ASTM_C_37_-_C_37M_-_01e1.pdf

Designation:C 37/C 37M 01e1Standard Specification forGypsum Lath1This standard is issued under the fixed designation C 37/C 37M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1NOTEThe word rating(s)was added to the term fire resistance throughout editorially October 2004.1.Scope*1.1 This specification covers plain and foil-backed types ofgypsum lath which is designed to be used as a base forapplication of gypsum plaster(see Specification C 28).NOTE1Specification C 841 contains application procedures for inte-rior lathing and furring,and Specification C 842 contains applicationprocedures for interior gypsum plaster.1.2 The values stated in either inch-pound or SI(metric)units are to be regarded separately as standard.Within the text,the SI units are shown in brackets.The values stated in eachsystem shall be used independent of the other.Values from thetwo systems shall not be combined.1.3 The text of this standard references notes and footnotesthat provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.2.Referenced Documents2.1 ASTM Standards:C 11 Terminology Relating to Gypsum and Related Build-ing Materials and Systems2C 28 Specification for Gypsum Plasters2C 473 Test Methods for Physical Testing of Gypsum PanelProducts2C 841 Specification for Installation of Interior Lathing andFurring2C 842 Specification for Application of Interior GypsumPlaster2C 1264 Specification for Sampling,Inspection,Rejection,Certification,Packaging,Marking,Shipping,Handling,and Storage of Gypsum Board2E 96 Test Methods for Water Vapor Transmission of Mate-rials3E 119 Test Methods for Fire Tests of Building Constructionand Materials43.Terminology3.1 Definitions of terms shall be in accordance with Termi-nology C 11.4.Materials and Manufacture4.1 Plain gypsum lath shall consist of a noncombustiblecore,essentially gypsum,surfaced with paper bonded to thecore.4.2 Foil-backed gypsum lath shall consist of plain gypsumlath with a layer of aluminum foil laminated to the backsurface.NOTE2Foil-backed gypsum lath shall be installed with the foilsurface against the framing members.The foil surface is not adapted toreceive or retain plaster.4.3 Gypsum lath,type X(special fire-resistant)designatesgypsum lath complying with this specification that provides notless than 1-h fire resistance rating for lath38in.9.5 mmthick,applied perpendicular with and on each side of loadbearing 2 3 4 wood studs spaced 16 in.406 mm o.c.withblue lath nails,118in.29 mm long,0.092 in.2.3 mmdiameter shank,1964in.7.5 mm diameter heads,spaced 5 in.127 mm o.c.with lath joints staggered 16 in.406 mm oneach side of the partition,over which is applied12in.12.7mm of 1:2 gypsum sand plaster,and tested in accordance withthe requirements of Test Method E 119.NOTE3Consult producers for independent test data on assemblydetails and fire resistance ratings for other types of construction.See firetest reports,or listings from recognized fire testing laboratories,forassembly particulars,materials,and ratings.NOTE4The definition of type X as given in 4.3 is intended only as atest to define the gypsum lath as meeting the requirements of type X.Thistest does not indicate a preferred application nor does it limit the use of theproduct in other fire rated assemblies.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved May 10,2001.Published July 2001.Originallypublished as C 37 21 T.Last previous edition C 37 99.2Annual Book of ASTM Standards,Vol 04.01.3Annual Book of ASTM Standards,Vol 04.06.4Annual Book of ASTM Standards,Vol 04.07.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information 5.Physical Properties5.1 Specimens shall be taken from the samples obtained inaccordance with Specification C 1264.5.2 Specimens shall be tested in accordance with TestMethods C 473.5.2.1 Flexural StrengthThe specimens shall be tested faceup and face down.The average breaking load shall be not lessthan the following:Method AMethod BThickness,in.mmLoad,lbf NBearing EdgesAcross Fiberof SurfacingLoad,lbf NBearing EdgesParallel toFiber ofSurfacingLoad,lbf NBearing EdgesAcross Fiberof SurfacingLoad,lbf NBearing EdgesParalle