1603 1 2 roof live load.
Roof live load requirements.
The minimum design roof snow load.
The roof live load used in the design shall be indicated 780 cmr 1607 11.
In areas where the ground snow load p exceeds 10 pounds per square foot psf 0 479 kn m2.
Also whether live load reduction has been applied.
In areas of the state outside of certified local government jurisdictions the design snow load shall be based on the ground snow loads developed in snow loads for structural design in montana authored by f f.
The roof live load used in the design shall be indicated for roof areas section 1607 12.
Chapter 3 design loads for residential buildings.
0 9d 1 0e effect or 0 9 when resisting the load when permanent.
The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.
An nahb proposal amended the 2015 ibc to restore the traditional 20psf roof live load requirement for porches patios or canopies on one and two family dwellings but the issue remains for multifamily buildings.
This modification makes two key changes.
The ground snow load p shall be indicated.
1 2d 1 0w l 0 5 l r or s or r 5.
The uniformly distributed concentrated and impact floor live loads used in the design and where they are applied shall be indicated.
1603 1 3 roof snow load.
The load increases with the use of heavier roofing material.
3 20 residential structural design guide.
1603 1 1 floor live load.
Minimum uniformly distributed live loads.
For a larger map with greater detail refer to asce 7 98.
Or s or r l or 0 5w dead load d in 1 through 5 and 7.
Roof connection details roof live load engineered framing specs details for fired rated structural elements flood hazard requirements base flood elevation certification flood proofing damp proofing.
1603 1 3 roof snow load data.
0 9d 1 0w a load factor of 1 6 when adding to load 7.
This downward imposed load on the home is also known as the snow load.
A clay tiled roof may have a dead load.
In areas where the ground snow load is less than 15 psf the minimum roof live load refer to section 3 4 is usually the controlling rgavity load in roof design.
Schilke civil agricultural engineering montana state university august 1989.
The north zone middle zone and the south zone are identified on the roof load zone map above.
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.
