This downward imposed load on the home is also known as the snow load.
Roof load width explained.
The snow load is treated as a live load when you use af pa s tables.
The dead load on a roof includes the framing sheathing and roofing material along with any other permanent construction that rests directly on the roof and transmits its weight load through the.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
This zone accounts for about 5 of the roof surface represented the corners of the roof.
The entire roof load is supported by load bearing walls which in turn transfer weight to the foundations of your home.
These diagrams may also be used to determine roof load width for floor joists.
The north zone middle zone and the south zone are identified on the roof load zone map above.
2 you must determine the snow load for your region.
This information is found in the code book.
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.
The span would be 11 5 3 4.
Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run.
In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.
Used for roof overhang area along the perimeter of zone 2.
Used for roof overhang area along the perimeter of zone 3.
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.
Spacing should be interpreted as the centre to centre distance between adjacent parallel members.
Has the highest load.
Trusses struts and props.
So consider a simple gable roof on a 24 foot wide ranch framed with 2 6 exterior walls and a 1 1 2 ridge.
Any areas between the wall corners that are not included within zone 5.
