1、Designation:C128009 Designation: C1280 11Standard Specification forApplication of Gypsum Sheathing1This standard is issued under the fixed designation C1280; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers the minimum requirements for and methods of application of gypsum sheathing for use as asubstrate for ex
3、terior wall cladding.1.2 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports offire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.1.2.1 This specification shall govern where it is mo
4、re stringent (size or thickness of framing and size and spacing of fasteners)than the fire-rated construction.1.3 Where sound control is required for a gypsum sheathing assembly, the details of construction shall be in accordance withthe acoustical test report of an assembly that has met the require
5、d acoustical value(s).1.3.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)than the sound-rated construction.1.4 Where resistance to racking loads or shear is required for a gypsum sheathing assembly, the details of construc
6、tion shall bein accordance with the racking or shear test report of an assembly that has met the required racking or shear value(s).1.4.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)than the racking or shear-tested constr
7、uction.1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.6 The text of this standard references footnotes which provide explanatory
8、 material. These footnotes shall not be consideredas requirements of the standard.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and d
9、etermine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Building Materials and SystemsC954 Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to St
10、eel Studsfrom 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in ThicknessC955 Specification for Load-Bearing (Transverse and Axial) Steel Studs, Runners (Tracks), and Bracing or Bridging for ScrewApplication of Gypsum Panel Products and Metal Plaster BasesC1002 Specification for Steel Self-Piercing Tapp
11、ing Screws for the Application of Gypsum Panel Products or Metal PlasterBases to Wood Studs or Steel StudsC1007 Specification for Installation of Load Bearing (Transverse and Axial) Steel Studs and Related AccessoriesC1063 Specification for Installation of Lathing and Furring to Receive Interior and
12、 Exterior Portland Cement-Based PlasterC1396/C1396M Specification for Gypsum Board2.2 U.S. Department of Commerce Publication:PS20 American Softwood Lumber Standard31This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the dir
13、ect responsibility ofSubcommittee C11.03 on Specifications for the Application of Gypsum and Other Products in Assemblies.Current edition approved MayDec. 1, 2009.2011. Published May 2009.January 2012. Originally approved in 1994. Last previous edition approved in 20072009 asC1280 079. DOI: 10.1520/
14、C1280-09.10.1520/C1280-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3Available from Standardization D
15、ocuments Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technicall
16、y possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this stand
17、ard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3. Terminology3.1 Definitions: Definitions shall be in accordance with Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 exterior cladding, na permanent materi
18、al or system that impedes the transmission of environmental elements to thesheathing.3.2.2 fastener, nnails, staples, or screws used for application of the sheathing.3.2.3 framing member, nstuds, headers, bracing, and blocking that serve to receive the sheathing.3.2.4 horizontal application, na syno
19、nym for perpendicular application.3.2.5 parallel application, ngypsum sheathing applied with the edges parallel to the framing members; a synonym for verticalapplication.3.2.6 perpendicular application, ngypsum sheathing applied with the edges at right angles to the framing members; asynonym for hor
20、izontal application.3.2.7 require, vto mandate by a force outside this specification, such as a building code, project specification, contract, orpurchase order.3.2.8 specified, adjpertaining to a mandatory requirement of this specification or a referenced requirement.3.2.9 specify, vto mandate by a
21、n obligation of this standard or a referenced document.3.2.10 vertical application, nsynonym for parallel application.3.2.11 weather resistive barrier, na temporarily exposed protective membrane that is intended to impede the penetration ofenvironmental elements until the installation of a permanent
22、 exterior cladding.4. Exposure After Installation4.1 Gypsum sheathing board is a substrate that shall be covered by an exterior cladding or other weather-resistive barrier andis not intended for long-term exposure. It shall not be exposed to the elements for more than 30 days after it has been insta
23、lled.Gypsum sheathing shall be covered with a weather-resistive barrier within 30 days if the exposure time will be more than 30 days.NOTE 1Some building codes require an additional weather-resistive barrier. The exterior face paper of the sheathing shall be dry prior to applicationof the additional
24、 weather-resistive barrier.5. Materials and Manufacture5.1 Gypsum SheathingSpecification C1396/C1396M.5.1.1 Type X (Special Fire-Resistant) Gypsum SheathingGypsum sheathing that provides a greater degree of fire resistancethan regular gypsum sheathing as defined in Specification C1396/C1396M.5.2 Fas
25、tenersFasteners shall be as described in 5.2.1 through 5.2.3. The fastener length shall be not less than that specifiedin Table 1.5.2.1 NailsNails shall be not less than 12-gauge galvanized,716-in. (11.1-mm) diameter head.5.2.2 Screws:5.2.2.1 Screws for fastening gypsum sheathing to wood framing mem
26、bers, and to steel framing members less than 0.033 in.(0.84 mm) in thickness, shall meet the requirements of Specification C1002.5.2.2.2 Screws for fastening gypsum sheathing to steel framing members from 0.033 to 0.112 in. (0.84 to 2.84 mm) in thicknessshall meet the requirements of Specification C
27、954.5.2.2.3Trim-head5.2.2.3 Trim-head screws shall not be permitted for the attachment of gypsum sheathing.5.2.2.4Screws5.2.2.4 Screws for fastening self-furred metal lath over gypsum sheathing as described in 8.2.7 shall be asspecified in Specification C1063.5.2.3 StaplesStaples shall be of galvani
28、zed steel, not less than 16-gauge,716-in. (11.1-mm) wide crown outside measurement.Legs shall have divergent points.5.3 Framing Members:5.3.1 Wood FramingWood framing members shall conform to PS20.TABLE 1 Minimum Fastener LengthsFramingTypeFastenerTypeSheathingThickness, in. (mm)MinimumFastenerLengt
29、h, in. (mm)Wood nails12 (12.7) 112 (38)58 (15.9) 134 (45)screws12 (12.7) 114 (32)58 (15.9) 114 (32)staples12 (12.7) 112 (38)58 (15.9) 134 (45)Steel screws12 (12.7) 1 (25)58 (15.9) 114 (32)C1280 1125.3.2 Steel FramingLoad-bearing steel framing shall meet the requirements of Specification C955.6. Subs
30、trate, Surface Preparation6.1 The maximum spacing for framing members for gypsum sheathing shall be not more than 24 in. (610 mm) on center onwalls.6.1.1 Wood framing shall be straight and true, attached securely following accepted engineering practices and as required forthe intended design. The su
31、rfaces to which abutting edges or ends of gypsum sheathing are to be attached shall be not less than112-in. (38-mm) wide. The bearing surface shall be not less than34 in. (19 mm) for internal corners or angles.6.1.2 Load-bearing metal framing members shall be of the proper size and design for their
32、intended use and shall be installedin accordance with Specification C1007.7. Framing Alignment7.1 Framing members shall be installed so that the surface will be in an even plane, unless otherwise specified, after the gypsumsheathing has been applied.8. Cutting and Application of Gypsum Sheathing8.1
33、Cutting Gypsum Sheathing:8.1.1 The gypsum sheathing shall be cut by scoring and breaking or by sawing, working from the face side. The face paper shallbe cut with a sharp knife or other suitable tool when cutting by scoring. The gypsum sheathing shall be broken by snapping thegypsum sheathing in the
34、 reverse direction or by cutting the back paper with a knife or suitable tool.8.1.2 The cut edges and ends of gypsum sheathing shall be trimmed to obtain neat fitting joints when installed.8.1.3 Holes for pipes, fixtures, or other small openings shall be scored on the face paper before removing the
35、cutout with a sawor special tool designed for this purpose.8.1.4 Where gypsum sheathing meets projecting surfaces, the gypsum sheathing shall be scribed and cut neatly.8.2 Application of Gypsum Sheathing:8.2.1 Gypsum sheathing shall be fitted snugly around all window and door openings.8.2.1.1 Sheath
36、ing joints shall be offset a minimum of 4 in. (100 mm) from the edge of any opening.8.2.1.2 Gypsum sheathing shall be flashed at openings so that water intrusion will not contact the sheathing.8.2.2 All vertical end and edge joints shall abut over the centers of framing members and shall be offset a
37、 minimum of oneframing space between adjacent rows of gypsum sheathing.8.2.3 Control Joints:8.2.3.1 Control joints shall be provided in wall runs exceeding 30 ft (9100 mm) in length. The distance between control jointsshall be not more than 30 ft (9100 mm).8.2.3.2 Control joints shall be installed i
38、n walls wherever there is a building construction joint or where required.8.2.3.3 The location of the control joints shall be as required by either the building design or the exterior cladding specified.8.2.3.4 Control joints, other accessories, and metal plaster base shall be fastened through gypsu
39、m sheathing to framingmembers.8.2.4 Gypsum sheathing, 4-ft (1220-mm) wide, shall be applied either parallel or perpendicular to framing members.8.2.4.1 Square edge gypsum sheathing applied perpendicular to framing members shall be covered with a weather-resistivebarrier, or horizontal joints shall b
40、e sealed.8.2.5 Tongue and groove gypsum sheathing shall be applied with the long dimension perpendicular to framing members, withthe grooved edges down, interlocking the tongue of the panel below without forcing.8.2.6Fasteners shall be spaced not more than 8 in. (203 mm) on center along vertical end
41、s or edges and intermediate supports.The length of fasteners shall be as indicated in8.2.6 Fasteners shall be as specified in either 8.2.6.1 or 8.2.6.2. As an alternate, other fasteners and fastener spacing shall bepermitted when determined to provide sufficient out-of-plane capacity either by calcu
42、lations or tests.8.2.6.1 Fasteners for the application of gypsum sheathing to wood framing shall be spaced not more than 7 in. (178 mm) oncenters along vertical ends or edges and intermediate supports. The length of fasteners shall be as indicated in Table 1.8.2.6.1Fasteners shall be located not les
43、s than388.2.6.2 Fasteners for the application of gypsum sheathing to metal framing shall be spaced not more than 8 in. (203 mm) oncenter along vertical ends or edges and intermediate supports. The length of fasteners shall be as indicated in Table 1.8.2.6.3 Fasteners shall be located not less than38
44、 in. (9.5 mm) from the ends and edges of the gypsum sheathing.8.2.6.24 Gypsum sheathing shall be held tight against the framing when driving fasteners.8.2.6.35 Fasteners shall be driven so that the heads are at or slightly below the surface of the gypsum sheathing without breakingthe face paper or f
45、racturing the core.8.2.6.46 Screws shall be driven without stripping the framing member around the screw shank.8.2.6.57 Staples shall be driven with the crown parallel to the framing member.8.2.7 Application of Gypsum Sheathing Under Self-Furred Metal LathWhere fire resistance or shear resistance is
46、 not required,and when metal lath and portland cement plaster are to be applied as the exterior cladding over gypsum sheathing installed overC1280 113framing members spaced not more than 16 in. (406 mm) on center, and the metal lath shall be installed in accordance withSpecification C1063 within 24
47、h after the gypsum sheathing, the gypsum sheathing shall be permitted to be applied as specifiedin 8.2.7.1 and 8.2.7.2, and fastening of the gypsum sheathing shall be completed with the attachment of the self-furred metal lath.8.2.7.1 For 2-ft (610-mm) wide sheathing installed in accordance with 8.2
48、.5, vertical ends of gypsum sheathing shall be fastenedin accordance with 8.2.6. Gypsum sheathing shall be fastened in place at each intermediate stud with a minimum of two fastenersper board spaced not more than 2 in. (50 mm) from opposite edges.8.2.7.2 For 4-ft (1220-mm) wide sheathing installed i
49、n accordance with 8.2.4, vertical ends or edges of gypsum sheathing shallbe fastened in accordance with 8.2.6. Gypsum sheathing shall be fastened in place at each intermediate stud with fasteners spacednot more than 24 in. (610 mm) on center.9. Keywords9.1 exterior walls; gypsum; sheathingSUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this specification since the last issue,C1280 049, that may impact the use of this specification. (Approved MayDec. 1, 2009)2011)(1) Added new paragraphs 5.2.2.3 and 5.2.
