Roof Live Load Residential

Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.

Roof live load residential. Design loads for residential buildings 3 1 general. Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. As a result the live load dead load and distribution of forces are different.

Cold weather loads snow typically applied to exposed roofs or decks ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave condition where soil under footing freezes and exerts upward movement on the foundation bottom of footings must be below frost depth to avoid this. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated. 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. 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.

1607 12 1 distribution of roof loads. 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. 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. Minimum uniformly distributed live loads adapted from sei asce 7 10.

The live load on a roof is the weight of any temporary objects on the roof. 1607 3 uniform live loads the live loads used in the design of buildings and other structures shall be the maximum loads expected by the intended use or occupancy but shall in no case be less. Victor staley a building official in the town of brewster mass responds. Further in most areas of the united states design winds are produced by either hurricanes or.

Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems. This issue of live load vs. 0 9d 1 0w a load factor of 1 6 when adding to load 7.