ASTM_D_7470_-_08_2015.pdf

Designation:D747008(Reapproved 2015)Standard Practice forEvaluating Elevated Temperature Performance of End-Jointed Lumber Studs1This standard is issued under the fixed designation D7470;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 practice is to be used to evaluate the elevatedtemperature performance of end-jointed lumber studs.1.2 Asymmetric wall assembly containing end-jointed lum-ber studs is exposed to a standard fire exposure specified inTest Methods E119.1.3 End-jointed lumber studs are deemed qualified if thewall assembly resists a standard fire exposure specified in TestMethods E119 for a period of 60 min or more.Qualification ofend-jointed lumber studs are restricted to the joint configura-tion and adhesive tested.1.4 This practice is used to evaluate the performance ofend-jointed lumber studs to heat and flame under controlledconditions,but does not by itself incorporate all factorsrequired for fire hazard or fire risk assessment under actual fireconditions.1.5 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.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:NDS National Design Specification for Wood Construction33.Terminology3.1 Definitions: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.3.1.3 qualified agencyan organization,hereafter referredto as the agency,that has trained personnel and procedures toensure the grades comply with all applicable requirements ofthis practice.The agency shall have no financial interest in,norshall be financially dependent upon,any single companymanufacturing the product being inspected or tested;and shallnot be owned,operated,or controlled by any such company.4.Summary of Practice4.1 This practice shall be used to evaluate end-jointedlumber studs manufactured with a specific joint configurationand adhesive.This practice is intended to be limited to theevaluation of end-jointed lumber studs with a specific jointconfiguration,adhesive,and limited design properties.Theresults are only applicable to end-jointed lumber studs using ajoint configuration with the same number of fingers and afinger length of at least equal length as qualified in 7.1.2 andshall have assigned design properties no greater than the gradelevel qualified in 7.1.2.5.Significance and Use5.1 End-jointed lumber studs used in fire resistance-ratedassemblies shall be able to support the superimposed design1This 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 D7470 08.DOI:10.1520/D7470-08R15.2For 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 Wood Council(AWC),1111 Nineteenth Street,NW,Suite 800,Washington,DC 20036,http:/www.awc.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 load 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 forthe duration of the rating.This practice provides a method forevaluating the elevated temperature performance of an assem-bly constructed with end-jointed studs having fire performancecomparable to an assembly c