Page 327 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch07.qxd 9/29/05 5:16 PM Page 7.11

FLOOR AND ROOF SYSTEMS

FLOOR AND ROOF SYSTEMS 7.11

FIGURE 7.11 Typical anchor clip for standing-seam roof deck.

in the American Iron and Steel Institute’s “North American Specification for the Design of Cold-
Formed Steel Structural Members.” (See Art. 9.12.4.)

7.5 LIGHTWEIGHT PRECAST-CONCRETE ROOF PANELS

Roof decks of lightweight precast-concrete panels typically span 5 to 10 ft between supports. Panel
thicknesses range from 2 to 4 in, and widths are usually 16 to 24 in. Depending on the product, con-
3
crete density can vary from 50 to 115 lb per ft . Certain types of panels have diaphragm capacities
depending on the edge and support connections used. Many panels can achieve a fire rating when
used as part of an approved ceiling assembly.
The panels are typically attached to steel framing with cold-formed-steel clips (see Fig. 7.12). The
joints between panels are cemented on the upper side, usually with an asphaltic mastic compound.
Insulation and roofing materials are normally placed on top of the panels. Some panels are nailable
for application of certain types of roof finishes, such as slate, tile, and copper.

FIGURE 7.12 Typical clips for attachment of lightweight precast-concrete panels to steel framing.
The clips are driven into place for a wedge fit at diagonal corners of the panels. Minimum flange width
for supporting member is preferably 4 in.

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