ASTM_D_7374_-_08_2015.pdf

Designation:D737408(Reapproved 2015)Standard Practice forEvaluating Elevated Temperature Performance of AdhesivesUsed in End-Jointed Lumber1This standard is issued under the fixed designation D7374;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 year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This standard practice is to be used to evaluate theelevated temperature performance of adhesives used in end-jointed lumber.1.2 Asymmetric wall assembly containing end-jointed lum-ber studs is exposed to a standard fire exposure specified inTest Methods E119.1.3 The wall assembly shall sustain the applied load duringa standard fire exposure specified in Test Methods E119 for aperiod of 60 min or more.1.4 This practice is used to evaluate the performance ofadhesives used in end-jointed lumber to heat and flame undercontrolled conditions,but it does not by itself incorporate allfactors required for fire hazard or fire risk assessment underactual fire conditions.1.5 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 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 prior to use.2.Referenced Documents2.1 ASTM Standards:2C1396/C1396M Specification for Gypsum BoardD4688 Test Method for Evaluating Structural Adhesives forFinger Jointing LumberD6513 Practice for Calculating the Superimposed Load onWood-frame Walls for Standard Fire-Resistance TestsE119 Test Methods for Fire Tests of Building Constructionand MaterialsF1667 Specification for Driven Fasteners:Nails,Spikes,andStaples2.2 Other Standards:ANSI/AF&PA NDS National Design Specification for WoodConstruction33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 end-jointed lumberlumber containing one or moreend-joints.3.1.2 end-jointsa joint formed by bonding two pieces oflumber end-to-end,often by machining a set of interlocking“fingers”(finger-joint)into each end of adjoining pieces,usingan adhesive to form an adhesive bonded joint.4.Summary of Practice4.1 This practice shall be used to evaluate end-jointedlumber adhesives intended for use in end-jointed lumber by firetesting a wall assembly under a vertical load associated withthe highest visual grade for the species group of DouglasFirLarch or Southern Pine.The results are deemed applicableto all other species,grades,and joint configurations.NOTE1In the United States,the visual grade and species with thehighest capacity in the ANSI/AF&PA NDS are Select Structural Douglas-fir Larch and Dense Select Structural Southern Pine.5.Significance and Use5.1 End-jointed lumber studs used in fire resistance-ratedassemblies shall be able to support the superimposed designload for the specified time under an elevated temperatureexposure,when a wall assembly is exposed to a standard firespecified in Test Methods E119.Light-weight wood assembliesutilize gypsum wallboard or other types of membrane protec-tion to accomplish a requisite fire resistance rating for theassembly.However,wood studs and the end-joints in the studsshall resist the developed elevated temperature environment for1This practice is under the jurisdiction of ASTM Committee D07 on Wood andis the direct responsibility of Subcommittee D07.02 on Lumber and EngineeredWood Products.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 2008.Last previous edition approved in 2008 as D7374 08.DOI:10.1520/D7374-08R15.2For 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 Summary page onthe ASTM website.3Available from American Forest and Paper Association(AF&PA),1111 19thSt.,NW,Suite 800,Washington,DC 20036,http:/www.afandpa.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the duration of the rating.This practice provides a method forevaluating the elevated temperature performance of an adhe-sive used in end-jointed lumber as compared with the elevatedtemperature performance of solid wood.6.Wall Assembly6.1 A load-bearing wall meeting the following assemblydescription shall be used.6.1.1 Framing Elements:6.1.1.1 StudsNine pieces of 2 4(nominal)end-jointedlumber shall be used for wall studs.Each piece of end-jointedlumber shall be 115.5 in.(2934 mm)long and have at least oneend-joint within the middle third of the length.Studs shall besymmetrically place