1、Designation: C1764 12Standard Test Methods forNon Metallic Plaster Bases (Lath) Used with PortlandCement Based Plaster in Vertical Wall Applications1This standard is issued under the fixed designation C1764; 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 These test methods evaluate the performance of verticalwall applications of non m
3、etallic plaster bases used withPortland Cement Based Plaster under a variety of test expo-sures.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 us
4、ed independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.3 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
5、 safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C926 Specification for Application of Portland Cement-Based PlasterE330 Test Method for Structural Performance of ExteriorWindows, Doors, Skylights and Curt
6、ain Walls by UniformStatic Air Pressure DifferenceE631 Terminology of Building ConstructionsE2098 Test Method for Determining Tensile BreakingStrength of Glass Fiber Reinforcing Mesh for Use in ClassPB Exterior Insulation and Finish Systems (EIFS), afterExposure to a Sodium Hydroxide Solution2.2 ICC
7、-ES Acceptance Criteria:AC 191 Acceptance Criteria for Metal Plaster Bases (Lath)3. Terminology3.1 DefinitionsFor definitions of terms used in these testmethods, refer to Terminology E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 non metallic, plaster base (lath)material used as abase
8、 for Portland Cement Based Plaster that is flat or selffurred.4. Significance and Use4.1 General:4.1.1 Non metallic reinforced Portland Cement Based Plas-ter are vertically applied exterior wall claddings that may besubject to variety of conditions over the claddings service life.The series of tests
9、 described in this standard evaluates perfor-mance under a variety of test conditions and exposures. Anygiven project may not be subject to all of the test conditionsdescribed herein and all of the test methods may not evaluateall exposures for a given project.4.2 Transverse Load:4.2.1 This test det
10、ermines the ultimate wind load resistanceof the wall assembly including influence of the framing,sheathing, and means of attachment.4.3 Vertical Load:4.3.1 The weight and attachment mechanism of PortlandCement Based Plaster results in a vertical load transfer to theplaster base. This test method det
11、ermines the ultimate verticalload capacity of the cladding assembly based on taking thespecimen to failure.4.4 Embedment:4.4.1 Plaster bases serve as a key, reinforcement and attach-ment mechanism for Portland Cement Based Plaster. Thethickness, profile, and material properties of the plaster basesm
12、ust be such that it is adequately embedded in the PortlandCement Based Plaster. This can be accomplished through useof a self furred non metallic plaster base or other means suchas furring strips. This test procedure determines the effective-ness of the furring mechanism to ensure that the minimumem
13、bedment is obtained.4.5 Fastener Pull Through Resistance:1These test methods are under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Produ
14、cts.Current edition approved Oct. 1, 2012. Published August 2013. DOI: 10.1520/C1764-12.2For 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 Summa
15、ry page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.5.1 The non metallic lath is secured to the building frameor substrate with fasteners. This test evaluates the fastenerattachment effectiveness.4.6 Alkali Re
16、sistance (Glass Fiber Lath Only):4.6.1 Per E2098.5. Sampling, Test Specimens, and Test Units5.1 The number, size and configuration of the test speci-mens shall be as per each test procedure with the exception ofTransverse Load tests which shall incorporate wood or steelframing as determined by the u
17、ser. Samples shall be represen-tative of standard products and construction methods.6. Test Specimens6.1 Transverse Load:6.1.1 Construct three test specimens. Test specimen sizeshall be minimum 4 ft (1.2 m) by 8 ft (2.4 m) and constructedrepresentative of end use conditions. Framing members shallbe
18、wood or steel as determined by the user. C926 PortlandCement Based Plaster shall be mixed and applied in theconfiguration of the test specimen.6.2 Vertical Load:6.2.1 Construct three test frames measuring 12 inch (305mm) by 20 inch (508 mm) using nominal 2 inch (50 mm) by4 inch (100 mm) wood lumber
19、with specific gravity of 0.42.The test frame shall have one intermediate stud with top andbottom plates and sheathed one side with12 inch (13 mm) thickgypsum sheathing. Attach studs to plates using 2 16d (312 inch(89 mm) length) nails and sheathing to framing using 6d (2inch length) common nails or
20、equal fastened 8 inches (200mm) on center. A test panel shall be prepared measuring 6inches (152 mm) high by 16 inches (406 mm) wide andconsisting of a water-resistive barrier (provided to preventadhesion of the test panel to the test frame); non metallicplaster base, which is attached through the w
21、ater-resistivebarrier to the intermediate framing member with one fastener;and apply Portland Cement Based Plaster per C926. Thesamples shall be cured a minimum of 28 days. Refer to Fig. 1FIG. 1 Test AssemblyC1764 122for an illustration of the test assembly.6.3 Embedment:6.3.1 Construct one test fra
22、me using nominal 2 inch (50mm) by 4 inch (100 mm) wood lumber with specific gravity of0.42 unless specified otherwise by the manufacturer. The testframe shall be 48 inches (1.2 m) wide and high studs spaced 16inches (406 mm) on center, wood plates top and bottom andsheathed with minimum12 inch (13 m
23、m) thick wood basedsheathing. Two layers of a water resistive barrier shall beattached to the sheathing using staples 12 inches (305 mm) oncenter around the panel perimeter. A plaster stop or groundsshall be fastened around the panel perimeter. Apply the nonmetallic lath to the sample with one horiz
24、ontal lap and fastenedto the stud per the manufacturers recommendations. Apply thescratch and brown Portland Cement Based Plaster per C926.6.4 Fastener Pull Through Resistance:6.4.1 Construct five test frames using nominal 2 inch (50mm) by 4 inch (100 mm) wood framing with specific gravityof 0.42 an
25、d any other types of framing as specified by the nonmetallic lath manufacturer. The test frame shall be 12 inches(305 mm) wide and sufficient height to permit placement ofthree or more lath fasteners. One stud centered in the panel andsheathed one side with12 inch (13 mm) thick gypsumsheathing. Two
26、layers of a water resistive barrier shall beattached to the sheathing using staples 12 inches (305 mm) oncenter around the panel perimeter. A plaster stop or groundsshall be fastened around the panel perimeter. Apply the lath tothe sample with one horizontal lap and fastened to the stud perthe manuf
27、acturers recommendations. Apply the Portland Ce-ment Based Plaster per C926. Allow the stucco to cure andremove the sheathing that exists between the wood framing.6.5 Alkali Resistance (Glass Fiber Lath Only):6.5.1 Ten specimens in the warp and ten specimens in theweft directions should be cut from
28、the roll glass fiber lath andlabeled as control specimens. Ten specimens in the warp andten specimens in the weft directions should be cut from the rollglass fiber lath and labeled as conditioned specimens. Allspecimens were 2 (50 mm) inch wide by 12 (305 mm) inchlong.7. Apparatus7.1 The description
29、 of apparatus in this section is general innature consequently any set up capable of performing the testis acceptable.7.2 Transverse Load:7.2.1 The apparatus shall be capable of subjecting specimenuniformly to test conditions described in Test Method E330Procedure A.7.3 Vertical Load:7.3.1 Universal
30、 testing machine with capabilities to accom-modate section 9.2.1.7.4 Fastener Pull Through Resistance:7.4.1 Universal testing machine with capabilities to accom-modate section 9.4.1.7.5 Alkali Resistance (Glass Fiber Lath Only):7.5.1 The apparatus shall be capable of subjecting specimenuniformly to
31、test conditions described in Test Method E2098.8. Conditioning8.1 Transverse Load:8.1.1 Cure test specimens 28 days under ambient conditionsprior to testing.8.2 Vertical Load:8.2.1 Cure test specimens 28 days under ambient conditionsprior to testing.8.3 Embedment:8.3.1 Cure test specimens 28 days un
32、der ambient conditionsprior to testing.8.4 Fastener Pull Through Resistance:8.4.1 Cure test specimens 28 days under ambient conditionsprior to testing.8.5 Alkali Resistance (Glass Fiber Lath Only):8.5.1 In accordance with Test Method E2098.9. Procedure9.1 Transverse Load:9.1.1 In accordance with Tes
33、t Method E330 Procedure A.Terminate test when specified pressure can not be maintaineddue to failure of the test specimen.9.2 Vertical Load:9.2.1 Apply vertical, downward load uniformly across en-tire width of specimen, at a rate of one inch/minute until failureusing a universal testing machine. Rec
34、ord deflection, resultsand failure mechanism.9.3 Embedment:9.3.1 Cut the test panel diagonally from the intersection ofthe top stud to the intersection of the bottom stud such that thecross section of the Portland Cement Plaster is visible. Measureeach strand with respect to its embedment in the Por
35、tlandCement Plaster. Make all from the back plane of the nonmetallic lath to the back plane of the plaster.9.4 Fastener Pull Through:9.4.1 Place center stud in a rigid jig to assure each fastenerwill receive equivalent loads. Apply load in tension by pullingthe center stud away from the plaster surf
36、ace uniformly usinga universal testing machine, at a rate of two inches/minute untilfailure. Record results and failure mechanism.9.5 Alkali Resistance (Glass Fiber Lath Only):9.5.1 In accordance with Test Method E2098.10. Report10.1 Reports shall include the following information:10.1.1 Name, addre
37、ss and telephone number of the labora-tory.10.1.2 Date of test, date of report, and test report identifi-cation number.10.1.3 Reference to the test standard including any devia-tions.10.1.4 Description and identification of the non metallic lathsample including manufacturer, type and thickness of th
38、eC1764 123stucco, construction details, dimensions, framing, sheathing,application instruction and other pertinent information neededto describe the specimens.10.1.5 Specifics required by the standard including ambientconditions, photographs, illustrations, and calculations.10.1.6 Test reports shall
39、 be signed and include observations,failure mode, as well as conclusions.11. Precision and Bias11.1 Neither the precision nor bias of the test methods inthis standard have been determined.12. Keywords12.1 lath; non metallic plaster base; portland cement basedplasterASTM International takes no positi
40、on 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 responsibility
41、.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 ASTM
42、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 sh
43、own 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/).C1764 124
