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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 structural members 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 exceed l/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 not governed 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 wood structural 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 for the deflection resulting
from L + D.
e. The above deflections do not ensure against
ponding. Roofs that do not have sufficient slope
or camber to assure adequate drainage shall be
investigated for ponding. See
Section 1611 for rain and ponding requirements
and Section 1503.4 for
roof drainage 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 skylights and sloped glazing framing,
roofs or walls of sunroom additions or patio covers,
not supporting edge of glass or aluminum sandwich
panels, the total load deflection shall not exceed
1/60. For aluminum sandwich
panels used in roofs or walls of sunroom additions
or patio covers, the total load deflection shall
not exceed 1/120.
i. For cantilever members, l shall
be taken as twice the length of the cantilever.
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