1、Designation: C841 03 (Reapproved 2018)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 U.S. Department of Defense.1. Scope1.1 This specification covers the minimu
3、m requirements 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 le
4、ast equal 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
5、 assembly 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 constr
6、uctionshall be obtained from reports of sound tests of assemblies thathave met the requirements of Test Method E492.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment
7、 of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A641/A641M Specification for ZincCoated (Galvanized)Carbon Steel WireC11 Terminology Relating to Gypsum and Related Bu
8、ildingMaterials and SystemsC37/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
9、 Gypsum Plas-terC847 Specification 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 S
10、elf-Piercing 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 AccessoriesC1032 Specification for Woven Wire Plaster BaseD1784 Specification for
11、 Rigid Poly(Vinyl Chloride) (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
12、Machine2.2 National Association 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 C11.1This specification is under the jurisdiction of ASTM Committ
13、ee 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 edition approved Oct. 1, 2018. Published October 2018. Originallyapproved in 1976. Last previous ed
14、ition approved in 2013 as C841 03 (2013).DOI: 10.1520/C0841-03R18.2For 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 web
15、site.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Association of Architectural Metal Manufacturers(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
16、 of this standardCopyright ASTM International, 100 Barr Harbor Drive, 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 theDev
17、elopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.2 Definitions of Terms Specific to This Standard:3.2.1 base coat, nthe sum of the scratch and brown coatsor the total coats in place prior to applicat
18、ion of finish coats.3.2.2 contact ceiling, 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 structur
19、almembers of the building.3.2.4 suspended 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
20、 furring, nfurring members that are attached 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
21、lath.3.2.8 primary members, nthe members (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
22、transition, nthe change in width of asurface, 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) identificat
23、ion.5. Storage of Materials5.1 All materials 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 stack
24、ed flat with care taken toavoid damage to 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 strengt
25、h. Wire diameters (uncoated)specified herein correspond with United States steel wire gaugenumbers as follows:Diameter, in.A(Diameter, mm)Wire Gauge (U.S. SteelWire Gauge)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. 160.0800 (2.03) No. 140.0915 (2
26、.32) 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. 8AAllowable 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 L
27、ath: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 sh
28、all be as specified inSection 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. Th
29、e length shall 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 pl
30、aster base 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 m
31、etal plaster 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
32、 highimpact plastic. Plastic accessories shall be manufactured inaccordance with Specification D1784 or D3678. Aluminumaccessories shall be clear plastic coated. All accessories shallhave perforated or expanded flanges or clips shaped so as topermit complete imbedment in the plaster, to provide mean
33、s forsecure alignment, and to secure attachment of the accessory tothe underlying surface. Accessories shall be designed for theintended use and to receive or to permit application of thespecified plaster thickness.C841 03 (2018)26.7.1 Thickness of base material for accessories shall be notless than
34、 as shown in the following:Base Material (mm) Thickness of Base 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 barrier mem
35、brane behind casingbeads. The separation spacing shall be not less than18 in.(3.2 mm) or as required by the anticipated thermal exposurerange.6.7.3 Corneriteshall be not less than 1.75 lb/yd2(0.85 kg m2) expanded metal lath, galvanized, or given aprotective coating of rust inhibitive paint after fab
36、rication, orwoven or welded fabric not less than 0.041 in. (1.04 mm) thickan weighing 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.(50.8 mm).6.7.4 ChannelsShall be cold-rolled stee
37、l, 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 (kg/m)
38、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 framingmembers
39、; 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(0.85 kg m2) expanded metal lath, or woven or welded fabricof not less than 0.041 in. (1.04
40、mm) thick weighing not lessthan 1.75 lb 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 shal
41、l 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 cov
42、ered 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(15 m) in either direction. A c
43、ontrol joint shall be installedwhere the ceiling framing or furring changes direction. Thedistance between control joints in walls or wall furring shall benot more than 30 ft (9 m). A control joint shall be installedwhere an expansion joint occurs in the base exterior wall orceiling. A ceiling heigh
44、t door frame, installed in accordancewith the spacing requirements set forth in this section, is notprohibited from 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 con
45、trol 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 morethan12 in. (12.7 mm) apart over the center of the span at thehead of the frame, with the lath installed so that a vertic
46、al jointTABLE 1 Screws, Nails and StaplesA,Bfor Attaching Gypsum Lath to Horizontal and Vertical Wood SupportsMaximum Spacing, in. (mm) Minimum Gauge Requirements, in. (mm)Width of LathThickness ofLathDistanceBetweenSupportsNumber ofAttachmentsper BearingApproximateSpacing c to cof AttachmentsLength
47、 of LegDepth ofSupportPenetrationDiameter ofFlat Head orBlued Nails orCrown Widthof StaplesAGauge ofShank of Nailsor StaplesA16 (406)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)
48、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 (610)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) 2
49、4 (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 supports shall be Type W as described in Specification C1002.C841 03 (2018)3occurs between the studs. A prefabricated control joint orcasing beads shall be installed at the joint 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-
