ASTM D7374-21

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Designation: D7374 − 08 (Reapproved 2015) D7374 − 21
Standard Practice for
Evaluating Elevated Temperature Performance of Adhesives
Used in End-Jointed Lumber
This standard is issued under the fixed designation D7374; 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 standard practice is to be used to evaluate the elevated temperature performance of adhesives used in end-jointed lumber.
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 The wall assembly shall sustain the applied load during a standard fire exposure specified in Test Methods E119 for a period
of 60 min or more.
1.4 This practice is used to evaluate the performance of adhesives used in end-jointed lumber to heat and flame under controlled
conditions, but it 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 standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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 safety, health, and healthenvironmental 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
2.1 ASTM Standards:
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
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 D7374
– 08. 08 (2015). DOI: 10.1520/D7374-08R15.10.1520/D7374-21.
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 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7374 − 21
F1667 Specification for Driven Fasteners: Nails, Spikes, and Staples
2.2 Other Standards:
ANSI/AF&PA 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 of Terms Specific to This Standard:
3.2.1 end-jointed lumber—end joint, n—lumber containing one or more end-joints.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-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”).
3.2.3 scarf joint, n—end joint formed by a single tapered profile.
3.2.4 end-jointed lumber—lumber containing one or more end joints.
4. Summary of Practice
4.1 This practice shall be used to evaluate end-jointed lumber adhesives intended for use in end-jointed lumber by fire testing a
wall assembly under a vertical load associated with the highest visual grade for the species group of Douglas Fir–Larch or Southern
Pine. The results are deemed applicable to all other species, grades, and joint configurations.
NOTE 1—In the United States, the visual grade and species with the highest capacity in the ANSI/AF&PA NDS are Select Structural Douglas-fir Larch
and Dense Select Structural Southern Pine.
5. 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 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 adhesive used in end-jointed lumber as compared with the elevated temperature
performance of solid wood.
6. Wall Assembly
6.1 A load-bearing wall meeting the following assembly description shall be used.
6.1.1 Framing Elements:
6.1.1.1 Studs—Nine pieces of 2 × 4 (nominal) end-jointed lumber shall be used for
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