Roof Live Load Requirements

For each type of live load used in the design.

Roof live load requirements.

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. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. 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. A clay tiled roof may have a dead load.

The load increases with the use of heavier roofing material. Schilke civil agricultural engineering montana state university august 1989. The uniformly distributed concentrated and impact floor live loads used in the design and where they are applied shall be indicated. 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.

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. Or s or r l or 0 5w dead load d in 1 through 5 and 7. 1603 1 1 floor live load. The roof live load used in the design shall be indicated for roof areas section 1607 12.

This modification makes two key changes. For a larger map with greater detail refer to asce 7 98. 1603 1 3 roof snow load. 3 20 residential structural design guide.

1 2d 1 0w l 0 5 l r or s or r 5. Minimum uniformly distributed live loads. The roof live load used in the design shall be indicated 780 cmr 1607 11. 1 2d 1 0e l 0 2s when h loads are present they shall have 6.

1603 1 3 roof snow load data. 0 9d 1 0w a load factor of 1 6 when adding to load 7. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. This downward imposed load on the home is also known as the snow load.

1603 1 2 roof live load. 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. The north zone middle zone and the south zone are identified on the roof load zone map above. The minimum design roof snow load.

1603 1 2 roof live load. The ground snow load p shall be indicated.