1、Designation: C 841 03(Reapproved 2008)e1Standard Specification forInstallation of Interior Lathing and Furring1This standard is issued under the fixed designation C 841; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast 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.e1NOTEThe units statement in subsection 1.2 was co
3、rrected editorially in July 2008.1. Scope1.1 This specification covers the minimum requirements for,and the methods of application of, interior lathing and furringto receive gypsum plaster applied in accordance with Specifi-cation C 842. Other materials are not prohibited from beingused provided tha
4、t their physical characteristics and durabilityunder conditions of usage are at least 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 informat
5、ion onlyand are not considered standard.1.3 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 testing laboratories.1.4 Where a specific degree of soun
6、d control is required forplastered assemblies and constructions, details of constructionshall be obtained from reports of sound tests of assemblies thathave met the requirements of Test Method E 492.2. Referenced Documents2.1 ASTM Standards:2A 641/A 641M Specification for ZincCoated (Galvanized)Carb
7、on Steel WireC11 Terminology Relating to Gypsum and Related Build-ing Materials and SystemsC 37/C 37M Specification for Gypsum Lath3C 514 Specification for Nails for the Application of Gyp-sum BoardC 754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel
8、ProductsC 842 Specification for Application of Interior GypsumPlasterC 847 Specification for Metal LathC 933 Specification for Welded Wire LathC 954 Specification for Steel Drill Screws for the Applica-tion of Gypsum Panel Products or Metal Plaster Bases toSteel Studs from 0.033 in. (0.84 mm) to 0.1
9、12 in. (2.84mm) in ThicknessC 1002 Specification for Steel Self-Piercing TappingScrews for the Application of Gypsum Panel Products orMetal Plaster Bases to Wood Studs or Steel StudsC 1007 Specification for Installation of Load Bearing(Transverse and Axial) Steel Studs and Related Accesso-riesC 1032
10、 Specification for Woven Wire Plaster BaseD 1784 Specification for Rigid Poly(Vinyl Chloride) (PVC)Compounds and Chlorinated Poly(Vinyl Chloride)(CPVC) CompoundsD 3678 Specification for Rigid Poly(Vinyl Chloride) (PVC)Interior-Profile ExtrusionsE 492 Test Method for Laboratory Measurement of ImpactS
11、ound Transmission Through Floor-Ceiling AssembliesUsing the Tapping Machine2.2 National Association of Architectural Metal Manufac-turers StandardHMMA 840 Installation and Storage of Hollow MetalDoors and Frames43. Terminology3.1 DefinitionsFor definitions relating to ceilings andwalls see Terminolo
12、gy C11.3.2 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 application of finish coats.3.2.2 contact ceiling, na ceiling in which the lath isattached in direct contact with the construction above, withoutthe
13、use of main runners or cross furring.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 of Gypsum and OtherProducts in Assemblies.Current e
14、dition approved May 1, 2008. Published July 2008. Originally approvedin 1976. Last previous edition approved in 2003 as C 841 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
15、on, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Available from NAAMM, 8 South Michigan Avenue, Suite 1000, Chicago, IL60603.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2.3 furred ceiling, na ceil
16、ing in which the furring usedfor the support of the lath is attached directly to the structuralmembers 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 at
17、tached to orsuspended from the construction above for the support of crossfurring.3.2.6 cross 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, orpl
18、anar element that create an even surface for the application ofmetal plaster bases or gypsum 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 lat
19、h.3.2.10 face side (gypsum lath), nthe side opposite thepaper cover seam laps.3.2.11 surface 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 package
20、s,containers, or bundles bearing the brand name and manufac-turers (or suppliers) identification.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
21、,and protected from the weather and surface contamination.5.2 Materials shall be neatly stacked flat with care taken toavoid damage to edges, ends, or surfaces.6. Materials6.1 Wire SpecificationA 641/A 641M, Class 1 coating (gal-vanized) soft temper.6.1.1 Tie Wire and Hanger WireZinc-coated (galvani
22、zed)soft-annealed steel, or a material having equivalent size,corrosion resistance and strength. Wire diameters (uncoated)specified herein 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 (
23、1.21) No. 180.0540 (1.37) No. 170.0625 (1.59) No. 160.0800 (2.03) No. 140.0915 (2.32) 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. 8_AAllowable variations in diameter shall be in accordance with tolerances asestablished in A 641/A 641M.6.2 Gy
24、psum LathSpecification C 37.6.3 Expanded Metal LathSpecification C 847.6.4 Wire Lath:6.4.1 Welded Wire Lath, Specification C 933.6.4.2 Woven Wire Lath, Specification C 1032.6.5 Fasteners:6.5.1 Nails for Attaching Gypsum LathSpecificationC 514. Nail size shall be in accordance with Table 1.6.5.2 Nail
25、s for Attaching Metal Plaster BaseGalvanizedroofing nails or common nails. length shall be as specified in 7.6.5.3 ScrewsSpecifications C 954 or C 1002.6.5.3.1 Screws for attaching gypsum lath shall be sized inaccordance with Table 1.TABLE 1 Screws, Nails and StaplesA,Bfor Attaching Gypsum Lath to H
26、orizontal and Vertical Wood SupportsMaximum Spacing, in. (mm) Minimum Gage Requirements, in. (mm)Width ofLathThicknessof LathDistanceBetweenSupportsNumber ofAttachmentsper BearingApproximateSpacing c to c ofAttachmentsLength ofLegDepth ofSupportPenetrationDiameter ofFlat Head orBlued Nailsor CrownWi
27、dth ofStaplesAGage ofShank ofNails orStaplesA16 (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)A 58 (15.9)A 716 (11)A16A16 (406)12 (12.7) 24 (610) 4 5 (127) 114 (32)34 (19)196
28、4 (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) 24 (610) 1 (25.4)A 58 (15.9)A114 (32)34 (19)118 (28.6)A 58 (15.9)AAGalvanized sta
29、ples.BScrews for attaching gypsum lath to wood supports shall be Type W as described in Specification C 1002.C 841 03 (2008)e126.5.3.2 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 shall be sufficient
30、 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 shall be0.062 in.
31、 (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 plaster base. Metal pla
32、sterbase 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 highimpact plastic. Plastic
33、 accessories shall be nmanufactured inaccordance with Specifcation D 1784 or Specification D 3678.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 providemeans for secur
34、e 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 in the followin
35、g:Base 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 barrier membrane behind casingbeads.
36、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 after fabrication, or woven orwelde
37、d 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 steel, free of rust witha coat
38、ing 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)34 (19) 277 (0.412)112 (38
39、) 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; or for securing lath to
40、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. (1.04 mm) thick weighing not less
41、 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 shall be installed to protect a
42、ll 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 covered by the base coatplaste
43、r.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. A control joint shall be insta
44、lled 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 height door frame, installed in
45、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 control joints shall be instal
46、led 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 vertical jointoccurs between the
47、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-by-side.C 841 03
48、 (2008)e137.1.6 Casing beads or other suitable accessories, shall beused to isolate non-load bearing 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
49、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 thatvertical joints occur not less than one full stud space fromedges of openings in walls or partitions.7.2.2 Gypsum lath shall be installed with the face side outand the edges and ends butted together. En
