1、Designation: C847 10Standard 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 Department of Defense.1. Scope*1.1 This specification covers sheet lath, expanded metallath, diamond mesh, flat and self-furrin
3、g, 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 that
4、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-rolled c
5、arbonsteel 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, orinstallation
6、. 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). The
7、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 WeightTh
8、e nominal weight of metal lath shall be asfollows:4.4.1 U.S. Nominal 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 Nominal Weights:Type: Weight, lb/yd2(kg/m2)Diamond mesh 2.5 (1.4); 3.0 (1.6)
9、; 3.4 (1.8)Flat rib 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., + 1 in. (25.4 mm).4.5.4 Weight, 6 10 %.5. Finish5
10、.1 Metal lath shall 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 t
11、est methodwith service 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).1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsi
12、bilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1977. Last previous edition approved in 2009 as C84709. DOI:10.1520/C0847-10.2For referenced ASTM standards, visit the
13、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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Ba
14、rr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2.2 Tape Measure, capable of measuring in increments of116 in (1.6 mm).6.3 Materials shall satisfy the following:6.3.1 Metal LathSpecification C847.6.4 SamplingOne sheet shall be selected from eachbundle or package, but
15、not more than five 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 b
16、efolded.6.6 Procedure: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
17、determined bytaking the area of the specimen in square inches (square mm) and dividingthe area by 1296 in2/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
18、 of each specimen.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 mo
19、re additional 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 sha
20、ll indicate the 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 crit
21、eria forsuccess 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 o
22、f this specification, 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
23、 purchase order, a producers orsuppliers certification shall be furnished to the purchaser thatthe material was in accordance with this specification and hasbeen found to meet the specified requirements.10. Packaging and Package Marking10.1 Metal lath shall be packaged ten sheets per bundle, andself
24、-furring lath shall be five or ten sheets per bundle (option ofmanufacturer).10.2 When shipped for resale, the name of the manufactureror the supplier and the brand shall be legibly marked on eachlath or package.11. Keywords11.1 gypsum cement plaster; lath; metal lath; portlandcement plaster; rib la
25、th; self-furring; sheet lathSUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this specification since the last issue,C84709, that may impact the use of this specification. (Approved May 1, 2010)(1) Revised 4.2, 4.3, and 4.5.3.(2) Deleted Sheet lath4.5 lb/yd2from 4.4
26、.1.(3) Added new Section 6.Committee C11 has identified the location of selected changes to this specification since the last issue,C84706, that may impact the use of this specification. (Approved May 1, 2009)(1) Revised the tolerance in 4.5.2 from316 in. to38 in.C847 102ASTM International takes no
27、position 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 responsi
28、bility.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
29、 ASTM 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 addr
30、ess 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 ASTM website (www.astm.org/COPYRIGHT/).C847 103
