ASTM D7470-21

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

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.
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 E119.  
1.3 End-jointed lumber studs are deemed qualified if the wall assembly resists a standard fire exposure specified in Test Methods E119 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 14-Jul-2021
• ICS: 91.080.20 - Timber structures
• Technical Committee: D07 - Wood
• Drafting Committee: D07.02 - Lumber and Engineered Wood Products

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7470 − 21
Standard Practice for
Evaluating Elevated Temperature Performance of End-
1
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 2. Referenced Documents
2
1.1 This practice is to be used to evaluate the elevated 2.1 ASTM Standards:
temperature performance of end-jointed lumber studs. C1396/C1396MSpecification for Gypsum Board
D9Terminology Relating to Wood and Wood-Based Prod-
1.2 Asymmetricwallassemblycontainingend-jointedlum-
ucts
ber studs is exposed to a standard fire exposure specified in
D4688Test Method for Evaluating StructuralAdhesives for
Test Methods E119.
Finger Jointing Lumber
1.3 End-jointed lumber studs are deemed qualified if the
D6513Practice for Calculating the Superimposed Load on
wall assembly resists a standard fire exposure specified in Test
Wood-frame Walls for Standard Fire-Resistance Tests
Methods E119 for a period of 60 min or more. Qualification of
E119Test Methods for Fire Tests of Building Construction
end-jointed lumber studs are restricted to the joint configura-
and Materials
tion and adhesive tested.
F1667SpecificationforDrivenFasteners:Nails,Spikes,and
1.4 This practice is used to evaluate the performance of Staples
end-jointed lumber studs to heat and flame under controlled
2.2 Other Standards:
conditions, but does not by itself incorporate all factors
ANSI/AWC NDSNational Design Specification for Wood
3
required for fire hazard or fire risk assessment under actual fire
Construction
conditions.
3. Terminology
1.5 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for 3.1 Definitions:
information only. 3.1.1 For general definitions of terms related to wood, refer
to Terminology D9.
1.6 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.2.1 end joint, n—joint formed by adhesive bonding of
responsibility of the user of this standard to establish appro-
machined, mated surfaces at the ends of two pieces of lumber.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.2.1.1 Discussion—Typical end-joint configurations in-
1.7 This international standard was developed in accor-
clude finger joints and scarf joints.
dance with internationally recognized principles on standard-
3.2.2 end-jointed lumber, n—lumbercontainingoneormore
ization established in the Decision on Principles for the
end joints.
Development of International Standards, Guides and Recom-
3.2.3 fingerjoint,n—endjointformedbymultipleinterlock-
mendations issued by the World Trade Organization Technical
ing tapered profiles (“fingers”).
Barriers to Trade (TBT) Committee.
1 2
This practice is under the jurisdiction ofASTM Committee D07 on Wood and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Wood Products. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved July 15, 2021. Published August 2021. Originally the ASTM website.
3
approved in 2008. Last previous edition approved in 2015 as D7470 – 08 (2015). Available fromAmerican Wood Council (AWC), 1111 Nineteenth Street, NW,
DOI: 10.1520/D7470-21. 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
1

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D7470 − 21
3.2.4 scarf joint, n—end joint formed by a single tapered bly constructed with end-jointed studs having fire performance
profile. comparable to an assembly constructed with solid-sawn studs.
4. Summary of Practice
6. Wall Assembly
4.1 This practice shall be used to evaluate end-jointed
6.1 A load-bearing wall meeting the following assembly
lumber studs manufactured with a specific joint configuration
description shall be used:
and adhesive. This practice is intended to be limited to the
6.1.1 Framing Elements:
evaluation of end-jointed lumber studs with a specific joint
6.1.1.1 Studs—Nine pieces of 2 by 4 (nominal) end-jointed
configuration, adhesive, and limited design properties. Th
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7470 − 08 (Reapproved 2015) D7470 − 21
Standard Practice for
Evaluating Elevated Temperature Performance of End-
1
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. 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 E119.
1.3 End-jointed lumber studs are deemed qualified if the wall assembly resists a standard fire exposure specified in Test Methods
E119 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.
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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
1
This practice is under the jurisdiction of ASTM Committee D07 on Wood and is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered Wood
Products.
Current edition approved May 1, 2015July 15, 2021. Published June 2015August 2021. Originally approved in 2008. Last previous edition approved in 20082015 as D7470
– 08. 08 (2015). DOI: 10.1520/D7470-08R15.10.1520/D7470-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7470 − 21
C1396/C1396M Specification for Gypsum Board
D9 Terminology Relating to Wood and Wood-Based Products
D4688 Test Method for Evaluating Structural Adhesives for Finger Jointing Lumber
D6513 Practice for Calculating the Superimposed Load on Wood-frame Walls for Standard Fire-Resistance Tests
E119 Test Methods for Fire Tests of Building Construction and Materials
F1667 Specification for Driven Fasteners: Nails, Spikes, and Staples
2.2 Other Standards:
3
ANSI/AWC NDS National Design Specification for Wood Construction
3. Terminology
3.1 Definitions:
3.1.1 For general definitions of terms related to wood, refer to Terminology D9.
3.2 Definitions:Definitions of Terms Specific to This Standard:
3.2.1 end joint, n—joint formed by adhesive bonding of machined, mated surfaces at the ends of two pieces of lumber.
3.2.1.1 Discussion—
Typical end-joint configurations include finger joints and scarf joints.
3.2.2 end-jointed lumber—lumber, n—Lumberlumber containing one or more end-joints.end joints.
3.2.3 end-joints—finger joint, n—aend joint formed by bonding two pieces of lumber end-to-end, often by machining a set of
interlocking “fingers” (finger-joint) into each end of adjoining pieces, using an adhesive to form an adhesive bonded joint.multiple
interlocking tapered profiles (“fingers”).
3.2.4 qualified agency—scarf joint, n—an organization, hereafter referred t
...