1、Designation: C1787 14Standard Specification forInstallation of Non Metallic Plaster Bases (Lath) Used withPortland Cement Based Plaster in Vertical WallApplications1This standard is issued under the fixed designation C1787; the number immediately following the designation indicates the year oforigin
2、al adoption or, 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 specification applies to the minimum installationrequirement
3、s for non metallic plaster bases used with portlandcement based plaster in vertical wall applications.1.2 Where a fire resistance rating is required for plasteredassemblies and constructions, details of construction shall be inaccordance with reports of fire tests of assemblies that havemet the requ
4、irements of the fire rating imposed.1.3 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 other.Combining values from the two
5、systems may result in non-conformance with the standard.1.4 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 from recognized fire testing, sou
6、ndor acoustic laboratories.1.5 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-bility of regulatory limitations p
7、rior to use.2. Referenced Documents2.1 ASTM Standards:2C926 Specification for Application of Portland Cement-Based PlasterC954 Specification for Steel Drill Screws for theApplicationof Gypsum Panel Products or Metal Plaster Bases to SteelStuds from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) inThickn
8、essC1063 Specification for Installation of Lathing and Furringto Receive Interior and Exterior Portland Cement-BasedPlasterE631 Terminology of Building ConstructionsC1788 Specification for Non Metallic Plaster Bases (Lath)Used with Portland Cement Based Plaster in Vertical WallApplications3. Termino
9、logy3.1 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, nsee SpecificationC926.3.2.2 non metallic plaster base (lath), nmaterial used as abase for portland cement based plaster
10、 that is self furred andmeets or exceeds the requirements set forth in SpecificationC1788.3.2.3 framing member, nsee Specification C1063.4. Delivery and Storage of Materials4.1 All materials shall be delivered in original, undamagedcontainers.4.2 Store materials inside or under cover protected fromw
11、eather.5. Coordination and Scheduling5.1 Coordinate and schedule installation of non metallicplaster base with related work of other sections.6. Materials6.1 Materials shall conform to the requirements of thereferenced specifications and standards and to the requirementsspecified herein.6.2 Portland
12、 Cement Based Plaster, in accordance withSpecification C926.1This test method is under the jurisdiction ofASTM Committee C11 on Gypsumand Related Building Materials and Systems and is the direct responsibility ofSubcommittee C11.03 on Specifications for the Application of Gypsum and OtherProducts in
13、 Assemblies.Current edition approved Feb. 1, 2014. Published April 2014. DOI: 10.1520/C1787-14.2For 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 Documen
14、t Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.3 Accessories, in accordance with Specification C1063.7. Application of Accessories7.1 In accordance with Specification C1063.8. Application of Non Me
15、tallic Plaster Bases8.1 WorkmanshipNon metallic plaster base shall be in-stalled so the finished plaster surfaces are true to line, level,plumb, square, or curved as required to receive the specifiedplaster thickness.8.2 Application of Non Metallic Plaster Base:8.2.1 Non metallic plaster bases shall
16、 be attached to framingmembers at not more than 7 in. (178 mm) along framingmembers spaced not more than 16 in. (406 mm) on center.8.2.2 Non metallic plaster base shall be installed over solidbacking or sheathing sufficiently rigid to permit portlandcement plaster application.8.2.3 Non metallic plas
17、ter base shall be applied with thelong dimension at right angles to the supports unless approvedotherwise by the manufacturer and justified through compli-ance with the performance requirements set forth in Specifi-cation C1788.8.2.4 Ends of adjoining non metallic plaster bases shall bestaggered in
18、a running bond pattern with adjacent rows of nonmetallic plaster base.8.2.5 Non metallic plaster base shall not be continuousthrough control joints but shall be stopped and fastened at eachside.8.2.6 Non metallic plaster base shall only be installed tovertical surfaces.8.3 Attachment of Non Metallic
19、 Plaster Bases to WoodFraming:8.3.1 Non metallic plaster base shall be attached to framingmembers spaced not more than 16 in. (406 mm) on center withattachments spaced not more than 7 in. (178 mm) on centeralong supports.8.3.2 Non metallic plaster base shall be attached withmanufacturer recommended
20、fasteners. Staples shall be mini-mum 16 gauge with crowns not less than34 in. (19 mm),engage not less than two strands of non metallic plaster baseand penetrate the wood framing members not less than34 in.(19 mm).8.4 Attachment of Non Metallic Plaster Bases to MetalFraming:8.4.1 Non metallic plaster
21、 base shall be attached to framingmembers spaced not more than 16 in. (406 mm) on center withattachments spaced not more than 7 in. (178 mm) on centeralong supports.8.4.2 Non metallic plaster bases shall be attached withmanufacturers recommended fasteners. Specification C954screws or pneumatic pins
22、and corrosion resistant washers shallengage not less than two strands of the non metallic plasterbase and attach it to metal framing members. Screw fastenersshall extend through the steel connection a minimum of threeexposed threads. Pneumatic pins shall extend through the steelconnection in accorda
23、nce with the minimum depth recom-mended by the pin manufacturer.8.5 Attachment of Non Metallic Plaster Bases to Concreteor Concrete Masonry Units:8.5.1 Non metallic plaster base shall be attached to concreteor concrete masonry units with attachments spaced not morethan 7 in. (178 mm) on center in ro
24、ws not more than 16 in. (406mm) on center.8.5.2 Non metallic plaster bases shall be attached withmanufacturers recommended fasteners. Masonry, power, orpowder actuated fastener and corrosion resistant washers shallengage not less than two strands of non metallic plaster base.Minimum fastener penetra
25、tion into the concrete or concretemasonry units shall be not less than34 in. (19 mm).8.6 Lapping of Non Metallic Plaster Bases:8.6.1 Side and end laps shall be 3 in. (76 mm) minimumunless justified through compliance with the performancerequirements set forth in Specification C1788 and recom-mended
26、by the manufacturer.9. Keywords9.1 lath; non metallic plaster base; portland cement basedplasterASTM International takes 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 determin
27、ation of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own 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 wit
28、hdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed 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 yo
29、ur comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at 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 (sin
30、gle 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/).C1787 142
