Live Load On Permeable Roofing

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

Live load on permeable roofing.

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. 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. Arch 331 note set 13 1 s2014abn 2. 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.

Live load and snow load what is the difference and how do i know which one applies. The codes cover single family homes. Victor staley a building official in the town of brewster mass responds. The north zone middle zone and the south zone are identified on the roof load zone map above.

This downward imposed load on the home is also known as the snow load. Roof loads are a downward vertical force on the home. The minimum live loads per square meter area for different types of structures are given in is 875 part 2 1987. Georgia residential roof building codes follow the same standards as established by the international residential codes irc.

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. This issue of live load vs. 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.

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 standard guide in the u s the asce 7 05 lists weights and stresses for all building materials expressed in pounds per square foot. There are two different rafter tables in the irc code book. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.

Live loads should be suitably calculated or assumed by the designer based on occupancy levels. Roofs are under a lot of pressure.