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ASTM D3737-08

(Practice)

Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)

Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)

ABSTRACT
This practice details the standard procedures for establishing the allowable properties for structural glued laminated timber (glulam). Allowable properties include: stress indexes; stress modification factors associated with slop of grain; stresses for bending, tension and compression parallel to the grain; horizontal shear; compression perpendicular to the grain; radial tension and compression stresses in curved members; grade adjustment factors; modulus of elasticity; and modulus of rigidity. This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and arrangement of grades of lumber of the species considered. It does not cover the requirements for production, inspection and certification, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards.
SCOPE
1.1 This practice covers the procedures for establishing allowable properties for structural glued laminated timber. Included are the allowable stresses for bending, tension and compression parallel to the grain, horizontal shear, compression perpendicular to the grain, and radial tension and compression in curved members. Also included are modulus of elasticity and modulus of rigidity.
1.2 This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and arrangement of grades of lumber of the species considered.
1.3 Requirements for production, inspection and certification are not included, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards. Refer to ANSI/AITC A190.1 and CSA 0122.
1.4 The values stated in inch-pound units are to be regarded as standard.
1.5 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
14-Apr-2008
ICS
79.060.01 - Wood-based panels in general
Technical Committee
D07 - Wood
Drafting Committee
D07.02 - Lumber and Engineered Wood Products
Current Stage
Ref Project

Relations

Replaces
ASTM D3737-07 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
Effective Date
15-Apr-2008
Replaced By
ASTM D3737-09 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
Effective Date
01-Sep-2009
Referred By
ASTM D2915-17(2022) - Standard Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
Effective Date
15-Apr-2008
Referred By
ASTM D7199-20 - Standard Practice for Establishing Characteristic Values for Reinforced Glued Laminated Timber (Glulam) Beams Using Mechanics-Based Models
Effective Date
15-Apr-2008
Referred By
ASTM D7341-21 - Standard Practice for Establishing Characteristic Values for Flexural Properties of Structural Glued Laminated Timber by Full-Scale Testing
Effective Date
15-Apr-2008
Referred By
ASTM D5457-23 - Standard Specification for Computing Reference Resistance of Wood-Based Materials and Structural Connections for Load and Resistance Factor Design
Effective Date
15-Apr-2008
Referred By
ASTM D198-22a - Standard Test Methods of Static Tests of Lumber in Structural Sizes
Effective Date
15-Apr-2008
Referred By
ASTM D6570-18a(2023)e1 - Standard Practice for Assigning Allowable Properties for Mechanically Graded Lumber
Effective Date
15-Apr-2008
Referred By
ASTM D7147-21 - Standard Specification for Testing and Establishing Allowable Loads of Joist Hangers
Effective Date
15-Apr-2008

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ASTM D3737-08 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)ASTM D3737-08 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
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REDLINE ASTM D3737-08 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)REDLINE ASTM D3737-08 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
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REDLINE ASTM D3737-08 - Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
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Standards Content (Sample)

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: D3737 – 08
Standard Practice for
Establishing Allowable Properties for Structural Glued
1
Laminated Timber (Glulam)
This standard is issued under the fixed designation D3737; 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 D2395 Test Methods for Specific Gravity of Wood and
Wood-Based Materials
1.1 This practice covers the procedures for establishing
D2555 Practice for Establishing Clear Wood Strength Val-
allowable properties for structural glued laminated timber.
ues
Included are the allowable stresses for bending, tension and
D2915 Practice for Evaluating Allowable Properties for
compression parallel to the grain, horizontal shear, compres-
Grades of Structural Lumber
sion perpendicular to the grain, and radial tension and com-
D4761 Test Methods for Mechanical Properties of Lumber
pression in curved members. Also included are modulus of
and Wood-Base Structural Material
elasticity and modulus of rigidity.
D5456 SpecificationforEvaluationofStructuralComposite
1.2 This practice is limited to the calculation of allowable
Lumber Products
properties subject to the given procedures for the selection and
D6570 Practice for Assigning Allowable Properties for
arrangement of grades of lumber of the species considered.
Mechanically Graded Lumber
1.3 Requirements for production, inspection and certifica-
E105 Practice for Probability Sampling Of Materials
tion are not included, but in order to justify the allowable
2.2 Other Standards:
properties developed using procedures in this practice, manu-
3
ANSI/AITC A190.1 Structural Glued Laminated Timber
facturersmustconformtorecognizedmanufacturingstandards.
ANSI/AF&PA National Design Specification for Wood
Refer to ANSI/AITC A190.1 and CSA0122.
4
Construction
1.4 Thevaluesstatedininch-poundunitsaretoberegarded
5
CSA 0122 Structural Glued Laminated Timber
as standard.
1.5 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions:
responsibility of the user of this standard to establish appro-
3.1.1 alternative lumber—laminated veneer lumber (LVL),
priate safety and health practices and determine the applica-
laminated strand lumber (LSL), oriented strand lumber (OSL),
bility of regulatory limitations prior to use.
or parallel strand lumber (PSL) meeting the requirements of
2. Referenced Documents Specification D5456; or solid-sawn lumber that is produced
2 according to Practice D6570 and the grading rules of the
2.1 ASTM Standards:
applicable grading or inspection agency.
D9 Terminology Relating to Wood and Wood-Based Prod-
3.1.2 E-rated lumber—lumber graded for use in manufac-
ucts
turing structural glued laminated timber by nondestructive
D198 Test Methods of Static Tests of Lumber in Structural
measurement of a modulus of elasticity (E) and by visual
Sizes
inspection in accordance with the grading rules of the appli-
D245 Practice for Establishing Structural Grades and Re-
cable grading or inspection agency.
lated Allowable Properties for Visually Graded Lumber
3.1.3 glulam—a term used to denote structural glued lami-
nated timber, which is a product made from suitably selected
1
This practice is under the jurisdiction ofASTM Committee D07 on Wood and
andpreparedpiecesofwoodbondedtogetherwithanadhesive
is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered
Wood Products.
Current edition approved April 15, 2008. Published June 2008. Originally
3
approved in 1978. Last previous edition approved in 2007 as D3737–07. DOI: Available from theAmerican Institute ofTimber Construction, 7012 S. Revere
10.1520/D3737-08. Parkway, Suite 140, Centennial, CO 80112, https://www.aitc-glulam.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Forest and Paper Association (AF&PA), 1111 19th
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM St., NW, Suite 800, Washington, DC 20036, http://www.afandpa.org.
5
Standards volume information, refer to the standard’s Document Summary page on Available from Canadian Standards Association (CSA), 5060 Spectrum Way,
the ASTM website. Mississauga, ON L4W 5N6, Canada, http://www.csa.ca.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D3737 – 08
either in a straight or curved form with the grain of all pieces 4. Materials Requirements
essentially parallel to the longitudinal axis of the member.
4.1 Requirements for Lam
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:D3737–07 Designation: D 3737 – 08
Standard Practice for
Establishing Allowable Properties for Structural Glued
1
Laminated Timber (Glulam)
This standard is issued under the fixed designation D3737; 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
1.1 Thispracticecoverstheproceduresforestablishingallowablepropertiesforstructuralgluedlaminatedtimber.Includedare
the allowable stresses for bending, tension and compression parallel to the grain, horizontal shear, compression perpendicular to
thegrain,andradialtensionandcompressionincurvedmembers.Alsoincludedaremodulusofelasticityandmodulusofrigidity.
1.2 This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and
arrangement of grades of lumber of the species considered.
1.3 Requirements for production, inspection and certification are not included, but in order to justify the allowable properties
developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards. Refer to
ANSI/AITC A190.1 and CSA 0122.
1.4 The values stated in inch-pound units are to be regarded as standard.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D9 Terminology Relating to Wood and Wood-Based Products
D198 Test Methods of Static Tests of Lumber in Structural Sizes
D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D2395 Test Methods for Specific Gravity of Wood and Wood-Based Materials
D2555 Practice for Establishing Clear Wood Strength Values
D2915 Practice for Evaluating Allowable Properties for Grades of Structural Lumber
D4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material
D5456 Specification for Evaluation of Structural Composite Lumber Products
D6570 Practice for Assigning Allowable Properties for Mechanically Graded Lumber
E105 Practice for Probability Sampling Of Materials
2.2 Other Standards:
3
ANSI/AITC A190.1 Structural Glued Laminated Timber
4
ANSI/AF&PA National Design Specification for Wood Construction
5
CSA 0122 Structural Glued Laminated Timber
3. Terminology
3.1 Definitions:
3.1.1 Aalternative lumber—laminated veneer lumber (LVL), laminated strand lumber (LSL), oriented strand lumber (OSL), or
parallel strand lumber (PSL) meeting the requirements of Specification D5456,; or solid-sawn lumber that is produced according
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 April 1, 2007.15, 2008. Published April 2007.June 2008. Originally approved in 1978. Last previous edition approved in 20062007 as
D3737–067.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from the American Institute of Timber Construction, 7012 S. Revere Parkway, Suite 140, Englewood,Centennial, CO 80112, https://www.aitc-glulam.org.
4
Available from American Forest and Paper Association (AF&PA), 1111 19th St., NW, Suite 800, Washington, DC 20036, http://www.afandpa.org.
5
Available from Canadian Standards Association (CSA), 178 Rexdale Blvd., Toronto, ON Canada M9W1R3.
5
Available from Canadian Standards Association (CSA), 5060 Spectrum Way, Mississauga, ON L4W 5N6, Canada, http://www.csa.ca.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D3737–08
to Practice D6570and the grading rules of the applicable grading or inspection agency.
3.1.2 E-rated lumber—lumber graded for use in manufacturing structural glued laminated timber by nondestructive
measurementofamodulusofelasticity(E)andbyvisualinspectioninaccordancewiththegradingrulesoftheapplicablegrading
or inspection agency.
3.1.3 g
...

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ABSTRACT
This practice details the standard procedures for establishing the allowable properties for structural glued laminated timber (glulam). Allowable properties include: stress indexes; stress modification factors associated with slop of grain; stresses for bending, tension and compression parallel to the grain; horizontal shear; compression perpendicular to the grain; radial tension and compression stresses in curved members; grade adjustment factors; modulus of elasticity; and modulus of rigidity. This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and arrangement of grades of lumber of the species considered. It does not cover the requirements for production, inspection and certification, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards.
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ASTM
ASTM D4933-16(2021)(Guide)
Standard Guide for Moisture Conditioning of Wood and Wood-Based Materials

SIGNIFICANCE AND USE
4.1 Many physical and mechanical properties of wood and wood-based materials change in response to the environmental equilibrium moisture content, and any comparison of these properties must take moisture content into account. A consistent base for comparison among different test samples and different laboratories is necessary. Shrinkage and dimensional change in particular are dependent on moisture content, and tests involving their measurement must be conducted with good equilibrium moisture content control. Conditioning can also be important in industrial settings where there are optimum moisture content levels for many products and processes, and conformance to these levels can reduce losses in quality and yield.
SCOPE
1.1 This guide covers standard procedures for conditioning and equilibrating wood and wood-based materials to constant moisture content. The procedures apply to solid wood, wood-based fiber and particulate materials and panels, and wood products containing adhesives. They are intended for use in research and development activities, testing laboratories, quality control, and for all other classes of producers and users. This guide includes background material on the importance of moisture content control, important definitions and technical data, possible types of apparatus, procedures, and the importance of conditioning time. Users should recognize that the necessary degree of precision and bias varies with the intentions of the users. Some research and testing, for example, might require very close control of moisture content, whereas control in an industrial storage facility might not require such close control. This guide offers procedures that include these different requirements.  
1.2 The values stated in SI units are to be regarded as standard. The values of temperature in degrees Fahrenheit given in Table X1.2 are mathematical conversions that are provided for information only and are not considered standard.  
1.3 The following safety hazards caveat pertains only to the procedure section, Section 6, of this guide. 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.  
1.4 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.

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ASTM
ASTM D7612-21(Practice)
Standard Practice for Categorizing Wood and Wood-Based Products According to Their Fiber Sources

SIGNIFICANCE AND USE
5.1 Voluntary forest certification systems have become an important factor in promoting sustainable forest management. The standards in use are highly variable, however. Even within a family of standards with a common label there is the potential for wide variations in practices. This prevents producers and consumers from using a certification label to characterize products according to a specific set of qualities or values. This practice creates a framework to differentiate products based on a set of qualities and values identified as important in the market for wood products. (A) See Appendix X3 for discussion of additional concepts related to sub-categorization of certified sources.(B) For the purposes of categorizing products under this practice, distributors and retailers can rely on “on-product” labels for chain of custody or a certified procurement system if they are not engaged in significant value-added processing or remanufacture. In lieu of an on‐product label, a certificate of compliance indicating conformance with the applicable chain of custody or certified procurement system is permitted.  
5.2 This practice is intended to be used by producers, distributors, retailers, or consumers who wish to understand where a product fits within three categories. At a minimum, the user will need to know the geographic origin of the wood going into a product and whether it is labeled or otherwise certified to a procurement system or chain of custody based on a voluntary forest management or certification standard. Producers who want to use this practice must be able to identify the geographic origin of the wood to at least the level needed to support the claims to consumers associated with a given category and described in 6.1.
SCOPE
1.1 This practice sets forth minimum criteria and evaluation requirements for products employing the use of different systems to trace wood fiber to sources operating under different forest management or forest certification systems.  
1.2 The purpose of this practice is to provide wood products manufacturers, distributors, and retailers with a system to provide clear, objective information to communicate to consumers regarding product conformance to different wood fiber tracing systems within specific forest management or forest certification programs. It provides a structure that segregates the different types of labels and tracing systems in use among major forest certification standards and other voluntary and regulatory standards governing the production of forest products.
Note 1: The principles in this practice apply internationally, provided that the required information is available to support categorization. For example, products certified to the globally recognized forest certification standards will meet the “Certified Sources” category regardless of their origin, and documented risk assessments (noted in Appendix X5) provide the basis upon which raw materials sourced from Canada and the United States can be deemed to meet the “Legal Sources” category. To categorize raw materials sourced outside of Canada and the United States as “Legal Sources,” it is recommended that the adopting entity develop supplemental provisions to address country-specific issues as needed.  
1.2.1 This practice provides an objective basis to differentiate among:
1.2.1.1 Non-controversial (that is, legal) sources of forest products,
1.2.1.2 Responsible sources of forest products (that is, non-controversial sources together with certified procurement systems or from forests managed using responsible practices), and
1.2.1.3 Certified sources of forest products (that is, non-controversial sources together with certified chain of custody).  
1.2.2 This practice is intended to provide a framework to help wood product vendors identify the competent and reliable evidence needed to substantiate product claims as required by the U.S. Federal Trade Commission’s Guides for ...

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ASTM
ASTM D1166-21(Test Method)
Standard Test Method for Methoxyl Groups in Wood and Related Materials

SIGNIFICANCE AND USE
3.1 Most of the methoxyl in wood is attributable to the lignin. This test method is used extensively in the study of lignin.
SCOPE
1.1 This test method covers the determination of methoxyl groups in wood and related materials (1-7).2 The test method is applicable to milled wood or sawdust, or by suitable adjustment in size of the test specimen, to fractions isolated from wood and lignin.  
1.2 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. Specific precautionary statements are given in Section 6.  
1.3 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.

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