20 Live Load Roof

I find that code commentaries do a good job of explaining the basis of a code requirement and in the case of section r301 6 the commentary suggests that 20 psf is a pretty severe live load condition and is most likely to be concentrated in a small area of the roof as with a stack of shingle bundles.

20 live load roof.

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. On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof. Factors that influence. Af pa s appendix a lists a variety of live and dead load combinations for floors ceilings and rafters.

The north zone design live load equates to 40 pounds per square foot the middle zone equates to 30 pounds per square foot and the south zone equates to 20 pounds per square foot. 1020 pounds per lineal foot. 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. The uniform design live load in unoccupied landscaped areas on roofs shall be 20 psf 0 958 kn m 2.

10 psf x 14ft 140 pounds per lineal foot. R live roof load symbol lrfd load and resistance factor design r rainwater load or ice water load symbol s snow load symbol. For example appendix a indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf. 1607 13 4 awnings and canopies.

The north zone middle zone and the south zone are identified on the roof load zone map above. The uniform design live load for occupied landscaped areas on roofs shall be determined in accordance with table 1607 1. Many factors influence how a system responds to loading. 10 psf x 6ft 60 pounds per lineal foot.

For roof live loads of 12 psf or 16 psf. The loads are based on adjusted roof snow loads from the governing building code. 20 psf x 6ft 120 pounds per lineal foot. 20 0 96 30 1 44 40 1 92 40 1 92 100 4 79 arch 331 note set 13 1 s2014abn 5 location 2uniform load psf kn m roofs.