12 roof pitch means that the roof rises 7 inches for every.

If you want to calculate these values by hand use the following formulas. 50 psf x 14ft 700 pounds per lineal foot. This video looks at roof load width rlw. If the number of members is labeled m and the number of nodes is labeled n this can be written as m 3 2 n.

Load limits on the roof of a building. Spacing in 12 16 19 2 24. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Roof load width rlw rafter span if placed at midspan otherwise span1 span2.

Rlw is used to calculate the sectional size of some roof members and supporting wall. 3 stud construction standard utility.