Residential Roof Live Load

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.

Residential roof live load.

0 9d 1 0e effect or 0 9 when resisting the load when permanent. Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. 1603 1 3 roof snow load. 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.

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. This issue of live load vs. Victor staley a building official in the town of brewster mass responds. 0 9d 1 0w a load factor of 1 6 when adding to load 7.

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. Minimum uniformly distributed live loads adapted from sei asce 7 10. 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. 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. As a result the live load dead load and distribution of forces are different. The live load on a roof is the weight of any temporary objects on the roof. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.

Also whether live load reduction has been applied. 1607 12 1 distribution of roof loads. The ground snow load p gf and the flat roof snow load p and if applicable the sloped roof snow load p s shall. Design loads for residential buildings 3 1 general.

Applied shall be indicated.