20 Live Load Roof

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Af pa s appendix a lists a variety of live and dead load combinations for floors ceilings and rafters.

20 live load roof.

The north zone middle zone and the south zone are identified on the roof load zone map above. 20 psf x 6ft 120 pounds per lineal foot. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. 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.

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. This downward imposed load on the home is also known as the snow load. 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. 1020 pounds per lineal foot.

10 psf x 14ft 140 pounds per lineal foot. 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. 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. The uniform design live load in unoccupied landscaped areas on roofs shall be 20 psf 0 958 kn m 2.

50 psf x 14ft 700 pounds per lineal foot. 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. The uniform design live load for occupied landscaped areas on roofs shall be determined in accordance with table 1607 1. 10 psf x 6ft 60 pounds per lineal foot.

The loads are based on adjusted roof snow loads from the governing building code. For roof live loads of 12 psf or 16 psf. 1607 13 4 awnings and canopies. R live roof load symbol lrfd load and resistance factor design r rainwater load or ice water load symbol s snow load symbol.

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