ASTM C955-11b

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Designation: C955 – 11b
Standard Specification for
Load-Bearing (Transverse and Axial) Steel Studs, Runners
(Tracks), and Bracing or Bridging for Screw Application of
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Gypsum Panel Products and Metal Plaster Bases
This standard is issued under the fixed designation C955; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* C11 TerminologyRelatingtoGypsumandRelatedBuilding
Materials and Systems
1.1 This specification covers steel studs, runners (tracks),
C954 Specification for Steel Drill Screws for the Applica-
and bracing or bridging (with a base steel minimum thickness
tion of Gypsum Panel Products or Metal Plaster Bases to
ofnotlessthan0.0329in.(0.836mm))forscrewapplicationof
Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84
gypsum panel products and metal plaster bases in load-bearing
mm) in Thickness
(transverse and axial) construction assemblies. Steel of lesser
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2.2 AISI Standard:
thickness shall be permitted in additional engineered products.
S100 NorthAmerican Specification for the Design of Cold-
1.2 The values stated in inch-pound units are to be regarded
Formed Steel Structural Members
as standard. The values given in parentheses are mathematical
S200 North American Standard for Cold-Formed Steel
conversions to SI units that are provided for information only
Framing – General Provisions – 2007 Edition
and are not considered standard.
1.3 The following precautionary caveat pertains only to the
3. Terminology
test method portion, Section 8, of this specification: This
3.1 Definitions: Definitions shall be in accordance with
standard does not purport to address all of the safety concerns,
Terminology C11.
if any, associated with its use. It is the responsibility of the user
3.2 Definitions of Terms Specific to This Standard:
of this standard to establish appropriate safety and health
3.2.1 members, n—studs, runners, tracks, bracing, bridging,
practices and determine the applicability of regulatory limita-
accessories or other items manufactured in accordance with
tions prior to use.
this standard.
2. Referenced Documents 3.2.2 structural member, n—a member in a steel framed
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system in which the loading exceeds any of the following
2.1 ASTM Standards:
conditions: a transverse load of 20 lbf/ft (290 N/m) of member
A653/A653M Specification for Steel Sheet, Zinc-Coated
length, or an axial load, exclusive of sheathing, of 200 lbf (890
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
N) per member.
by the Hot-Dip Process
A792/A792M Specification for Steel Sheet, 55 %
4. Materials and Manufacture
Aluminum-Zinc Alloy-Coated by the Hot-Dip Process
4.1 Members shall be manufactured from steel meeting the
A875/A875M Specification for Steel Sheet, Zinc-5 % Alu-
requirements of Specification A1003/A1003M.
minum Alloy-Coated by the Hot-Dip Process
4.2 The minimum steel thickness (base steel) shall be not
A1003/A1003M Specification for Steel Sheet, Carbon,
less than 0.0329 in. (0.84 mm).
Metallic- and Nonmetallic-Coated for Cold-Formed Fram-
4.3 Individual measurements before the application of pro-
ing Members
tective coating shall be not less than 95 % of the specified
design thickness.
4.4 Members shall have a protective coating in accordance
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This specification is under the jurisdiction of ASTM Committee C11 on
with Table 1, CP 60 minimum.
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
4.5 Edges of members shall be manufactured to minimize
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products.
burrs and sharp edges.
Current edition approved Oct. 1, 2011. Published October 2011. Originally
4.6 Factory punch-outs, when provided, shall be located
approved in 1981. Last previous edition approved in 2011 as C955–11a. DOI:
along the centerline of the webs of members and shall have
10.1520/C0955-11B.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from American Iron and Steel Institute (AISI), 1140 Connecticut
the ASTM website. Ave., NW, Suite 705, Washington, DC 20036, http://www.steel.org.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C955 – 11b
TABLE 1 Coating Designations
Minimum Coating Requirements
Coating Coating
A B C D
Zinc-Coated Zinc Iron 55 % Al
...