1、Designation: C840 16Standard Specification forApplication and Finishing of Gypsum Board1This standard is issued under the fixed designation C840; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i
2、n 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 U.S. Department of Defense.1. Scope*1.1 This specification covers the minimum requirements forth
3、e methods 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 t
4、esting 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 accor
5、dance withreports of acoustical tests of assemblies that have met therequired acoustical values.1.4 Unheated spaces above gypsum board ceilings shall beproperly ventilated (see Appendix X2).1.5 The various application systems are located in thefollowing sections:I Application of Single-ply Gypsum Bo
6、ard to WoodFramingMembers8II Application of Two-ply Gypsum Board to WoodFramingMembers9III 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 InteriorMasonr
7、y or Concrete Walls13VII Application of Gypsum Board to Rigid Foam Insulation 14VIII Application of Gypsum Board to Steel Framing andFurring15IX 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 21XV Application of Vinyl Faced Gypsum Board 221.6 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI u
9、nits that are provided for information onlyand are not considered standard.1.7 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
10、.1.8 The following precautionary caveat pertains only toSections 625. This standard does not purport to address allof the 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 app
11、lica-bility of regulatory limitations prior to use.1.8.1 For specific precautionary statements, see 4.1.1, 4.1.2,and 23.5.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC475/C475M Specification for Joint Compound and JointTape f
12、or Finishing Gypsum BoardC514 Specification for Nails for the Application of GypsumBoardC557 Specification for Adhesives for Fastening GypsumWallboard to Wood FramingC645 Specification for Nonstructural Steel Framing Mem-bers1This specification is under the jurisdiction of ASTM Committee C11 onGypsu
13、m 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 edition approved Sept. 1, 2016. Published September 2016. Originallyapproved in 1979. Last previous edition appro
14、ved in 2013 as C840 13. DOI:10.1520/C0840-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Ch
15、anges section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1C754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC920 Specification for Elast
16、omeric Joint SealantsC954 Specification for Steel Drill Screws for theApplicationof Gypsum Panel Products or Metal Plaster Bases to SteelStuds from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) inThicknessC1002 Specification for Steel Self-Piercing Tapping Screwsfor Application of Gypsum Panel Products
17、 or MetalPlaster Bases to Wood Studs or Steel StudsC1007 Specification for Installation of Load Bearing (Trans-verse and Axial) Steel Studs and Related AccessoriesC1047 Specification for Accessories for Gypsum Wallboardand Gypsum Veneer BaseC1396/C1396M Specification for Gypsum BoardC1546 Guide for
18、Installation of Gypsum Products in Con-cealed Radiant Ceiling Heating Systems2.2 U.S. Department of Commerce Publication:PS20 American Softwood Lumber Standard32.3 ANSI Standard:4ANSI A108 Specifications for the Installation of CeramicTileANSI A136.1 Specifications for Organic Adhesives forInstallat
19、ion of Ceramic Tile, Type I and Type II3. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 critical lighting, na condition where interior sur-faces are flooded by natural or artificial lighting at an obliqueangl
20、e.3.2.2 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).3.2.3 dry type, na compound in powder form to be mixedwith water before use.3.2.4 drying type,
21、na compound that hardens by theevaporation of the vehicle used to make the paste.3.2.5 drywall primer, na paint material specifically formu-lated to fill the pores and minimize the suction differencebetween gypsum board surface paper and the compound usedon finished joints, angles, fastener heads an
22、d accessories, andover skim coatings.3.2.6 face panel, noutside ply of multiple layer gypsumboard assemblies.3.2.7 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 t
23、he surface to receive job applied decoration.3.2.8 finishing, nthe preparation of gypsum board surfacesto receive the field application of decoration.3.2.9 finishing of accessories, nthe application of com-pound to flanges of accessories to create a monolithic surface.3.2.10 flange, nthat part of an
24、 accessory extending overthe face of the gypsum wallboard intended to become a part ofthe monolithic plane of the prepared surface.3.2.11 harden, va condition reached when the compoundhas lost its plasticity to an arbitrary degree, measured inresistance to penetration or deformation.3.2.12 joint pho
25、tographing, na condition where the fin-ished joint areas visible after final decoration.3.2.13 joint treatment, napplication of joint tape andcompound to the joint between gypsum boards.3.2.14 laminating compound, na compound (abrasive)used to adhere gypsum board to gypsum board or othermonolithic m
26、aterials.3.2.15 moderate contact, nthe edges and ends are buttedat joints but not forced together.3.2.15.1 DiscussionSmall gaps not greater than14 in.(6 mm) are acceptable (see 7.4).3.2.16 parallel or vertical application, ngypsum boardapplied with the edges parallel to the framing member to whichit
27、 is attached.3.2.17 perpendicular or horizontal application, ngypsumboard application with the edges applied at right angles to theframing member to which it is attached.3.2.18 ready-mix type, na factory-prepared compoundready to be used without the addition of water.3.2.19 required, adjpertaining t
28、o a mandatory obligationimposed by a force outside this standard, such as a buildingcode, project specification, contract, or purchase order.3.2.20 setting type, na compound that hardens by achemical reaction and increases in strength through drying.3.2.21 skim coat, na thin layer of skim coat compo
29、undapplied over the entire surface of finished gypsum board.3.2.21.1 DiscussionA skim coat is essentially a film ofjoint compound and is not applied at a readily measurablethickness. There is no specific mil thickness that constitutes aproper skim coat (see Appendix X7).3.2.22 skim coat compound, nj
30、oint compound, or a mate-rial specifically formulated and manufactured for use as a skimcoat.3.2.23 specified, adjpertaining to a mandatory require-ment of this standard or a referenced requirement (see 3.2.17).3.2.24 spotting fastener heads, nthe application of com-pound to cover the fastener head
31、to create a monolithic surface.3.2.25 taping of joints, nthe application of compound andjoint reinforcing tape to the joints between adjoining gypsumboards.3.2.26 treated joint, na joint between gypsum boards thathas been covered with joint tape and joint compound asspecified in 23.3.3.1, 23.3.3.2,o
32、r23.3.3.3.3Available from U.S. Government Printing Office, Washington, DC 20402.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.C840 1623.2.26.1 DiscussionStrip moldings or similar devicesshall be permitted.4. Environment
33、al Conditions4.1 Application of Gypsum Board, Joint TreatmentMaterials, and AdhesivesRoom temperature shall be main-tained at not less than 40F (4C) during application of gypsumboard except when adhesive is used for the attachment ofgypsum board. For the bonding of adhesive, joint treatment,texturin
34、g, and decoration, the room temperature shall bemaintained at not less than 50F (10C) for 48 h prior toapplication and continuously thereafter until completely dry.4.1.1 When a temporary heat source is used, the temperatureshall not exceed 95F (35C) in any given room or area.4.1.2 Adequate ventilati
35、on 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 manufacturers recommendations differ from theabove, follow their recommendations.4.3 Re
36、ady-mixed joint compounds shall be protected fromfreezing, exposure to extreme heat, and direct sunlight.5. Materials and Manufacture5.1 Gypsum BoardsA family of gypsum sheet products asdefined in Terminology C11.5.1.1 Type X (Special Fire-resistant) Gypsum Wallboard,Gypsum Backing Board, Water-resi
37、stant Gypsum BackingBoard, or Exterior Gypsum Sofft BoardGypsum board thatprovides a greater degree of fire resistance than regular gypsumboard as defined in Specification C1396/C1396M.5.1.2 Foil-backed Gypsum Wallboard or Gypsum BackingBoardRegular or Type X gypsum board with foil laminatedto the b
38、ack 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 WallboardSee Specification C1396/C1396M.5.3 Gypsum Backing Board and CoreboardSee Specifica-tion C1396/C1396M.5.
39、4 Water-resistant Gypsum Backing BoardSee Specifica-tion C1396/C1396M.5.5 Exterior Gypsum Sofft BoardSee SpecificationC1396/C1396M.5.6 Gypsum Ceiling BoardSee Specification C1396/C1396M.5.7 Finishing Materials:5.7.1 CompoundsTaping compound, finishing compound,and all-purpose compound shall meet the
40、 requirements ofSpecification C475/C475M.5.7.2 Mix compounds in accordance with the manufactur-ers directions.5.7.3 Joint TapeSee Specification C475/C475M.5.8 Fasteners:5.8.1 NailsSee Specification C514.5.8.1.1 Nails for use with pressure treated lumber shall becompatible with the preservative treat
41、ed and fire retardanttreated lumber.5.8.2 Screws:5.8.2.1 See Specification C1002 for screws for fasteninggypsum board to wood members, steel members less than0.033 in. (0.84 mm) in thickness, and to gypsum board.5.8.2.2 See Specifications C754 and C954 for screws forfastening gypsum board to steel m
42、embers from 0.033(0.84 mm) to 0.112 in. (2.84 mm) in thickness.5.8.2.3 Screws for use with pressure treated lumber shall becompatible with the preservative treated and fire retardanttreated lumber.5.8.3 StaplesNo. 16 USS gauge flattened galvanized wirestaples with716 in. (11 mm) wide crown outside m
43、easurement.Legs shall have divergent points.NOTE 2Use only for the base ply of two-ply gypsum board applica-tion.5.8.3.1 Staples for use with pressure treated lumber shall becompatible with the preservative treated and fire retardanttreated lumber.5.9 Adhesives:5.9.1 Fastening Gypsum Board to Wood F
44、ramingSeeSpecification C557.5.9.2 Fastening Gypsum Board to Steel FramingAs speci-fied by the manufacturer.5.9.3 Laminating Gypsum Board to Gypsum BoardLaminating compounds, taping compound, or adhesive shall beas specified by the manufacturer.5.10 Framing Members:5.10.1 Wood framing members shall c
45、onform to PS20,American Softwood Lumber Standards. The surface to whichabutting edges or ends are attached shall be not less than112 in. (38 mm) wide. For internal corners or angles, thebearing surface shall not be less than34 in. (19 mm).5.10.2 Steel Studs, Furring Channels, and Runners, Non-load-b
46、earing (see Specification C645).5.10.3 Gypsum StudsSpecification C1396/C1396M, notless than 1 in. (25 mm) thick by 6 in. (150 mm) wide. Studsshall be either solid or laminated.5.11 AccessoriesSee Specification C1047.5.12 WaterWater shall be clean, fresh, and potable (suit-able for domestic consumpti
47、on).5.13 Face PanelsFace panels shall be12 in. (12.7 mm),58 in. (15.9 mm), or multiple laminations of regular or Type Xgypsum board.5.14 Core BoardCore board shall be34 in. (19.0 mm) or1 in. (25.4 mm) either single thickness or multiple layers to therequired thickness.6. Substrate, Surface Preparati
48、on6.1 The attachment surface of any framing member shall notvary more than18 in. (3 mm) from the plane of the faces ofadjacent framing members.C840 1636.2 Wood framing shall be as straight and true as possible.Wood framing shall be securely attached following acceptableengineering practices and as r
49、equired for the intended design.NOTE 3For installation of wood framing, see Appendix X4.6.3 Metal framing members shall be of the proper size anddesign for their intended use and shall be installed in accor-dance with Specifications C754 or C1007 as required.6.4 Where used as an alternative to framing, backing, orblocking, specially designed corner clips and edge clips shallbe applied in accordance with their listings or approvals andthe clip manufacturers recommendations.6.5 Devices or items attached to f
