Roof Live Load In Minnesota

The minnesota department of commerce requested some initial research be completed to identify opportunities for additional load capacities for these roof components.

Roof live load in minnesota.

The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. Arch 331 note set 13 1 s2014abn 2. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched. The required roof snow loads for minnesota aren t clearly spelled out anywhere but the numbers can be found by using table r301 2 1 of the minnesota administrative rules.

Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. However a south roof load zone home cannot be installed in either a middle or north roof load zone. This downward imposed load on the home is also known as the snow load. The roof snow load is a uniform load on the horizontal projection of the roof.

Square footing sizing table. Round footing sizing table. Frost depth map minnesota rules 1303 1600. The north zone design live load equates to 40 pounds per square foot.

Psf pounds per square foot. F the ground snow loads to be used in determining the design snow loads for buildings and other structures are given in minnesota rules part 1303 1700 ground snow load to verify by county. To calculate roof snow load per residential building code. G see minnesota rules chapter 1335 flood proofing regulations.

The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated. Soil classification and bearing table. 0 7 x pg ground snow load pf roof snow load roof snow load examples. Schilke civil agricultural engineering montana state university august 1989.

Roof loads are a downward vertical force on the home. This issue of live load vs. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids. Victor staley a building official in the town of brewster mass responds.

The load increases with the use of heavier roofing material. The minimum design roof snow load. This table says that. The north zone middle zone and the south zone are identified on the roof load zone map above.

Snow load map ground load and roof load map per minnesota rules 1303 1700. A clay tiled roof may have a dead load. 0 7 x 60 psf 42 psf below line. Since the late 1960s and early 1970s roof construction for residential structures has consisted of pre manufactured engineered roof trusses.