Roof Load Width Explained

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Roof load width explained.

This zone accounts for about 5 of the roof surface represented the corners of the roof. Load limits on the roof of a building. Used for roof overhang area along the perimeter of zone 3. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

These diagrams may also be used to determine roof load width for floor joists. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. The entire roof load is supported by load bearing walls which in turn transfer weight to the foundations of your home. Most commonly the roof s internal support structure is composed of a fairly complicated system of structural elements designed to manage the load from the roof.

So consider a simple gable roof on a 24 foot wide ranch framed with 2 6 exterior walls and a 1 1 2 ridge. The span would be 11 5 3 4. The north zone middle zone and the south zone are identified on the roof load zone map above. This downward imposed load on the home is also known as the snow load.

Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Used for roof overhang area along the perimeter of zone 2. This information is found in the code book. Spacing should be interpreted as the centre to centre distance between adjacent parallel members.

Trusses struts and props. Roofs are under a lot of pressure. Any areas between the wall corners that are not included within zone 5. The snow load is treated as a live load when you use af pa s tables.

Has the highest load.