Design loads for residential buildings 3 1 general.
Roof live load residential.
Further in most areas of the united states design winds are produced by either hurricanes or.
The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.
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.
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.
Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.
0 9d 1 0e effect or 0 9 when resisting the load when permanent.
Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems.
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.
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.
0 9d 1 0w a load factor of 1 6 when adding to load 7.
Victor staley a building official in the town of brewster mass responds.
As a result the live load dead load and distribution of forces are different.
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.
Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use.
1607 12 1 distribution of roof loads.
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.
The live load on a roof is the weight of any temporary objects on the roof.
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.
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.
