TABLE 1604.3DEFLECTION LIMITS
a, b, c, h, i
S or W f
D + Ld,g
Roof members:e Supporting plaster ceiling Supporting non-plaster ceiling Not supporting Ceiling Floor membersExterior walls and interior partitions: With brittle finishes With flexible finishes Farm buildings Greenhouses
l/360 l/240 l/180 l/360 — — — —
l/360 l/240 l/180 — l/240 l/120 — —
l/240l/180 l/120 l/240 — — l/120
For SI: 1 foot = 304.8 mm. a. For structural roofing and siding made of formed metal sheets, the total load deflection shall not exceed l/60. For secondary roof structuralmembers supporting formed metal roofing, the live load deflection shall not exceed l/150. For secondary wall members supporting formed metal siding, the design wind load deflection shall not exceedl/90. For roofs, this exception only applies when the metal sheets have no roof covering. b. Interior partitions not exceeding 6 feet in height and flexible, folding and portable partitions are notgoverned by the provisions of this section. The deflection criterion for interior partitions is based on the horizontal load defined in Section 1607.13. c. See Section 2403 for glass supports. d. For woodstructural members having a moisture content of less than 16 percent at time of installation and used under dry conditions, the deflection
resulting from L + 0.5D is permitted to be substituted forthe deflection resulting from L + D. e. The above de flections do not en sure against ponding. Roofs that do not have sufficient slope or camber to assure adequate drain age shall be investigated forponding. See Section 1611 for rain and ponding requirements and Section 1503.4 for roof drain age requirements. f. The wind load is permitted to be taken as 0.7 times the “component and cladding”loads for the purpose of determining deflection limits herein. g. For steel structural members, the dead load shall be taken as zero. h. For aluminum structural members or aluminum panels used in roofs...
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