Roof Load Width Formula

You can also find the load per square meter or square foot of roofing by opening the advanced mode.

Roof load width formula.

2x4 2x6 2x8 2x10 2x12. Both sides of the equation should be equal in order to end up with a stable and secure roof structure. The formula for truss loads states that the number of truss members plus three must equal the twice the number of nodes. 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 area rlw u p span left u p span right or with fan struts. Step 2 determine dead load by identifying the amount of each construction material used in the roof. Multiply the length by the width to get the measurement for the area. 3 stud construction standard utility.

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. This is the sixth video in the series on the timber framing code. 15 psf x 14ft 210 pounds per lineal foot.

910 pounds per lineal foot. Load limits on the roof of a building. 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. 50 psf x 14ft 700 pounds per lineal foot.

If you want to calculate these values by hand use the following formulas. Roof load width rlw rafter span if placed at midspan otherwise span1 span2. Measure the length and width of the carport to determine the area of the roof in square feet. Roofs are under a lot of pressure.

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. Snow load thickness density the result snow load or the pressure exerted by the snow has the units of kn m or lbs ft. It is often compared to slope but is not exactly the same. Floor joists ceiling joists rafters snow load rafters roof live load deflection limit.

Rlw is used to calculate the sectional size of some roof members and supporting wall. This video looks at roof load width rlw.