1、Designation: C847 14Standard Specification forMetal Lath1This standard is issued under the fixed designation C847; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the yea
2、r 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 sheet lath, expanded metallath, diamond mesh, flat and self-f
3、urring, and rib metal lath,18and38 in. (3.2 and 9.6 mm), all with or without backing anddesigned to be used as a base for gypsum or portland cementplaster.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units
4、that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2A653/A653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip Process3. Material3.1 Metal lath shall be fabricated from cold-rol
5、led carbonsteel sheet of commercial quality conforming to SpecificationA653/A653M. Galvanized metal lath shall have a G60 coatingin accordance with Specification A653/A653M.3.2 Backing shall be attached to the lath sufficiently enoughto prevent accidental removal during shipping, handling, orinstall
6、ation. Attachment of backing shall also allow lapping ofmetal to metal and backing to backing, 1 in. (25.4 mm) on theends and12 in. (12.7 mm) on the sides.4. Dimensions, Mass, and Permissible Variations4.1 ThicknessThe nominal thickness of diamond meshand flat rib metal lath shall be18 in. (3.2 mm).
7、 The nominalthickness of other rib metal lath shall be as designated,38 in.(9.6 mm). The nominal thickness of self-furring diamond meshshall be516 in. (7.9 mm).4.2 WidthThe minimum width of metal lath shall be 27 in.(686 mm).4.3 LengthThe minimum length of metal lath shall be 97in. (2464 mm).4.4 Wei
8、ghtThe weight of metal lath shall be as follows:4.4.1 U.S. Weights:Type: Weight, lb/yd2(kg/m2)Diamond mesh 2.5 (1.4); 3.4 (1.8)Flat rib 1.8 (1.0); 2.75 (1.5); 3.4 (1.8)38-in. rib 3.4 (1.8); 4.0 (2.1)4.4.2 Canadian Weights:Type: Weight, lb/yd2(kg/m2)Diamond mesh 2.5 (1.4); 3.0 (1.6); 3.4 (1.8)Flat ri
9、b 1.8 (1.0); 2.5 (1.4); 3.0 (1.6)38-in. rib 3.0 (1.6); 3.5 (1.9); 4.0 (2.1)4.5 Permissible VariationsThe permissible variationsshall be as follows:4.5.1 Thickness, 6164 in. (0.4 mm).4.5.2 Width, 638 in. (9.5 mm).4.5.3 Length, 0 in., + 112 in. (38.1 mm).4.5.4 Weight, 6 10 %.5. Finish5.1 Metal lath sh
10、all be fabricated from hot-dipped galva-nized steel.6. Weight Test6.1 Significance and UseThis test method provides aprocedure for measuring the weight of a single sheet of metallath. It shall be used to determine compliance with thisspecification. The degree of performance of this test methodwith s
11、ervice performance has not been determined.6.2 Apparatus:6.2.1 Scale, capable of weighing in increments of 0.1 lb(0.05 kg) or 1 oz (28 g).6.2.2 Tape Measure, capable of measuring in increments of116 in. (1.6 mm).1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related
12、 Building Materials and Systems and is the direct responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved June 1, 2014. Published July 2014. Originally approvedin 1977. Last previous edition approved in 2012 as C84712. DOI:
13、 10.1520/C0847-14.2For 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 website.*A Summary of Changes section appears at th
14、e end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.3 Materials shall satisfy the following:6.3.1 Metal LathSpecification C847.6.4 SamplingOne sheet shall be selected from each bundleor package, but not more than f
15、ive sheets from any oneshipment for testing.6.5 Specimen Preparation:6.5.1 Measure and record the width and length of eachspecimen.NOTE 1For paper-backed lath, remove the paper and glue from thelath before weighing the specimen.6.5.2 Each specimen to be weighed shall be permitted to befolded.6.6 Pro
16、cedure:6.6.1 Attach the scale to a suitable support and tare the scaleto zero.6.6.2 Attach the specimen to the scale.6.6.3 Record the weight of the specimen.6.6.4 Calculate the number of square yards of materialpresent in each specimen.NOTE 2The number of square yards per specimen is determined byta
17、king the area of the specimen in square inches (square mm) and dividingthe area by 1296 in.2/yd2(995 389 mm2/m2).6.6.5 Calculate the weight per square yard for each speci-men.NOTE 3The weight per square yard is determined by dividing theweight per specimen by the number of square yards of each speci
18、men.6.7 Number of Tests and Retests:6.7.1 A sample consisting of five specimens of each type oflath shall be tested. If more than two specimens fail, the samplehas failed to meet the requirements of this test.6.7.2 If one of the five test specimens fails to meet therequirements, two more additional
19、test specimens shall bechosen for retesting. If not more than one of the two additionaltest specimens fail, the sample has met the requirements of thistest.6.7.3 If more than one of the test specimens fails, the samplehas failed to meet the requirements of the test.6.8 ReportReport shall indicate th
20、e total number of speci-mens tested and the number of specimens meeting the require-ments of this specification.6.9 Precision and BiasNo statement is made about eitherthe precision or bias of this test method since the result merelystates whether or not there is conformance to the criteria forsucces
21、s specified in the procedure.7. Inspection7.1 Inspection of the material shall be agreed upon betweenthe purchaser and supplier as part of the purchase contract.8. Rejection and Rehearing8.1 Any rejection shall be based upon the specific cause offailure to conform to the requirements of this specifi
22、cation, andshall be reported to the seller within 10 working days from thereceipt of the shipment by the purchaser.8.2 Claims for rehearing shall be valid only if made within20 working days from receipt of notice of specific cause forrejection.9. Certification9.1 Where specified in the purchase orde
23、r, a producers orsuppliers certification shall be furnished to the purchaser thatthe material was manufactured in accordance with this speci-fication and has been found to meet the specified requirements.10. Marking and Identification10.1 Each bundle of metal lath shall be labeled with a tag,band, o
24、r label with the following information:10.1.1 The manufacturers identification (that is, name, logoor initials).10.1.2 Lath weight (pounds per square yard) (kilogram/meter squared).10.1.3 Meets Specification C847.10.2 Where color-coding of tags, banding, or labeling oflike members is employed the co
25、lor-coding of either thebackground color or the lettering used shall be as indicated inTable 1.11. Packaging and Package Marking11.1 Metal lath shall be packaged ten sheets per bundle, andself-furring lath shall be five or ten sheets per bundle (option ofmanufacturer).11.2 When shipped for resale, t
26、he name of the manufactureror the supplier and the brand shall be legibly marked on eachlath or package.12. Keywords12.1 gypsum cement plaster; lath; metal lath; portlandcement plaster; rib lath; self-furring; sheet lathTABLE 1 Color CodesLath Weightlb/yd2(kg/m2)Color2.5 lb/yd2(1.4 kg/m2) Blue3.4 lb
27、/yd2(1.8 kg/m2) RedC847 142SUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this standard since the last issue (C847-12)that may impact the use of this standard. (Approved June 1, 2014.)(1) Added new Section 10. (2) Added new Table 1.ASTM International takes no posi
28、tion respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibili
29、ty.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to AST
30、M International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address
31、shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 143
