The north zone middle zone and the south zone are identified on the roof load zone map above.
Roof live load requirements.
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 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.
1603 1 2 roof live load.
For a larger map with greater detail refer to asce 7 98.
0 9d 1 0e effect or 0 9 when resisting the load when permanent.
1 2d 1 0w l 0 5 l r or s or r 5.
1603 1 2 roof live load.
The roof live load used in the design shall be indicated 780 cmr 1607 11.
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.
Chapter 3 design loads for residential buildings.
Schilke civil agricultural engineering montana state university august 1989.
3 20 residential structural design guide.
1603 1 3 roof snow load data.
Or s or r l or 0 5w dead load d in 1 through 5 and 7.
This downward imposed load on the home is also known as the 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.
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.
A clay tiled roof may have a dead load.
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.
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 roof live load used in the design shall be indicated for roof areas section 1607 12.
For each type of live load used in the design.
Also whether live load reduction has been applied.
The ground snow load p shall be indicated.
Minimum uniformly distributed live loads.
0 9d 1 0w a load factor of 1 6 when adding to load 7.
1 2d 1 0e l 0 2s when h loads are present they shall have 6.
