By Donald Breyer, Kelly Cobeen, Kenneth Fridley, David Pollock Jr.
* The best-selling textual content and reference on wooden constitution design
* accommodates the newest nationwide layout necessities, the 2003 foreign development Code and the newest details on wind and seismic so much
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Additional resources for Design of Wood Structures-ASD
Typical occupancy or use ﬂoor live loads range from a minimum of 40 psf for residential structures to values as high as 250 psf for heavy storage facilities. These Code unit live loads are for members supporting small inﬂuence areas. A small inﬂuence area is deﬁned as 400 ft2 or less. From previous discussion of inﬂuence areas, it will be remembered that the magnitude of the unit live load can be reduced as the size of the inﬂuence area increases. 1. 4L0 for members supporting loads from two or more ﬂoors.
Slightly conservative (larger) estimates are preferred for design. The estimation of the dead load of a structure requires some knowledge of the methods and materials of construction. A ‘‘feel’’ for what the unit dead loads of a wood-frame structure should total is readily developed after exposure to several buildings of this type. The dead load of a typical wood ﬂoor or roof system usually ranges between 7 and 20 psf, depending on the materials of construction, span lengths, and whether a ceiling is suspended below the ﬂoor or roof.
Ceiling supports (2 ϫ 4 at 24 in. ) Ceiling (1⁄2-in. 0 psf *Uniform partition loads are required when the location of partitions is unknown or subject to change. 1, the load titled ‘‘rerooﬁng’’ is sometimes included to account for the weight of rooﬁng that may be added at some future time. Subject to the approval of the local building ofﬁcial, new rooﬁng materials may sometimes be applied without the removal of the old roof covering. , built-up, asphalt shingle, wood shingle), one or two overlays may be permitted.