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ASTM D7470-08

(Practice)

Standard Practice for Evaluating Elevated Temperature Performance of End-Jointed Lumber Studs

Standard Practice for Evaluating Elevated Temperature Performance of End-Jointed Lumber Studs

SIGNIFICANCE AND USE
End-jointed lumber studs used in fire resistance-rated assemblies shall be able to support the superimposed design load for the specified time under an elevated temperature exposure, when a wall assembly is exposed to a standard fire specified in Test Methods E 119. Light-weight wood assemblies utilize gypsum wallboard or other types of membrane protection to accomplish a requisite fire resistance rating for the assembly. However, wood studs and the end-joints in the studs shall resist the developed elevated temperature environment for the duration of the rating. This practice provides a method for evaluating the elevated temperature performance of an assembly constructed with end-jointed studs having fire performance comparable to an assembly constructed with solid-sawn studs.
SCOPE
1.1 This practice is to be used to evaluate the elevated temperature performance of end-jointed lumber studs.  
1.2 A symmetric wall assembly containing end-jointed lumber studs is exposed to a standard fire exposure specified in Test Methods E 119.
1.3 End-jointed lumber studs are deemed qualified if the wall assembly resists a standard fire exposure specified in Test Methods E 119 for a period of 60 min or more. Qualification of end-jointed lumber studs are restricted to the joint configuration and adhesive tested.
1.4 This practice is used to evaluate the performance of end-jointed lumber studs to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment under actual fire conditions.  
1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Jul-2008
ICS
91.080.20 - Timber structures
Technical Committee
D07 - Wood
Drafting Committee
D07.02 - Lumber and Engineered Wood Products
Current Stage
Ref Project

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ASTM D7470-08 - Standard Practice for Evaluating Elevated Temperature Performance of End-Jointed Lumber StudsASTM D7470-08 - Standard Practice for Evaluating Elevated Temperature Performance of End-Jointed Lumber Studs
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ASTM D7470-08 - Standard Practice for Evaluating Elevated Temperature Performance of End-Jointed Lumber Studs
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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
Designation: D7470 − 08
StandardPractice for
Evaluating Elevated Temperature Performance of End-
Jointed Lumber Studs
This standard is issued under the fixed designation D7470; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E119Test Methods for Fire Tests of Building Construction
and Materials
1.1 This practice is to be used to evaluate the elevated
F1667SpecificationforDrivenFasteners:Nails,Spikes,and
temperature performance of end-jointed lumber studs.
Staples
1.2 Asymmetricwallassemblycontainingend-jointedlum-
2.2 Other Standards:
ber studs is exposed to a standard fire exposure specified in
NDSNational Design Specification for Wood Construction
Test Methods E119.
3. Terminology
1.3 End-jointed lumber studs are deemed qualified if the
wall assembly resists a standard fire exposure specified in Test
3.1 Definitions:
Methods E119 for a period of 60 min or more. Qualification of 3.1.1 end-jointed lumber—Lumber containing one or more
end-jointed lumber studs are restricted to the joint configura-
end-joints.
tion and adhesive tested.
3.1.2 end-joints—a joint formed by bonding two pieces of
1.4 This practice is used to evaluate the performance of lumber end-to-end, often by machining a set of interlocking
“fingers” (finger-joint) into each end of adjoining pieces, using
end-jointed lumber studs to heat and flame under controlled
conditions, but does not by itself incorporate all factors an adhesive to form an adhesive bonded joint.
requiredforfirehazardorfireriskassessmentunderactualfire
3.1.3 qualified agency—an organization, hereafter referred
conditions.
to as the agency, that has trained personnel and procedures to
ensure the grades comply with all applicable requirements of
1.5 Thevaluesstatedininch-poundunitsaretoberegarded
thispractice.Theagencyshallhavenofinancialinterestin,nor
as the standard. The values given in parentheses are for
shall be financially dependent upon, any single company
information only.
manufacturing the product being inspected or tested; and shall
1.6 This standard does not purport to address all of the
not be owned, operated, or controlled by any such company.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety and health practices and determine the applica-
4.1 This practice shall be used to evaluate end-jointed
bility of regulatory limitations prior to use.
lumber studs manufactured with a specific joint configuration
and adhesive. This practice is intended to be limited to the
2. Referenced Documents
evaluation of end-jointed lumber studs with a specific joint
2.1 ASTM Standards:
configuration, adhesive, and limited design properties. The
C1396/C1396MSpecification for Gypsum Board
results are only applicable to end-jointed lumber studs using a
D4688Test Method for Evaluating StructuralAdhesives for
joint configuration with the same number of fingers and a
Finger Jointing Lumber
finger length of at least equal length as qualified in 7.1.2 and
D6513Practice for Calculating the Superimposed Load on
shall have assigned design properties no greater than the grade
Wood-frame Walls for Standard Fire-Resistance Tests
level qualified in 7.1.2.
5. Significance and Use
This practice is under the jurisdiction ofASTM Committee D07 on Wood and
is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered
5.1 End-jointed lumber studs used in fire resistance-rated
Wood Products.
assemblies shall be able to support the superimposed design
Current edition approved Aug. 1, 2008. Published September 2008. DOI:
load for the specified time under an elevated temperature
10.1520/D7470-08.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican Wood Council (AWC), 1111 Nineteenth Street, NW,
the ASTM website. 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 States
D7470 − 08
curing temperature of the adhesive in accordance with the adhesive
exposure, when a wall assembly is exposed to a standard fire
manufacturer’s recommendations.
specifiedinTestMethodsE119.Light-weightwoodassemblies
utilize gypsum wallboard or other types of membrane protec-
6.1.1.2 Plates—Studsshallbeattachedtoadoubletopplate
tion to accomplish a requisite fire resistance rating for the
andasinglebottomplateasshowninFig.1.Platesshallbethe
assembly. However, wood studs and the end-joints in the studs
same species as the stud material. The first top plate and the
shallresistthedevelopedelevatedtemperatureenvironmentfor
bottomplateshallbeattachedtothestudsusing2-16dcommon
the duration of the rating. This practice provides a method for
nailsor3-16dboxnails.Thesecondtopplateisattachedtothe
evaluating the elevated temperature performance of an assem-
first top plate using a single row of 16d common nail at 16 in.
blyconstructedwithend-jointedstudshavingfireperformance
(406 mm) on center or 1-16d box nails at 12 in. (305 mm) on
comparable to an assembly constructed with solid-sawn studs.
center. Nails shall be in accordance with Specification F1667.
NOTE 2—In Fig. 1, double top plates are located at the bottom of t
...

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SIGNIFICANCE AND USE
5.1 End-jointed lumber studs used in fire resistance-rated assemblies shall be able to support the superimposed design load for the specified time under an elevated temperature exposure, when a wall assembly is exposed to a standard fire specified in Test Methods E119. Light-weight wood assemblies utilize gypsum wallboard or other types of membrane protection to accomplish a requisite fire resistance rating for the assembly. However, wood studs and the end joints in the studs shall resist the developed elevated temperature environment for the duration of the rating. This practice provides a method for evaluating the elevated temperature performance of an assembly constructed with end-jointed studs having fire performance comparable to an assembly constructed with solid-sawn studs.
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SIGNIFICANCE AND USE
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