Roof Width Load

Length and width of your roof.

Roof width load.

This number represents the total load that your roof must carry. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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. Multiply the load per square foot by the total area of the roof.

Loads are contributed to the lower header by the roof upper walls and 2nd floor system. You can enter these values in any units you d like including meters and feet. 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. 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.

Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. It is often compared to slope but is not exactly the same. Roofs are under a lot of pressure. Again this house has the same width dimension but it has 2 levels.

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. Load limits on the roof of a building. Applicable uniform and concentrated roof loads with the photovoltaic panel system dead loads. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

This is the sixth video in the series on the timber framing code. If an example roof is 10 feet by 20 feet the total area is 200 square feet. This video looks at roof load width rlw. Multiplied by 40 pounds per square foot equals 8 000 pounds.

Rlw is used to calculate the sectional size of some roof members and supporting wall.