Roof Live Load Residential

Gridirons over stages shall be designed to support a uniformly distributed live load of 50 psf 2 40 kn m 2 in addition to the rigging loads indicated.

Roof live load residential.

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the. Design loads for residential buildings 3 1 general. Victor staley a building official in the town of brewster mass responds.

Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. This issue of live load vs. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated. The live load on a roof is the weight of any temporary objects on the roof.

Minimum uniformly distributed live loads adapted from sei asce 7 10. Axial forces from snow loads and roof live loads should usually not be considered simultaneously with an extreme wind load because they are mutually exclusive on residential sloped roofs. Since it is possible to use the attic for storage the live load of the attic floor is set at 20 psf according to code. Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m2 in accordance with section 1607 12 2 1 and are applied to the design of structural members arranged so as to create continulty the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces.

Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems. As a result the live load dead load and distribution of forces are different. 1607 12 1 distribution of roof loads. Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use.

Further in most areas of the united states design winds are produced by either hurricanes or. 0 9d 1 0w a load factor of 1 6 when adding to load 7. 0 9d 1 0e effect or 0 9 when resisting the load when permanent.