Roof Live Load Requirements

This downward imposed load on the home is also known as the snow load.

Roof live load requirements.

The north zone middle zone and the south zone are identified on the roof load zone map above. 1603 1 3 roof snow load. The minimum design roof snow load. 0 9d 1 0e effect or 0 9 when resisting the load when permanent.

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. 1603 1 2 roof live load. The roof live load used in the design shall be indicated 780 cmr 1607 11. For a larger map with greater detail refer to asce 7 98.

The uniformly distributed concentrated and impact floor live loads used in the design and where they are applied shall be indicated. 1 2d 1 0w l 0 5 l r or s or r 5. Minimum uniformly distributed live loads. 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 dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. Chapter 3 design loads for residential buildings. 0 9d 1 0w a load factor of 1 6 when adding to load 7. A clay tiled roof may have a dead load.

1603 1 2 roof live load. 1603 1 3 roof snow load data. 3 20 residential structural design guide. In areas where the ground snow load p exceeds 10 pounds per square foot psf 0 479 kn m2.

1603 1 1 floor live load. The load increases with the use of heavier roofing material. This modification makes two key changes. 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.

Or s or r l or 0 5w dead load d in 1 through 5 and 7. For each type of live load used in the design. Schilke civil agricultural engineering montana state university august 1989. 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.

1 2d 1 0e l 0 2s when h loads are present they shall have 6. Also whether live load reduction has been applied.