1、Designation: C841 03 (Reapproved 2013)Standard Specification forInstallation of Interior Lathing and Furring1This standard is issued under the fixed designation C841; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A 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 Department of Defense.1. Scope1.1 This specification covers the minimum req
3、uirements for,and the methods of application of, interior lathing and furringto receive gypsum plaster applied in accordance with Specifi-cation C842. Other materials are not prohibited from beingused provided that their physical characteristics and durabilityunder conditions of usage are at least e
4、qual in performance tothose described.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 Details of construction for a specific asse
5、mbly toachieve the required fire resistance shall be obtained fromreports of fire-resistance tests, engineering evaluations, orlistings from recognized fire testing laboratories.1.4 Where a specific degree of sound control is required forplastered assemblies and constructions, details of constructio
6、nshall be obtained from reports of sound tests of assemblies thathave met the requirements of Test Method E492.2. Referenced Documents2.1 ASTM Standards:2A641/A641M Specification for ZincCoated (Galvanized)Carbon Steel WireC11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC
7、37/C37M Specification for Gypsum Lath (Withdrawn2004)3C514 Specification for Nails for the Application of GypsumBoardC754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC842 Specification for Application of Interior Gypsum Plas-terC847 Specifi
8、cation for Metal LathC933 Specification for Welded Wire LathC954 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 Screwsf
9、or the 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 AccessoriesC1032 Specification for Woven Wire Plaster BaseD1784 Specification for Rigid Poly(Vinyl Chlori
10、de) (PVC)Compounds and Chlorinated Poly(Vinyl Chloride)(CPVC) CompoundsD3678 Specification for Rigid Poly(Vinyl Chloride) (PVC)Interior-Profile ExtrusionsE492 Test Method for Laboratory Measurement of ImpactSound Transmission Through Floor-Ceiling AssembliesUsing the Tapping Machine2.2 National Asso
11、ciation of Architectural Metal Manufac-turers StandardHMMA 840 Installation and Storage of Hollow Metal Doorsand Frames43. Terminology3.1 DefinitionsFor definitions relating to ceilings andwalls see Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 base coat, nthe sum of the s
12、cratch and brown coatsor the total coats in place prior to application of finish coats.1This 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 o
13、f Gypsum and OtherProducts in Assemblies.Current edition approved Oct. 1, 2013. Published October 2013. Originallyapproved in 1976. Last previous edition approved in 2008 as C841 03 (2008)1.DOI: 10.1520/C0841-03R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
14、Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Association of Architectural Metal Ma
15、nufacturers(NAAMM), 800 Roosevelt Road, Bldg. C, Suite 312, Glen Ellyn, IL 60137,http:/www.naamm.org.*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 States13.2.2 contact ceilin
16、g, na ceiling in which the lath isattached in direct contact with the construction above, withoutthe use of main runners or cross furring.3.2.3 furred ceiling, na ceiling in which the furring usedfor the support of the lath is attached directly to the structuralmembers of the building.3.2.4 suspende
17、d ceiling, na ceiling in which the mainrunners and cross furring are suspended below the structuralmembers of the building.3.2.5 main runners, nthe members that are attached to orsuspended from the construction above for the support of crossfurring.3.2.6 cross furring, nfurring members that are atta
18、ched atright angles to the underside of the main runners or construc-tion above for support of the lath.3.2.7 furring, nspacer strips fastened to a wall, ceiling, orplanar element that create an even surface for the application ofmetal plaster bases or gypsum lath.3.2.8 primary members, nthe members
19、 (main runners orstructural supports) to which the cross furring is attached.3.2.9 metal plaster bases, nexpanded metal lath, sheetmetal lath, welded or woven wire lath.3.2.10 face side (gypsum lath), nthe side opposite thepaper cover seam laps.3.2.11 surface transition, nthe change in width of asur
20、face, usually as a result of penetrations (doors, windows) orarchitectural demands.4. Delivery of Materials4.1 All materials shall be delivered in the original packages,containers, or bundles bearing the brand name and manufac-turers (or suppliers) identification.5. Storage of Materials5.1 All mater
21、ials shall be kept dry, preferably by beingstored inside. Where necessary to be stored outside, materialsshall be stacked off the ground, supported on a level platform,and protected from the weather and surface contamination.5.2 Materials shall be neatly stacked flat with care taken toavoid damage t
22、o edges, ends, or surfaces.6. Materials6.1 Wire Specification A641/A641M, Class 1 coating (gal-vanized) soft temper.6.1.1 Tie Wire and Hanger WireZinc-coated (galvanized)soft-annealed steel, or a material having equivalent size,corrosion resistance and strength. Wire diameters (uncoated)specified he
23、rein correspond with United States steel wire gagenumbers as follows:Diameter, in.A(mm)Wire Gage (U.S. SteelWire Gage)0.0348 (0.88) No. 200.0410 (1.04) No. 190.0475 (1.21) No. 180.0540 (1.37) No. 170.0625 (1.59) No. 16Diameter, in.A(mm)Wire Gage (U.S. SteelWire Gage)0.0800 (2.03) No. 140.0915 (2.32)
24、 No. 130.1055 (2.68) No. 120.1205 (3.06) No. 110.1350 (3.43) No. 100.1483 (3.77) No. 90.1620 (4.11) No. 8_AAllowable variations in diameter shall be in accordance with tolerances asestablished in A641/A641M.6.2 Gypsum LathSpecification C37/C37M.6.3 Expanded Metal LathSpecification C847.6.4 Wire Lath
25、:6.4.1 Welded Wire Lath, Specification C933.6.4.2 Woven Wire Lath, Specification C1032.6.5 Fasteners:6.5.1 Nails for Attaching Gypsum LathSpecificationC514. Nail size shall be in accordance with Table 1.6.5.2 Nails for Attaching Metal Plaster BaseGalvanizedroofing nails or common nails. length shall
26、 be as specified in 7.6.5.3 ScrewsSpecifications C954 or C1002.6.5.3.1 Screws for attaching gypsum lath shall be sized inaccordance with Table 1.6.5.3.2 Screws for attaching metal plaster base shall have a716 in. (11.1 mm) diameter pan washer head and a 0.120 in.(3.0 mm) diameter shank. The length s
27、hall be sufficient enoughto allow for the threaded portion of the screw to project not lessthan38 in. (9.5 mm) through steel framing when the lath isinstalled.6.5.4 StaplesStaples for attaching gypsum lath shall con-form to the requirements of Table 1.6.5.4.1 Staples for attaching metal plaster base
28、 shall be0.062 in. (1.6 mm) diameter, round or flattened steel wire with34 in. (19.0 mm) crown. Lengths shall be as specified forindividual systems.6.6 Paper or Other BackingWhen used on metal plasterbases, over solid backing, backing shall be securely held inplace by, or attached to the metal plast
29、er base. Metal plasterbase shall allow for14 in. (6.4 mm) self furring. The backingshall permit embedment of plaster.6.7 AccessoriesShall be steel, coated, with a protectiverust inhibitive coating after fabrication, or fabricated fromzinc-coated (galvanized) steel, aluminum, zinc alloy, or highimpac
30、t plastic. Plastic accessories shall be nmanufactured inaccordance with Specifcation D1784 or Specification D3678.Aluminum accessories shall be clear plastic coated. All acces-sories shall have perforated or expanded flanges or clips shapedso as to permit complete imbedment in the plaster, to provid
31、emeans for secure alignment, and to secure attachment of theaccessory to the underlying surface. Accessories shall bedesigned for the intended use and to receive or to permitapplication of the specified plaster thickness.6.7.1 Thickness of base material for accessories shall be notless than as shown
32、 in the following:C841 03 (2013)2Base Material (mm) Thickness ofBase Material, in.Uncoated steel/zinc 0.014 (0.36)PVC 0.030 (0.76)Aluminum 0.050 (1.27)6.7.2 Control JointsShall be formed by using a singleprefabricated member or fabricated by installing casing beadsback to back with a flexible barrie
33、r membrane behind casingbeads. The separation spacing shall be not less than18 in. (3.2mm) or as required by the anticipated thermal exposure range.6.7.3 Corneriteshall be not less than 1.75 lb/yd2(0.85kg/m2) expanded metal lath, galvanized, or given a protectivecoating of rust inhibitive paint afte
34、r fabrication, or woven orwelded fabric not less than 0.041 in. (1.04 mm) thick anweighing not less than 1.75 lb/yd2(0.85 kg/m2), fabricatedfrom galvanized wire. When shaped for angle reinforcing,cornerite shall have outstanding legs of not less than 2 in. (50.8mm).6.7.4 ChannelsShall be cold-rolled
35、 steel, free of rust witha coating of rust inhibitive paint or galvanized. Channels usedin areas subject to corrosive action of salt air or other corrosiveenvironments, shall be hot-dip galvanized. Weight of thechannel shall be not less than as shown in the following:Size Weightin. (mm) lb/1000 lf (
36、kg/m)34 (19) 277 (0.412)112 (38) 414 (0.616)2 (50) 506 (0.753)212 (64) 597 (0.888)6.7.5 Rod and flat (strap) hangers shall be mild steel, zinccoated or protected with a rust-inhibiting paint.6.7.6 ClipsDevices for attaching framing members tosupports or to each other; for attaching lath to framingme
37、mbers; or for securing lath to lath, shall be formed ofzinc-coated (galvanized) steel wire or sheet, and of sufficientsize and strength to support the intended load6.7.7 StriplathShall be not less than 1.75 lb/yd2(0.85kg/m2) expanded metal lath, or woven or welded fabric of notless than 0.041 in. (1
38、.04 mm) thick weighing not less than 1.75lb/yd2(0.85 kg/m2) fabricated from galvanized steel.7. Installation7.1 General Requirements for Application of Lath andAccessories:7.1.1 Lath shall be installed with the long dimension at rightangles to supports, unless otherwise specified.7.1.2 Corner beads
39、shall be installed to protect all externalcorners and to establish grounds. Corner beads shall beattached to the substrate in such a manner as to ensure properalignment during application of plaster.7.1.3 Metal accessories shall be installed so that flanges andclips provided for their attachment are
40、 covered by the base coatplaster.7.1.4 Control JointsShall be installed in ceilings greaterthan 2500 ft2(232 m2) in area and in partition, wall, and wallfurring runs greater than 30 ft (9 m) in length. The distancebetween ceiling control joints shall not be more than 50 ft (15m) in either direction.
41、 A control joint shall be installed wherethe ceiling framing or furring changes direction. The distancebetween control joints in walls or wall furring shall be not morethan 30 ft (9 m). A control joint shall be installed where anexpansion joint occurs in the base exterior wall or ceiling. Aceiling h
42、eight door frame, installed in accordance with thespacing requirements set forth in this section, is not prohibitedfrom being used as a control joint.7.1.5 Where partition assemblies require the installation ofcontrol joints over the head of door frames to relieve stresseswithin the assemblies, such
43、 control joints shall be installed inthe following manner:7.1.5.1 Where control joints are located at the vertical centerof the door opening two metal studs shall be installed not moreTABLE 1 Screws, Nails and StaplesA,Bfor Attaching Gypsum Lath to Horizontal and Vertical Wood SupportsMaximum Spacin
44、g, in. (mm) Minimum Gage Requirements, in. (mm)Width ofLathThicknessof LathDistanceBetweenSupportsNumber ofAttachmentsper BearingApproximateSpacing c to c ofAttachmentsLength ofLegDepth ofSupportPenetrationDiameter ofFlat Head orBlued Nailsor CrownWidth ofStaplesAGage ofShank ofNails orStaplesA16 (4
45、06)38 (9.5) 16 (406) 4 5 (127) 118 (28.6)34 (19)1964 (7.5) 131 (25.4)A 58 (15.9)A 716 (11)A16A24 (610)38 (9.5) 16 (406) 6 412 (114) 118 (28.6)34 (19)1964 (7.5) 131 (25.4)A 58 (15.9)A 716 (11)A16A16 (406)12 (12.7) 24 (610) 4 5 (127) 114 (32)34 (19)1964 (7.5) 13118 (28.6)A 58 (15.9)A 716 (11)A16A24 (6
46、10)12 (12.7) 24 (610) 6 412 (114) 114 (32)34 (19)1964 (7.5) 13 (330)118 (28.6)A 58 (15.9)A 716 (11)A16A48 (1219)38 (9.5) 16 (406) 8 412 (114) 118 (28.6)34 (19)12 (12.7) 24 (610) 1 (25.4)A 58 (15.9)A114 (32)34 (19)118 (28.6)A 58 (15.9)AAGalvanized staples.BScrews for attaching gypsum lath to wood sup
47、ports shall be Type W as described in Specification C1002.C841 03 (2013)3than12 in. (12.7 mm) apart over the center of the span at thehead of the frame, with the lath installed so that a vertical jointoccurs between the studs. A prefabricated control joint orcasing beads shall be installed at the jo
48、int location.7.1.5.2 Where control joints are located in line with the doorjambs the procedure in 7.1.5.1 shall be followed with theexception that supporting members shall consist of two studsplaced side-by-side.7.1.6 Casing beads or other suitable accessories, shall beused to isolate non-load beari
49、ng partitions from load bearingmembers.7.1.7 WorkmanshipMetal construction furring and lathingshall be erected so that finished plaster surfaces will be true toline, level, plumb, square, curved, or as required to receivespecified plaster thickness.7.1.8 Except where frames are required to be fully groutedwith plaster, lath shall be inserted into jambs as far as possibleand notched to pass anchors.7.2 Application of Gypsum Lath to Supports:7.2.1 GeneralGypsum lath shall be installed so tha
