1、Designation: C840 17C840 17aStandard 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
2、number 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 U.S. Department of Defense.1. Scope*1.1 This specification covers the minimum requiremen
3、ts for the methods of application and finishing of gypsum board,including related items and accessories.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 recogn
4、ized fire testing laboratories.1.2.1 Where this specification is more stringent (size or thickness of framing: size and spacing of fasteners) than the fire-ratedconstruction, this specification shall govern.1.3 Where sound control is required for a gypsum board assembly, details of construction shal
5、l be in accordance with reportsof acoustical tests of assemblies that have met the required acoustical values.1.4 Unheated spaces above gypsum board ceilings shall be properly ventilated (see Appendix X2).1.5 The various application systems are located in the following sections:I Application of Sing
6、le-ply Gypsum Board 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 t
7、o InteriorMasonry 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 Wallboar
8、d andExterior Gypsum 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 regarded as standard. The values given in parentheses are mathematicalco
9、nversions to SI units that are provided for information only and are not considered standard.1.7 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements
10、of the specification.1 This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility ofSubcommittee C11.03 on Specifications for the Application of Gypsum and Other Products in Assemblies.Current edition appro
11、ved April 1, 2017Oct. 1, 2017. Published April 2017October 2017. Originally approved in 1979. Last previous edition approved in 20132017 asC840 16.C840 17. DOI: 10.1520/C0840-17.10.1520/C0840-17A.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an in
12、dication of what changes have been made to the previous version. Becauseit may not be technically 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
13、 considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.8 The following precautionary caveat pertains only to Sections 6 25. This standard do
14、es not purport to address all of thesafety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safetyand health practices and determine the applicability of regulatory limitations prior to use.1.8.1 For specific precautionary stat
15、ements, see 4.1.1, 4.1.2, and 23.5.1.8 The following precautionary caveat pertains only to Sections 6 26. This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety,health
16、, and environmental practices and determine the applicability of regulatory limitations prior to use.For specificprecautionary statements, see 4.1.1, 4.1.2, and 24.5.1.9 This international standard was developed in accordance with internationally recognized principles on standardizationestablished i
17、n the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Building Materials and S
18、ystemsC475/C475M Specification for Joint Compound and Joint Tape for Finishing Gypsum BoardC514 Specification for Nails for the Application of Gypsum BoardC557 Specification for Adhesives for Fastening Gypsum Wallboard to Wood FramingC645 Specification for Nonstructural Steel Framing MembersC754 Spe
19、cification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel ProductsC920 Specification for Elastomeric Joint SealantsC954 Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studsfrom 0.033 in. (0.84 mm) to
20、 0.112 in. (2.84 mm) in ThicknessC1002 Specification for Steel Self-Piercing Tapping Screws for Application of Gypsum Panel Products or Metal Plaster Basesto Wood Studs or Steel StudsC1007 Specification for Installation of Load Bearing (Transverse and Axial) Steel Studs and Related AccessoriesC1047
21、Specification for Accessories for Gypsum Wallboard and Gypsum Veneer BaseC1396/C1396M Specification for Gypsum BoardC1546 Guide for Installation of Gypsum Products in Concealed Radiant Ceiling Heating SystemsE2634 Specification for Flat Wall Insulating Concrete Form (ICF) Systems2.2 U.S. Department
22、of Commerce Publication:PS20 American Softwood Lumber Standard32.3 ANSI Standard:4ANSI A108 Specifications for the Installation of Ceramic TileANSI A136.1 Specifications for Organic Adhesives for Installation of Ceramic Tile, Type I and Type II3. Terminology3.1 DefinitionsDefinitions shall be in acc
23、ordance with Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 critical lighting, na condition where interior surfaces are flooded by natural or artificial lighting at an oblique angle.3.2.2 decoration, npaint (including primers), texture, coatings, and coverings such as wallp
24、aper and sheet plastic materialsdesigned to conceal or protect the surface of the gypsum board (see Appendix X3).3.2.3 dry type, na compound in powder form to be mixed with water before use.3.2.4 drying type, na compound that hardens by the evaporation of the vehicle used to make the paste.3.2.5 dry
25、wall primer, na paint material specifically formulated to fill the pores and minimize the suction difference betweengypsum board surface paper and the compound used on finished joints, angles, fastener heads and accessories, and over skimcoatings.3.2.6 face panel, noutside ply of multiple layer gyps
26、um board assemblies.3.2.7 finished wallboard, nwallboard that has had the joints taped, has had the joints, fastener heads, and flanges of accessoriesconcealed with joint compound, and has been sanded to prepare the surface to receive job applied decoration.3.2.8 finishing, nthe preparation of gypsu
27、m board surfaces to receive the field application of decoration.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM websi
28、te.3 Available from U.S. Government Printing Office, Washington, DC 20402.4 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.C840 17a23.2.9 finishing of accessories, nthe application of compound to flanges of accessories t
29、o create a monolithic surface.3.2.10 flange, nthat part of an accessory extending over the face of the gypsum wallboard intended to become a part of themonolithic plane of the prepared surface.3.2.11 harden, va condition reached when the compound has lost its plasticity to an arbitrary degree, measu
30、red in resistanceto penetration or deformation.3.2.12 joint photographing, na condition where the finished joint areas visible after final decoration.3.2.13 joint treatment, napplication of joint tape and compound to the joint between gypsum boards.3.2.14 laminating compound, na compound (abrasive)
31、used to adhere gypsum board to gypsum board or other monolithicmaterials.3.2.15 moderate contact, nthe edges and ends are butted at joints but not forced together.3.2.15.1 DiscussionSmall gaps not greater than 14 in. (6 mm) are acceptable (see 7.4).3.2.16 parallel or vertical application, ngypsum bo
32、ard applied with the edges parallel to the framing member to which it isattached.3.2.17 perpendicular or horizontal application, ngypsum board 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 compound ready to
33、be used without the addition of water.3.2.19 required, adjpertaining to a mandatory obligation imposed by a force outside this standard, such as a building code,project specification, contract, or purchase order.3.2.20 setting type, na compound that hardens by a chemical reaction and increases in st
34、rength through drying.3.2.21 skim coat, na thin layer of skim coat compound applied over the entire surface of finished gypsum board.3.2.21.1 DiscussionA skim coat is essentially a film of joint compound and is not applied at a readily measurable thickness. There is no specific milthickness that con
35、stitutes a proper skim coat (see Appendix X7).3.2.22 skim coat compound, njoint compound, or a material specifically formulated and manufactured for use as a skim coat.3.2.23 specified, adjpertaining to a mandatory requirement of this standard or a referenced requirement (see 3.2.17).3.2.24 spotting
36、 fastener heads, nthe application of compound to cover the fastener head to create a monolithic surface.3.2.25 taping of joints, nthe application of compound and joint reinforcing tape to the joints between adjoining gypsumboards.3.2.26 treated joint, na joint between gypsum boards that has been cov
37、ered with joint tape and joint compound as specifiedin 23.3.3.124.3.3.1, 23.3.3.224.3.3.2, or 23.3.3.324.3.3.3.3.2.26.1 DiscussionStrip moldings or similar devices shall be permitted.4. Environmental Conditions4.1 Application of Gypsum Board, Joint Treatment Materials, and AdhesivesRoom temperature
38、shall be maintained at not lessthan 40F (4C) during application of gypsum board except when adhesive is used for the attachment of gypsum board. For thebonding of adhesive, joint treatment, texturing, and decoration, the room temperature shall be maintained at not less than 50F(10C) for 48 h prior t
39、o application and continuously thereafter until completely dry. See X7.7 for additional detail regardingenvironmental control during the installation and finishing process.4.1.1 When a temporary heat source is used, the temperature shall not exceed 95F (35C) in any given room or area.4.1.2 Adequate
40、ventilation shall be maintained in the working area during installation and curing period.4.2 Gypsum board shall be protected from direct exposure to rain, snow, sunlight, or other excessive weather conditions.NOTE 1Where manufacturers recommendations differ from the above, follow their recommendati
41、ons.4.3 Ready-mixed joint compounds shall be protected from freezing, exposure to extreme heat, and direct sunlight.5. Materials and Manufacture5.1 Gypsum BoardsA family of gypsum sheet products as defined in Terminology C11.C840 17a35.1.1 Type X (Special Fire-resistant) Gypsum Wallboard, Gypsum Bac
42、king Board, Water-resistant Gypsum Backing Board, orExterior Gypsum Sofft BoardGypsum board that provides a greater degree of fire resistance than regular gypsum board asdefined in Specification C1396/C1396M.5.1.2 Foil-backed Gypsum Wallboard or Gypsum Backing BoardRegular or Type X gypsum board wit
43、h foil laminated to theback surface. The foil is a vapor retarder.5.1.3 Predecorated Gypsum BoardGypsum board with a decorative wall covering or coating applied in-plant by the gypsumboard manufacturer.5.2 Gypsum WallboardSee Specification C1396/C1396M.5.3 Gypsum Backing Board and CoreboardSee Speci
44、fication C1396/C1396M.5.4 Water-resistant Gypsum Backing BoardSee Specification C1396/C1396M.5.5 Exterior Gypsum Sofft BoardSee Specification C1396/C1396M.5.6 Gypsum Ceiling BoardSee Specification C1396/C1396M.5.7 Finishing Materials:5.7.1 CompoundsTaping compound, finishing compound, and all-purpos
45、e compound shall meet the requirements ofSpecification C475/C475M.5.7.2 Mix compounds in accordance with the manufacturers 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 be compatible wi
46、th the preservative treated and fire retardant treatedlumber.5.8.2 Screws:5.8.2.1 See Specification C1002 for screws for fastening gypsum board to wood members, steel members less than 0.033 in.(0.84 mm) in thickness, and to gypsum board.5.8.2.2 See Specifications C754 and C954 for screws for fasten
47、ing gypsum board to steel members from 0.033 to 0.112 in.(0.84 to 2.84 mm) in thickness.5.8.2.3 Screws for use with pressure treated lumber shall be compatible with the preservative treated and fire retardant treatedlumber.5.8.3 StaplesNo. 16 USS gauge flattened galvanized wire staples with 716 in.
48、(11 mm) wide crown outside measurement. Legsshall have divergent points.NOTE 2Use only for the base ply of two-ply gypsum board application.5.8.3.1 Staples for use with pressure treated lumber shall be compatible with the preservative treated and fire retardant treatedlumber.5.9 Adhesives:5.9.1 Fast
49、ening Gypsum Board to Wood FramingSee Specification C557.5.9.2 Fastening Gypsum Board to Steel FramingAs specified by the manufacturer.5.9.3 Laminating Gypsum Board to Gypsum BoardLaminating compounds, taping compound, or adhesive shall be asspecified by the manufacturer.5.10 Framing Members:5.10.1 Wood framing members shall conform to PS20, American Softwood Lumber Standards. The surface to which abuttingedges or ends are attached shall be not less than 1 12 in. (38 mm) wide. For internal corners or angles, th
