Roof Width Load

Load limits on the roof of a building.

Roof width load.

This video looks at roof load width rlw. This is the sixth video in the series on the timber framing code. It is often compared to slope but is not exactly the same. You can enter this value either as a ratio x 12 or as an angle whichever suits you better.

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Roof live loads need not be applied to the area covered by photovoltaic panels where the clear space between the panels and the roof surface is 24 inches 610 mm or less. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

Length and width of your roof. Again this house has the same width dimension but it has 2 levels. 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. Rlw is used to calculate the sectional size of some roof members and supporting wall.

Multiplied by 40 pounds per square foot equals 8 000 pounds. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Multiply the load per square foot by the total area of the roof.

Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest. Applicable uniform and concentrated roof loads with the photovoltaic panel system dead loads. You can enter these values in any units you d like including meters and feet. If your roof is pitched enter the length and width of the flat area covered by the roof.

If an example roof is 10 feet by 20 feet the total area is 200 square feet.