1、Designation: C1788 14Standard Specification forNon Metallic Plaster Bases (Lath) Used with PortlandCement Based Plaster in Vertical Wall Applications1This standard is issued under the fixed designation C1788; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This standard provides the minimum specification foruse of non metallic plaster
3、bases with portland cement basedplaster in vertical wall applications.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. Thevalues stated in each system may not be exact equivalents;therefore, each system shall be used independently of the ot
4、her.Combining values from the two systems may result in non-conformance with the standard.1.3 Details of construction for a specific assembly toachieve the required fire resistance, sound or acoustic ratingshall be obtained from reports of fire-resistance tests, engineer-ing evaluations, or listings
5、 from recognized fire testing, soundor acoustic laboratories.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-
6、bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C926 Specification for Application of Portland Cement-Based PlasterE631 Terminology of Building ConstructionsC1764 Test Methods for Non Metallic Plaster Bases (Lath)Used with Portland Cement Based Plaster in Ver
7、tical WallApplications3. Terminology3.1 DefinitionsFor definitions of terms used in these testmethods, See Terminology E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 portland cement based plaster, nin accordance withSpecification C926.3.2.2 non metallic plaster base (lath), nmaterial
8、used as abase for portland cement based plaster that is flat or self furred,that meets or exceeds the requirements set forth in Table 1.4. Inspection4.1 Inspection of the material shall be agreed upon betweenthe purchaser and producer or supplier as part of the purchaseagreement.5. Rejection5.1 Mate
9、rial that fails to conform to the requirements of thisspecification may be rejected. Rejection should be reported tothe producer or supplier promptly and in writing. In case ofdissatisfaction with the results of the test, the producer orsupplier may make claim for a rehearing.6. Product Packaging6.1
10、 Non metallic plaster bases shall be packaged in sheets orrolls in sizes that is convenient for shipping, handling as wellas application.7. Product Marking7.1 Markings shall include the name of the producer andbrand and description of the contents shall be legibly markedon each pallet or roll.8. Per
11、formance Requirements8.1 Table 1 contains the performance requirements using thetest methods described in Test Methods C1764.9. Keywords9.1 lath; non metallic plaster base; portland cement basedplaster1This test method is under the jurisdiction ofASTM Committee C11 on Gypsumand Related Building Mate
12、rials and Systems and is the direct responsibility ofSubcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved Feb. 1, 2014. Published April 2014. DOI: 10.1520/C1788-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orc
13、ontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1ASTM International t
14、akes no 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
15、responsibility.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 addr
16、essed to 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
17、the address 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 (
18、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/).TABLE 1 Performance RequirementsProperty Method RequirementsTransverse load Refer to Tes
19、t Methods C1764 Specimens shall be tested in both positive and negative directions. Ulti-mate load is achieved when the specimen no longer maintains the appliedtest load or maximum mid span deflection exceeds L/360. Design loads, inboth directions, shall be based on applying a safety factor of 3 to
20、the aver-age ultimate loads which in no case shall be less than 75 lbf/ft2.Vertical load Refer to Test Methods C1764 Not less than 7 lb (3kg)/fastener multiplied by the appropriate safety factorusinga7in.(178mm)by16in.(406mm)tributary area/fastener.Embedment Refer to Test Methods C1764 Not less than
21、12 the total length and width of the lath shall be fully embed-ded minimum14 in. (6 mm) regardless of furring attachment at fastenerunless lath is furred from vertical supports or solid surfaces at least14 in.(6 mm).Fastener pull-through resistance Refer to Test Methods C1764 The greater of design load or 85 lbf (378 N).Alkali resistance (glass fiber lath only) Refer to Test Methods C1764 Tensile strength of all exposed and unexposed specimens shall be notless than 120 pli (21 015 N/m).C1788 142
