ASTM C840-2018b Standard Specification for Application and Finishing of Gypsum Board.pdf

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1、Designation: C840 18bStandard 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

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 U.S. Department of Defense.1. Scope*1.1 This specification covers the minimum requirements fort

3、he 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

4、testing 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 acco

5、rdance 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 B

6、oard to Wood Framing Members 8II Application of Two-ply Gypsum Board to Wood Framing Members 9III Application of Gypsum Board by Adhesive Nail-on to Wood FramingMembers10IV Semi-solid Gypsum Board Partitions 11V Solid Gypsum Board Partitions 12VI Application of Gypsum Board with Adhesives to Interio

7、r Masonry orConcrete 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 by Adhesive Application 17XI Exterior Application of Gypsum Wallboard and

8、 Exterior Gypsum SoffitBoard18XII 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 mathematicalconversi

9、ons to SI units 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 sp

10、ecification.1.8 The following precautionary caveat pertains only toSections 626. 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, health, and environmental prac

11、tices and deter-mine the applicability of regulatory limitations prior to use.Forspecific precautionary statements, see 4.1.1, 4.1.2, and 24.5.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Pr

12、inciples for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC475/C475M Spec

13、ification for Joint Compound and JointTape for 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-bersC754 Specification for Installa

14、tion of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC920 Specification for Elastomeric Joint Sealants1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.0

15、3 on Specifications for theApplication of Gypsum and OtherProducts in Assemblies.Current edition approved Nov. 15, 2018. Published November 2018. Originallyapproved in 1979. Last previous edition approved in 2018 as C840 18a. DOI:10.1520/C0840-18B.2For referenced ASTM standards, visit the ASTM websi

16、te, 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 Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Dr

17、ive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations i

18、ssued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1C954 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-P

19、iercing Tapping Screwsfor Application of Gypsum Panel Products 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 B

20、aseC1396/C1396M Specification for Gypsum BoardC1546 Guide for Installation of Gypsum Products in Con-cealed Radiant Ceiling Heating SystemsE2634 Specification for Flat Wall Insulating Concrete Form(ICF) Systems2.2 U.S. Department of Commerce Publication:PS20 American Softwood Lumber Standard32.3 ANS

21、I Standard:4ANSI A108 Specifications for the Installation of CeramicTileANSI A136.1 Specifications for Organic Adhesives forInstallation 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 St

22、andard:3.2.1 critical lighting, na condition where interior sur-faces are flooded by natural or artificial lighting at an obliqueangle.3.2.2 decoration, npaint (including primers), texture,coatings, and coverings such as wallpaper and sheet plasticmaterials designed to conceal or protect the surface

23、 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, 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

24、 minimize the suction differencebetween gypsum board surface paper and the compound usedon finished joints, angles, fastener heads and 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 thejoint

25、s taped, has had the joints, fastener heads, and flanges ofaccessories concealed with joint compound, and has beensanded to prepare the 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 o

26、f accessories, nthe application of com-pound to flanges of accessories to create a monolithic surface.3.2.10 flange, nthat part of an 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

27、when the compoundhas lost its plasticity to an arbitrary degree, measured inresistance to penetration or deformation.3.2.12 joint photographing, 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 bet

28、ween gypsum boards.3.2.14 laminating compound, na compound (abrasive)used to adhere gypsum board to gypsum board or othermonolithic materials.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 accept

29、able (see 7.4).3.2.16 parallel or vertical application, ngypsum boardapplied with the edges parallel to the framing member to whichit 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 attach

30、ed.3.2.18 ready-mix type, na factory-prepared compoundready to be used without the addition of water.3.2.19 required, adjpertaining to 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 co

31、mpound that hardens by achemical reaction and increases in strength through drying.3.2.21 skim coat, na thin layer of skim coat compoundapplied 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 measu

32、rablethickness. There is no specific mil thickness that constitutes aproper skim coat (see Appendix X7).3.2.22 skim coat compound, njoint 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 standa

33、rd or a referenced requirement (see 3.2.17).3.2.24 spotting fastener heads, nthe application of com-pound to cover the fastener head 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 trea

34、ted joint, na joint between gypsum boards thathas been covered with joint tape and joint compound asspecified in 24.3.3.1, 24.3.3.2,or24.3.3.3.3.2.26.1 DiscussionStrip moldings or similar devicesshall be permitted.3Available from U.S. Government Printing Office, Washington, DC 20402.4Available from

35、American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.C840 18b24. Environmental Conditions4.1 Application of Gypsum Board, Joint TreatmentMaterials, and AdhesivesRoom temperature shall be main-tained at not less than 40F (4C) during applicatio

36、n of gypsumboard except when adhesive is used for the attachment ofgypsum board. For the bonding of adhesive, joint treatment,texturing, and decoration, the room temperature shall bemaintained at not less than 50F (10C) for 48 h prior toapplication and continuously thereafter until completely dry.Se

37、e X7.7 for additional detail regarding environmental controlduring the installation and finishing process.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 ventilation shall be maintained in the work-ing area during install

38、ation 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 Ready-mixed joint compounds shall be protected fromfreezing,

39、 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-resistant Gypsum BackingBoard, or Exterior Gypsum Sofft BoardG

40、ypsum 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 back surface. The foil is a vapor retarder.5.1.3 Predecorat

41、ed 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.5.4 Water-resistant Gypsum Backing BoardSee Specifica-tion C

42、1396/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 requirements ofSpecification C475/C475M.5.7.2 Mix compoun

43、ds 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 treated and fire retardanttreated lumber.5.8.2 Screws:5.8.2.1 S

44、ee 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 members from 0.033 to0.112 in. (0.84 to 2.84 mm) in thickne

45、ss.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 measurement.Legs shall have divergent points.NOTE 2Use only f

46、or 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 FramingSeeSpecification C557.5.9.2 Fastening Gypsum Board to

47、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 conform to PS20,American Softwood Lumber Standards. The surfa

48、ce to whichabutting edges or ends are attached shall be not less than 112 in.(38 mm) wide. For internal corners or angles, the bearingsurface shall not be less than34 in. (19 mm).5.10.2 Steel Studs, Furring Channels, and Runners, Non-load-bearing (see Specification C645).5.10.3 Gypsum StudsSpecifica

49、tion 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 consumption).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 or 1 in. (19 or25.4 mm) either single thickness or multiple layers to therequired 25 mm thickness.6. Substr