Roof Live Load Requirements

0 9d 1 0w a load factor of 1 6 when adding to load 7.

Roof live load requirements.

The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. The north zone middle zone and the south zone are identified on the roof load zone map above. This downward imposed load on the home is also known as the snow load. 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.

1603 1 2 roof live load. 1603 1 1 floor live load. This modification makes two key changes. Chapter 3 design loads for residential buildings.

0 9d 1 0e effect or 0 9 when resisting the load when permanent. 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 roof live load used in the design shall be indicated 780 cmr 1607 11. 3 20 residential structural design guide.

The ground snow load p shall be indicated. 1603 1 3 roof snow load. For each type of live load used in the design. The uniformly distributed concentrated and impact floor live loads used in the design and where they are applied shall be indicated.

Or s or r l or 0 5w dead load d in 1 through 5 and 7. The load increases with the use of heavier roofing material. The minimum design roof snow load. 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.

1 2d 1 0w l 0 5 l r or s or r 5. For a larger map with greater detail refer to asce 7 98. Schilke civil agricultural engineering montana state university august 1989. 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.

Minimum uniformly distributed live loads. 1603 1 2 roof live load. 1603 1 3 roof snow load data. In areas where the ground snow load p exceeds 10 pounds per square foot psf 0 479 kn m2.

A clay tiled roof may have a dead load. The roof live load used in the design shall be indicated for roof areas section 1607 12.