Roof Live Load Requirements

Or s or r l or 0 5w dead load d in 1 through 5 and 7.

Roof live load requirements.

1603 1 3 roof snow load. 0 9d 1 0w a load factor of 1 6 when adding to load 7. For a larger map with greater detail refer to asce 7 98. 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. A clay tiled roof may have a dead load. The uniformly distributed concentrated and impact floor live loads used in the design and where they are applied shall be indicated. The roof live load used in the design shall be indicated 780 cmr 1607 11.

Chapter 3 design loads for residential buildings. The minimum design roof snow load. This modification makes two key changes. Also whether live load reduction has been applied.

For each type of live load used in the design. 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. The north zone middle zone and the south zone are identified on the roof load zone map above. 1603 1 1 floor live load.

1 2d 1 0e l 0 2s when h loads are present they shall have 6. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. 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. Schilke civil agricultural engineering montana state university august 1989.

1603 1 2 roof live load. The roof live load used in the design shall be indicated for roof areas section 1607 12. 1603 1 2 roof live load. Minimum uniformly distributed live loads.

1603 1 3 roof snow load data. 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. This downward imposed load on the home is also known as the snow load. 3 20 residential structural design guide.

1 2d 1 0w l 0 5 l r or s or r 5. In areas where the ground snow load p exceeds 10 pounds per square foot psf 0 479 kn m2.