Live Load On Permeable Roofing

Victor staley a building official in the town of brewster mass responds.

Live load on permeable roofing. Roofs are under a lot of pressure. Live loads should be suitably calculated or assumed by the designer based on occupancy levels. It is one of the major loads in structural design. 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.

The north zone middle zone and the south zone are identified on the roof load zone map above. 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. 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. Calculating the load on a flat roof is a challenging task for the layperson that involves knowledge of building materials their weights and local building codes. 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. 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.

Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. Is 875 part ii 1987 specifies the live loads for following occupancy conditions. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched. Roof loads are a downward vertical force on the home.

Arch 331 note set 13 1 s2014abn 2. This downward imposed load on the home is also known as the snow load. This issue of live load vs. The codes cover single family homes.

The minimum live loads per square meter area for different types of structures are given in is 875 part 2 1987. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.