1、Designation: C 840 08Standard Specification forApplication and Finishing of Gypsum Board1This standard is issued under the fixed designation C 840; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、 in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification covers the minimum requirements forthe m
3、ethods of application and finishing of gypsum board,including related items and accessories.1.2 Details of construction for a specific assembly toachieve the required fire resistance shall be obtained fromreports of fire-resistance tests, engineering evaluations, orlistings from recognized fire test
4、ing laboratories.1.2.1 Where this specification is more stringent (size orthickness of framing: size and spacing of fasteners) than thefire-rated construction, this specification shall govern.1.3 Where sound control is required for a gypsum boardassembly, details of construction shall be in accordan
5、ce withreports of acoustical tests of assemblies that have met therequired acoustical values.1.4 Unheated spaces above gypsum board ceilings shall beproperly ventilated (seeAppendix X2).1.5 The various application systems are located in thefollowing sections:I Application of Single-Ply Gypsum Board
6、to Wood FramingMembers8II Application of Two-Ply Gypsum Board to Wood FramingMembers9III Application of Gypsum Board by Adhesive Nail-On toWood Framing Members10IV Semi-Solid Gypsum Board Partitions 11V Solid Gypsum Board Partitions 12VI Application of Gypsum Board with Adhesives to InteriorMasonry
7、or Concrete Walls13VII Application of Gypsum Board to Rigid Foam Insulation 14VIII Application of Gypsum Board to Steel Framing and Furring 15IX Arches and Bending Radii 16X Application of Gypsum Board to Receive Tile byAdhesive Application17XI Exterior Application of Gypsum Wallboard andExterior Gy
8、psum Soffit Board18XII Floating Interior Angles 19XIII Control (Expansion) Joints 20XIV Foil-Backed Gypsum Board 21The values stated in inch-pound units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand ar
9、e not considered standard.1.6 The text of this specification references notes andfootnotes which provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the specification.1.7 The following precautionary caveat pertains
10、only toSections 6-24. This standard does not purport to address all ofthe safety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to u
11、se.1.7.1 For specific precautionary statements, see 4.1.1, 4.1.2,and 22.5.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Build-ing Materials and SystemsC 475/C 475M Specification for Joint Compound and JointTape for Finishing Gypsum BoardC 514 Specification
12、 for Nails for the Application of Gyp-sum BoardC 557 Specification for Adhesives for Fastening GypsumWallboard to Wood FramingC 645 Specification for Nonstructural Steel Framing Mem-bersC 754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC 92
13、0 Specification for Elastomeric Joint SealantsC 954 Specification for Steel Drill Screws for the Applica-tion of Gypsum Panel Products or Metal Plaster Bases toSteel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84mm) in ThicknessC 1002 Specification for Steel Self-Piercing TappingScrews for the Ap
14、plication of Gypsum Panel Products or1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.03 on Specifications for theApplication of Gypsum and OtherProducts in Assemblies.Current e
15、dition approved May 1, 2008. Published June 2008. Originallyapproved in 1979. Last previous edition approved in 2007 as C 840 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
16、on, refer to the standards Document Summary page onthe ASTM website.1*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.Metal Plaster Bases to Wood Studs or Steel StudsC 1
17、007 Specification for Installation of Load Bearing(Transverse and Axial) Steel Studs and Related Accesso-riesC 1047 Specification for Accessories for Gypsum Wall-board and Gypsum Veneer BaseC 1396/C 1396M Specification for Gypsum BoardC 1546 Guide for Installation of Gypsum Products in Con-cealed Ra
18、diant Ceiling Heating Systems2.2 U.S. Department of Commerce Publication:PS20 American Softwood Lumber Standard32.3 ANSI Standard:ANSI A 136.1 Organic Adhesives for Installation of Ce-ramic Tile, Type I and Type II43. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3
19、.2 Descriptions of Terms Specific to This Standard:3.2.1 all-purpose compound, na compound formulatedand manufactured to serve as a taping or finishing compound,or both.3.2.2 critical lighting, na condition where interior sur-faces are flooded by natural or artificial lighting at an obliqueangle.3.2
20、.3 decoration, npaint (including primers), texture,coatings, and coverings such as wallpaper and sheet plasticmaterials designed to conceal or protect the surface of thegypsum board (see Appendix X3).3.2.4 dry type, na compound in powder form to be mixedwith water before use.3.2.5 drying type, na co
21、mpound that hardens by theevaporation of the vehicle used to make the paste.3.2.6 drywall primer, na paint material specifically for-mulated to fill the pores and minimize the suction differencebetween gypsum board surface paper and the compound usedon finished joints, angles, fastener heads and acc
22、essories, andover skim coatings.3.2.7 face panel, noutside ply of multiple layer gypsumboard assemblies.3.2.8 finished wallboard, nwallboard that has had thejoints taped, has had the joints, fastener heads, and flanges ofaccessories concealed with joint compound, and has beensanded to prepare the su
23、rface to receive job applied decoration.3.2.9 finishing, nthe preparation of gypsum board sur-faces to receive the field application of decoration.3.2.10 finishing compound (sometimes called topping com-pound), na compound used for successive coats over thetaping or all-purpose compound that provide
24、s a smooth andlevel surface for the application of decoration.3.2.11 finishing of accessories, nthe application of com-pound to flanges of accessories to create a monolithic surface.3.2.12 flange, nthat part of an accessory extending overthe face of the gypsum wallboard intended to become a part oft
25、he monolithic plane of the prepared surface.3.2.13 framing member, nthat portion of the framing,furring, and blocking to which the gypsum board is attached.3.2.14 harden, va condition reached when the compoundhas lost its plasticity to an arbitrary degree, measured inresistance to penetration or def
26、ormation.3.2.15 joint photographing, na condition where the fin-ished joint areas visible after final decoration.3.2.16 joint tape, na strip of material designed to beembedded in compound to reinforce joints, cracks, or othersmall openings in or between gypsum boards.3.2.17 joint treatment, napplica
27、tion of joint tape andcompound to the joint between gypsum boards.3.2.18 laminating compound, na compound (abrasive)used to adhere gypsum board to gypsum board or othermonolithic materials.3.2.19 moderate contact, nthe edges and ends are buttedat joints but not forced together.3.2.19.1 DiscussionSma
28、ll gaps not greater than14 in. (6mm) are acceptable (see 7.4)3.2.20 parallel or vertical application, ngypsum boardapplied with the edges parallel to the framing member to whichit is attached.3.2.21 perpendicular or horizontal application, ngypsumboard application with the edges applied at right ang
29、les to theframing member to which it is attached.3.2.22 ready-mix type, na factory-prepared compoundready to be used without the addition of water.3.2.23 required, adjpertaining to a mandatory obligationimposed by a force outside this standard, such as a buildingcode, project specification, contract
30、, or purchase order.3.2.24 setting type, na compound that hardens by achemical reaction and increases in straight through drying.3.2.25 skim coat, na thin layer of skim coat compoundapplied over the entire surface of finished gypsum board.3.2.25.1 DiscussionA skim coat is essentially a film ofjoint
31、compound and is not applied at a readily measurablethickness. There is no specific mil thickness that constitutes aproper skim coat (See Appendix X8).3.2.26 skim coat compound, njoint compound, or a ma-terial specifically formulated and manufactured for use as askim coat.3.2.27 specified, adjpertain
32、ing to a mandatory require-ment of this standard or a referenced requirement (see 3.2.21).3.2.28 spotting fastener heads, nthe application of com-pound to cover the fastener head to create a monolithic surface.3.2.29 taping compound (sometimes called embedding com-pound), na compound used for embedd
33、ing and bonding jointtape and for the first coat over the heads of fasteners andflanges of accessories.3.2.30 taping of joints, nthe application of compound andjoint reinforcing tape to the joints between adjoining gypsumboards.3.2.31 treated joint, na joint between gypsum boards thathas been covere
34、d with joint tape and joint compound asspecified in 22.3.3.1, 22.3.3.2,or22.3.3.3.3.2.31.1 DiscussionStrip moldings or similar devicesshall be permitted.3Available from U.S. Government Printing Office, Washington, DC 20402.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
35、4th Floor, New York, NY 10036, http:/www.ansi.org.C8400824. Environmental Conditions4.1 Application of Gypsum Board, Joint Treatment Materi-als, and AdhesivesRoom temperature shall be maintained atnot less than 40 F (4 C) during application of gypsum boardexcept when adhesive is used for the attachm
36、ent of gypsumboard. For the bonding of adhesive, joint treatment, texturing,and decoration, the room temperature shall be maintained atnot less than 50 F (10 C) for 48 h prior to application andcontinuously thereafter until completely dry.4.1.1 When a temporary heat source is used, the temperaturesh
37、all not exceed 95 F (35 C) in any given room or area.4.1.2 Adequate ventilation shall be maintained in the work-ing area during installation and curing period.4.2 Gypsum board shall be protected from direct exposureto rain, snow, sunlight, or other excessive weather conditions.NOTE 1Where manufactur
38、ers recommendations differ from theabove, follow their recommendations.4.3 Ready-mixed joint compounds shall be protected fromfreezing, exposure to extreme heat, and direct sunlight.5. Materials and Manufacture5.1 Gypsum BoardsAfamily of gypsum sheet products asdefined in Terminology C11.5.1.1 Type
39、X (Special Fire-Resistant) Gypsum Wallboard,Gypsum Backing Board, Water-Resistant Gypsum BackingBoard, or Exterior Gypsum Sofft BoardGypsum board thatprovides a greater degree of fire resistance than regular gypsumboard as defined in Specification C 1396/C 1396M.5.1.2 Foil-Backed Gypsum Wallboard or
40、 Gypsum BackingBoardRegular or Type X gypsum board with foil laminatedto the back surface. The foil is a vapor retarder.5.1.3 Predecorated Gypsum BoardGypsum board with adecorative wall covering or coating applied in-plant by thegypsum board manufacturer.5.2 Gypsum Wallboard See Specification C 1396
41、/C 1396M.5.3 Gypsum Backing Board and CoreboardSee Specifi-cation C 1396/C 1396M.5.4 Water-Resistant Gypsum Backing BoardSee Specifi-cation C 1396/C 1396M.5.5 Exterior Gypsum Sofft BoardSee SpecificationC 1396/C 1396M.5.6 Gypsum Ceiling BoardSee Specification C 1396/C 1396M.5.7 Finishing Materials:5
42、.7.1 CompoundsTaping compound, finishing compound,and all-purpose compound shall meet the requirements ofSpecification C 475/C 475M.5.7.2 Mix compounds in accordance with the manufactur-ers directions.5.7.3 Joint TapeSee Specification C 475/C 475M.5.8 Fasteners:5.8.1 NailsSee Specification C 514.5.8
43、.2 Screws:5.8.2.1 See Specification C 1002 for screws for fasteninggypsum board to wood members, steel members less than 0.03in thickness, and to gypsum board.5.8.2.2 See Specification C 754 and Specification C 954 forscrews for fastening gypsum board to steel members from0.033 to 0.112 in. in thick
44、ness.5.8.3 StaplesNo. 16 USS gage flattened galvanized wirestaples with716-in. (11.1-mm) wide crown outside measure-ment. Legs shall have divergent points.NOTE 2Use only for the base ply of two-ply gypsum board applica-tion.5.9 Adhesives:5.9.1 Fastening Gypsum Board to Wood FramingSeeSpecification C
45、 557.5.9.2 Fastening Gypsum Board to Steel FramingAsspecified by the manufacturer.5.9.3 Laminating Gypsum Board to Gypsum BoardLaminating compounds, taping compound, or adhesive shall beas specified by the manufacturer.NOTE 3Adhesives for the installation of ceramic tile, see AppendixX4.5.10 Framing
46、 Members:5.10.1 Wood framing members shall conform to PS20,American Softwood Lumber Standards. The surface to whichabutting edges or ends are attached shall be not less than 112in. (38.1 mm) wide. For internal corners or angles, the bearingsurface shall not be less than34 in. (19.1 mm).5.10.2 Steel
47、Studs, Furring Channels, and Runners, Non-Load BearingSee Specification C 645.5.10.3 Gypsum Studs Specification C 1396/C 1396M, notless than 1 in. (25.4 mm) thick by 6 in. (152 mm) wide. Studsshall be either solid or laminated.5.11 AccessoriesSee Specification C 1047.5.12 WaterWater shall be clean,
48、fresh, and potable (suit-able for domestic consumption).5.13 Face PanelsFace panels shall be12 in. (12.7 mm),58in. (15.9 mm), or multiple laminations of regular or Type Xgypsum board.5.14 Core BoardCore board shall be34 in. (19.1 mm) or1 in. (25.4 mm) either single thickness or multiple layers to th
49、erequired thickness.6. Substrate, Surface Preparation6.1 The attachment surface of any framing member shall notvary more than18 in. (3.2 mm) from the plane of the faces ofadjacent framing members.6.2 Wood framing shall be as straight and true as possible.Wood framing shall be securely attached following acceptableengineering practices and as required for the intended design.NOTE 4For installation of wood framing, see Appendix X5.6.3 Metal framing members shall be of the proper size anddesign for their in
