Live Load On Permeable Roofing

The standard guide in the u s the asce 7 05 lists weights and stresses for all building materials expressed in pounds per square foot.

Live load on permeable roofing.

Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m 2 in accordance with section 1607 13 2 1 and are applied to the design of structural members arranged so as to create continuity the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces the most unfavorable load effect see section 1607 13 2 for reductions in minimum roof. Roof loads are a downward vertical force on the home. This issue of live load vs. The codes cover single family homes.

Live load and snow load what is the difference and how do i know which one applies. It is one of the major loads in structural design. The north zone middle zone and the south zone are identified on the roof load zone map above. Live loads should be suitably calculated or assumed by the designer based on occupancy levels.

Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched. Arch 331 note set 13 1 s2014abn 2. 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.

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. Load limits on the roof of a building. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of other elements in the load path. Irc provides the minimum codes standards for roof structures and other areas of construction used in most areas of the nation including georgia.

There are two different rafter tables in the irc code book. Georgia residential roof building codes follow the same standards as established by the international residential codes irc. Is 875 part ii 1987 specifies the live loads for following occupancy conditions. Roofs are under a lot of pressure.

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. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.