1、Designation: C 841 03Standard 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 last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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. Scope*1.1 This specification covers the minimum requirements for,
3、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 that their physical characteristics and durabilityunder conditions of usage are at least equal in perfo
4、rmance tothose described.1.2 The values stated in inch-pound units are to be regardedas the standard. The metric values shown in parentheses areprovided for information only.1.3 Details of construction for a specific assembly toachieve the required fire resistance shall be obtained fromreports of fi
5、re-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 constructionshall be obtained from reports of sound tests of assemblies thathave met the r
6、equirements of Test Method E 492.2. Referenced Documents2.1 ASTM Standards:A 641/A 641M Specification for Zinc-Coated (Galvanized)Carbon Steel Wire2C11 Terminology Relating to Gypsum and Related Build-ing Materials and Systems3C 37/C 37M Specification for Gypsum Lath3C 514 Specification for Nails fo
7、r the Application of Gyp-sum Board3C 754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel Products3C 842 Specification for Application of Interior GypsumPlaster3C 847 Specification for Metal Lath3C 933 Specification for Welded Wire Lath3C 954 Specificat
8、ion 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 0.112 in. (2.84mm) in Thickness3C 1002 Specification for Steel Self-Piercing TappingScrews for the Application of Gypsum Panel Products orMetal Plaster Bases to W
9、ood Studs or Steel Studs3C 1007 Specification for Installation of Load Bearing(Transverse and Axial) Steel Studs and Related Accesso-ries3C 1032 Specification for Woven Wire Plaster Base3D 1784 Specification for Rigid Poly(Vinyl Chloride) (PVC)Compounds and Chlorinated Poly(Vinyl Chloride)(CPVC) Com
10、pounds4D 3678 Specification for Rigid Poly(Vinyl Chloride) (PVC)Interior-Profile Extrusions5E 492 Method for Laboratory Measurement of ImpactSound Transmission Through Floor-Ceiling AssembliesUsing the Tapping Machine62.2 National Association of Architectural Metal Manufac-turers StandardHMMA 840 In
11、stallation and Storage of Hollow MetalDoors and Frames73. 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 scratch and brown coatsor the total coats in place prior to applic
12、ation 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 struct
13、uralmembers of the building.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 Application of Gypsum and OtherProducts in Assemblies.Current edition appro
14、ved June 10, 2003. Published August 2003. Originallyapproved in 1976. Last previous edition approved in 1999 as C 841 99.2Annual Book of ASTM Standards, Vol 01.06.3Annual Book of ASTM Standards, Vol 04.01.4Annual Book of ASTM Standards, Vol 08.01.5Annual Book of ASTM Standards, Vol 08.04.6Annual Boo
15、k of ASTM Standards, Vol 04.06.7Available from NAAMM, 8 South Michigan Avenue, Suite 1000, Chicago, IL60603.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2.4 suspe
16、nded 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 a
17、ttached 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 memb
18、ers (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 a
19、surface, 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 ma
20、terials 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 damag
21、e to edges, ends, or surfaces.6. Materials6.1 Wire Specification A 641/A 641M, 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)specifi
22、ed 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 (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.
23、 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 Gypsum LathSpecification C 37.6.3 Expanded Metal LathSpecification C 847.6.4 Wire Lath:6.4.1 Welded Wire Lath, Specification C 933.
24、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 Nails for Attaching Metal Plaster BaseGalvanizedroofing nails or common nails. length shall be as specified in 7.6.5.3 ScrewsSpecific
25、ations 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 Horizontal and Vertical Wood SupportsMaximum Spacing, in. (mm) Minimum Gage Requirements, in. (mm)Width ofLathThicknessof LathDist
26、anceBetweenSupportsNumber ofAttachmentsper BearingApproximateSpacing c to c ofAttachmentsLength ofLegDepth ofSupportPenetrationDiameter ofFlat Head orBlued Nailsor CrownWidth 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
27、)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 (610)12 (12.7) 24 (610) 6 412 (114) 114 (32)34 (19)1964 (7.5) 13 (330)118 (28.6)A
28、 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 supports shall be Type W as described in Specification C 1002.C8410326.5.3.2 Screw
29、s 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 enoughto allow for the threaded portion of the screw to project not lessthan38 in. (9.5 mm) through steel framing when the lath isinstalled
30、.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. (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
31、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 plasterbase shall allow for14 in. (6.4 mm) self furring. The backingshall permit embedment of plaster.6.7 AccessoriesShall be steel, coated, wi
32、th a protectiverust inhibitive coating after fabrication, or fabricated fromzinc-coated (galvanized) steel, aluminum, zinc alloy, or highimpact plastic. Plastic accessories shall be nmanufactured inaccordance with Specifcation D 1784 or Specification D 3678.Aluminum accessories shall be clear plasti
33、c coated. All acces-sories shall have perforated or expanded flanges or clips shapedso as to permit complete imbedment in the plaster, to providemeans for secure alignment, and to secure attachment of theaccessory to the underlying surface. Accessories shall bedesigned for the intended use and to re
34、ceive 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 following: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 Joints
35、Shall be formed by using a singleprefabricated member or fabricated by installing casing beadsback to back with a flexible barrier 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
36、 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 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 shap
37、ed 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 coating of rust inhibitive paint or galvanized. Channels usedin areas subject to corrosive action of salt air or other corrosiveenvironments, sh
38、all 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) 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 ru
39、st-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 lath, shall be formed ofzinc-coated (galvanized) steel wire or sheet, and of sufficientsize and strength to support the intended load6.7.7 S
40、triplathShall 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 than 1.75lb/yd2(0.85 kg/m2) fabricated from galvanized steel.7. Installation7.1 General Requirements for Application of Lath andAccessories
41、: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 all externalcorners and to establish grounds. Corner beads shall beattached to the substrate in such a manner as to ensure properalignment du
42、ring application of plaster.7.1.3 Metal accessories shall be installed so that flanges andclips provided for their attachment are 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 great
43、er 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 installed wherethe ceiling framing or furring changes direction. The distancebetween control joints in walls or wall furring shall be not moretha
44、n 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 accordance with thespacing requirements set forth in this section, is not prohibitedfrom being used as a control joint.7.1.5 Where partition
45、 assemblies require the installation ofcontrol joints over the head of door frames to relieve stresseswithin the assemblies, such 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 insta
46、lled 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 studs. A prefabricated control joint orcasing beads shall be installed at the joint location.7.1.5.2 Where control joints are located in lin
47、e 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.C8410337.1.6 Casing beads or other suitable accessories, shall beused to isolate non-load bearing partitions from load bearingmembers.7.1.7 Workmans
48、hipMetal 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 jamb
49、s 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. End joints shall fall ondifferent supports in alternate courses, or the lath shall beinstalled so that end joints are continuous on one support. Inthe latter ca
