1.5.4
Tolerances
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NOTE: The finished wall system requires the
coordination and efforts of many different
manufacturers, suppliers, and construction trades.
Contractor submittal requirements should include
sufficient detail to insure coordination between
them.
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Design and erect wall system to accommodate tolerances in building frame
and other contiguous work as indicated or specified. Provide with the
following tolerances:
a.
Maximum variation from plane or location shown on approved shop
drawings: one millimeter per 12 meters 1/8 inch per 12 feet of
length up to not more than 13 mm 1/2 inch in any total length.
b.
Maximum offset from true alignment between two identical members
abutting end to end in line: 2 mm 1/16 inch.
1.5.5
Structural Requirements
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NOTE: When mullions are used to support window
cleaning rigs, the loads on the mullion members
created by the rigs must be considered in the
mullion design and the appropriate figures listed in
blank spaces.
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No member shall deflect in a direction parallel to the plane of the wall,
when carrying its full design load, more than an amount which will reduce
the edge cover or glass bite below 75 percent of the design dimension. No
member after deflection under full design load, shall have a clearance
between itself and the top of the panel, glass, sash, or other part
immediately below it less than 3 mm 1/8 inch; the clearance between the
member and an operable window or door shall be minimum 2 mm 1/16 inch.
[Design system members serving as guide rails for window cleaning equipment
to carry mid-span concentrated load of [_____] kilograms pounds normal to
plane of wall and [_____] kilograms pounds applied horizontally, parallel
to wall plane without deflection which would affect adjacent surfaces.]
Design entire system to withstand the indicated wind and concentrated
loads, and the following wind loads acting normal to the plane of the wall:
a.
On the first [_____] stories above grade [_____] kPa psf acting
inward, and the same load acting outward.
b.
On the next [_____] stories above grade [_____] kPa psf acting
inward, and the same load acting outward.
c.
On corner areas, extending [_____] meters feet from the building
corners on the [_____] stories, on all facades, the outward-acting
(negative) design load shall be increased to [_____] kilopascals
pounds per square foot.
SECTION 08900
Page 15
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