Roof Live Load Vs Live Load

The north zone middle zone and the south zone are identified on the roof load zone map above.

Roof live load vs live load.

Live loads are temporary loads. The live load on a roof is the weight of any temporary objects on the roof. They are applied to the structure on and off over the life of the structure. The dead loads are permanent loads which result from the weight of the structure itself or from other permanent attachments for example drywall roof sheathing and weight of the truss.

Roof and floor live loads are produced during maintenance by workers equipment and materials and during the life of the structure by movable objects such as planters and people. This downward imposed load on the home is also known as the snow load. 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. The north zone design live load equates to 40 pounds per square foot.

Minimum design live load can be found in asce 7 table 4 1 or ibc table 1607 1. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. But when we discuss roofs these days live loads are generally associated with the weight that the roof structure might be asked to endure while the roof is under construction or renovation reroofing. Using the term live loads when referring to roofs might make you scratch your head initially because roofs unlike floors aren t asked to bear the weight of things such as furniture and occupants of a home what you would normally think of as a live load.

They represent the transient forces that can be moved through the building or act on any particular structural element. However a south roof load zone home cannot be installed in either a middle or north roof load zone. Live loads refer to the dynamic forces from occupancy and intended use. 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.

Also measured in psf these loads include the anticipated weight of people furniture appliances automobiles moveable equipment and the like. Arch 331 note set 13 1 s2014abn 2.