Roof Load Width Meaning

Tributary width is 7 ft 5 ft 12 ft.

Roof load width meaning.

The roof load width is half of the rafter span. If you like this video please subscribe to my channel. These diagrams may also be used to determine roof load width for floor joists. Roofs are under a lot of pressure.

The exterior wall and the headers within will carry all loads from the mid point of the house between the supporting walls to the outside of the house including the roof overhang. Tributary loading or tributary width is the accumulation of loads that are directed toward a particular structural member. Rlw is used to calculate the sectional size of some roof members and supporting wall members. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes.

So each lineal foot of wall must carry the loads imposed by a 1 foot wide strip in that 14 ft region. The left wall has 7 ft of tributary width and would receive a load of 700 plf. Load limits on the roof of a building. If you can source a beam of 6 5 mtrs long in one piece the size required would be 240 by 45 in f5 or f7 or mgp 10.

If you have single span rafters of 4 8 mtrs the roof load width is 2 4 mtrs. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. The distance in this case is 12 ft 2 ft 14 ft. This video looks at roof load width rlw.

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. If the load is 100 psf the load to the beam would be 12 ft x 100 psf 1200 plf. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.

However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. You would require three post to cover the 6 5 mtrs of beam length. The north zone design live load equates to 40 pounds per square foot the middle zone equates to 30 pounds per square foot and the south zone equates to 20 pounds per square foot.