Roof Live Load Tables

The snow load is treated as a live load when you use af pa s tables. If your code book says your snow load is 40 psf then you use the 40 psf live load rafter table. The loads are based on adjusted roof snow loads from the governing building code.

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The fact that snow loads only act part of the year has been used to create the rafter tables.

Roof live load tables.

Loads should be determined in accordance with this chapter. The live load on a roof is the weight of any temporary objects on the roof. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. Actual load due to snow will depend upon the shape of the roof and its capacity to retain the snow.

And each case shall be treated on its own merits. Where snow isn t a problem the live load can come from people working on the roof and any equipment they. The fact that snow loads only act part of the year has been used to create the rafter tables. For roof live loads less than 20 pounds per square foot psf rafter spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table.

It the roof is subjected to snow load it should be designed for the actual load due to snow or lot the live loads specified in table 1 3 whichever is more severe. For roof live loads of 12 psf or 16 psf. If your code book says your snow load is 40 psf then you use the 40 psf live load rafter table. The snow load is treated as a live load when you use awc s tables.

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.