Timber -- Finger joints -- Minimum production requirements and testing methods

ISO 10983:2014 specifies minimum requirements for the manufacture and testing of bonded finger joints in structural wood products such as glued laminated timber, cross-laminated timber, and finger-jointed timber. Although most finger joints are produced in coniferous species (softwoods), ISO 10983:2014 also applies to broadleafed species (hardwoods) where information is available to enable them to be satisfactorily bonded. It does not cover impressed (die-formed) joints and, in the case of laminated timber products, it applies only to individual laminations. Large finger joints in glued laminated timber are not covered by ISO 10983:2014.

Bois -- Aboutages -- Exigences minimales de production et méthodes d'essais

General Information

Status
Published
Publication Date
21-Apr-2014
Current Stage
6060 - International Standard published
Start Date
28-Feb-2014
Completion Date
22-Apr-2014
Ref Project

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INTERNATIONAL ISO
STANDARD 10983
Second edition
2014-04-15
Timber — Finger joints — Minimum
production requirements and testing
methods
Bois — Aboutages — Exigences minimales de production et méthodes
d’essais
Reference number
ISO 10983:2014(E)
ISO 2014
---------------------- Page: 1 ----------------------
ISO 10983:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 10983:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 2

5 Production requirements ............................................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Timber ............................................................................................................................................................................................................ 2

5.3 Adhesive ........................................................................................................................................................................................................ 3

5.4 Processing ................................................................................................................................................................................................... 3

5.5 Quality control ......................................................................................................................................................................................... 4

6 Testing requirements ...................................................................................................................................................................................... 5

6.1 General ........................................................................................................................................................................................................... 5

6.2 Materials ....................................................................................................................................................................................................... 5

6.3 Testing procedure ................................................................................................................................................................................. 5

6.4 Recording requirements ................................................................................................................................................................. 5

6.5 Qualification testing ........................................................................................................................................................................... 6

6.6 Compliance testing .............................................................................................................................................................................. 6

Annex A (normative) Finger-joint bending test ........................................................................................................................................ 8

Annex B (normative) Finger-joint tension test .......................................................................................................................................11

Annex C (informative) Proof-loading of finger joints in bending ........................................................................................13

Annex D (informative) Proof-loading of finger joints in tension ..........................................................................................15

© ISO 2014 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 10983:2014(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 165, Timber structures.

This second edition cancels and replaces the first edition (ISO 10983:1999), which has been technically

revised.
iv © ISO 2014 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 10983:2014(E)
Introduction

This International Standard sets out minimum production and testing requirements for structural

finger joints. It includes requirements for documentation of manufacturing and test procedures in a

quality manual to ensure ongoing consistent quality. TC 165 is not prepared to recommend the use of

finger joints in structural timber components where the manufacturing process is not described by a

production facility’s quality manual for the following reasons.

a) Structural properties can only be assigned to a finger joint that is clearly defined. Such a definition

requires a clear description, within the production facility’s quality manual, of the raw material

inputs (wood and adhesive), the manufacturing process, and quality assurance procedures.

b) Processes which are not written in a production facility’s quality manual and promulgated to the

personnel responsible for manufacturing the finger joint are unlikely, over lengthy periods of time,

to be manufactured consistently.

Other principles built into the development of this International Standard are as follows.

— This International Standard applies only to the finger-joint production and makes reference only

to the maintenance of finger-joint strength. Finger joints are found in both glulam laminations

and finger-jointed timber used directly for structural applications. No attempt is made in this

International Standard to relate compliance testing to the properties of either glulam or finger-

jointed timber.

— Qualification testing is undertaken to establish characteristic strengths and target strengths for

compliance (daily quality control) testing. The precise test configurations are not specified in this

International Standard, which permits the use of a wide variety of test equipment. However, it is a

requirement that the same equipment and configuration used for qualification testing also be used

for compliance testing. Both bending and tension tests are provided.
© ISO 2014 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 10983:2014(E)
Timber — Finger joints — Minimum production
requirements and testing methods
1 Scope

This International Standard specifies minimum requirements for the manufacture and testing of bonded

finger joints in structural wood products such as glued laminated timber, cross-laminated timber, and

finger-jointed timber.

Although most finger joints are produced in coniferous species (softwoods), this International Standard

also applies to broadleafed species (hardwoods) where information is available to enable them to be

satisfactorily bonded.

It does not cover impressed (die-formed) joints and, in the case of laminated timber products, it applies

only to individual laminations. Large finger joints in glued laminated timber are not covered by this

International Standard.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 20152-1, Timber structures — Bond performance of adhesives — Part 1: Basic requirements

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
finger joint

end joint formed by machining a number of similar, tapered, symmetrical fingers in the ends of timber

members which are then bonded together
3.2
production batch

group of finger joints, all of which have the same profile, are manufactured from the same species of

timber, have the same nominal cross section, are bonded with the same adhesive, and are made during

a continuous run on one production line
3.3
qualification testing

testing in bending or tension performed to establish the mean and lower 5 % tolerance limit strength

with 75 % confidence when the finger joint process is first established
3.4
compliance testing

testing in bending or tension to verify that ongoing production complies with the characteristic and

target strengths established during qualification testing
© ISO 2014 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 10983:2014(E)
4 Symbols
For the purposes of this International Standard, the following symbols apply.
a distance between support and nearest applied load in bending test (mm)
b smaller dimension of cross section (mm)
h larger dimension of cross section (mm)
f bending strength of a single finger joint
f tension strength of a single finger joint
l distance between supports in bending test
P maximum force applied to finger jointed specimen during bending test
T maximum force applied to finger jointed specimen during tension test
5 Production requirements
5.1 General

The cutting and the bonding operations of finger joints shall result in reliable and durable bonds of

the required strength. The premises shall meet the requirements of cleanliness, air temperature, and

relative humidity to ensure a satisfactory production environment. Procedures for the operation of the

production facility and for the initial and ongoing quality evaluation shall be documented in a quality

manual. All machinery and equipment necessary for the production process shall be available and in

good working order. Timber shall be properly graded. Adhesives shall be compatible with the species

and treatment in conformance with the adhesive manufacturer’s recommendations. Cutting, bonding,

and handling of finger-jointed timber shall be in conformance with the production facility’s quality

manual.
5.2 Timber
5.2.1 Species

Any wood species shall be permitted provided that sufficient information on the species is available

to enable the timber to be bonded satisfactorily. Different species with similar strength and bonding

characteristics shall be permitted to be grouped together for qualification and compliance testing.

5.2.2 Timber grading

Individual pieces of timber to be finger-jointed shall be graded according to the product requirements

as described in the production facility’s quality manual. Specific limits shall be defined for knots, grain

deviations, wane, and other characteristics determined to be detrimental to the performance of the

product. The maximum size and extent of knots and other strength-reducing characteristics at the ends

of the pieces to be finger-jointed shall be limited as defined in the quality manual to minimize their

effect on the strength of the joint.
5.2.3 Moisture content and temperature

During assembly and curing, the moisture content and temperature of the wood at the joint shall be

within the range specified by the adhesive manufacturer.

Moisture content shall be measured by the use of a regularly calibrated moisture meter.

2 © ISO 2014 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 10983:2014(E)
5.2.4 Chemically treated timber

Wood treated with chemicals such as those used to improve durability or fire performance shall be

considered as a separate species for the purposes of finger joint production and quality control.

5.3 Adhesive
5.3.1 General

The adhesive shall have sufficient strength and durability to ensure that the integrity of the bond will

be maintained throughout the intended lifetime of the structure. Compatibility of the adhesive, wood

substrate, and plant procedures shall be demonstrated through qualification tests prior to production.

The adhesive used shall meet the requirements of ISO 20152-1.
5.3.2 Adhesive manufacturer’s specifications

The specifications of the adhesive manufacturer shall be followed with respect to the following:

a) mixing of the adhesive;
b) use of fillers;
c) preheating of the timber (by high frequency, infrared, or other methods);
d) adhesive application;
e) open and closed assembly times;
f) curing of the adhesive;
g) temperature of the air and the timber before and during curing;
h) moisture content of the timber at the joint;

g) other parameters deemed necessary by the adhesive manufacturer to maintain a consistent bond

quality.
5.4 Processing
5.4.1 Application of adhesive

The method used for adhesive application shall ensure that all finger surfaces in the assembled joint are

covered with the adhesive.
5.4.2 Assembly

Joints shall be bonded as soon as possible, and not later than 24 h, after machining. Between machining

and assembly, care shall be taken to keep the cut surfaces of the fingers clean. The members shall not be

stored in conditions likely to lead to distortion.
5.4.3 End pressure

The application of end pressure shall be adequate to bring the mated joint surfaces into contact and

extrude excess adhesive, while maintaining proper tip gaps and joint alignment. End pressure shall

be maintained until the joint has cured adequately to enable the jointed timber to be moved without

weakening the joint. Curing of the adhesive shall be completed before further processing, unless it has

been demonstrated that the finger joints will have sufficient and reliable strength to allow immediate

processing.
© ISO 2014 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 10983:2014(E)
5.5 Quality control
5.5.1 General

The manufacturer shall establish and document requirements for lumber, adhesive, and processing with

corresponding quality control procedures.

Each step in the production process, including lumber grading, finger joint machining and fit, adhesive

application, joint assembly and handling, adhesive curing, and final finishing shall be assessed for each

production batch. Finger joint strength shall be established through initial qualification testing and

verified for each production batch through ongoing compliance testing.
5.5.2 Facilities, equipment, and personnel

All necessary facilities, equipment, and personnel shall be available to carry out the necessary inspections

and tests. The manufacturer shall control, calibrate, and maintain inspection, measuring, and test

equipment, to demonstrate the conformity of the finger joints to the requirements of this International

Standard. Equipment shall be used in a manner which ensures that measurement tolerances are known

and are consistent with the required measurement capability.
5.5.3 Responsibility and authority

The responsibility, authority, and interrelation of all personnel who manage, perform, and verify work

affecting quality shall be defined. Persons responsible to initiate action to prevent the occurrence of

non-conformity of finger joints and to identify and record any quality problems with finger joints shall

be clearly identified.
5.5.4 Factory production control

At every production facility, the manufacturer shall appoint a person or persons who shall have

appropriate authority, knowledge, and experience of the production of finger joints to be responsible for

conducting and supervising factory production and quality control procedures and ensuring that the

requirements given in this International Standard are implemented and maintained.

5.5.5 Review

The quality control system adopted to satisfy the requirements of this International Standard shall be

reviewed at appropriate intervals by the manufacturer’s management to ensure its continuing suitability

and effectiveness.
Records of such reviews shall be maintained.
5.5.6 Quality manual

The manufacturer shall document all procedures relevant to the production and quality control of finger

joints in a quality manual. At a minimum, the quality manual shall describe

a) the organizational structure, including responsibilities and powers of the management with regard

to conformity of the finger joints,

b) all procedures for specifying and verifying the quality of the timber and the adhesive,

c) each step in the production process, and

d) all inspections and tests that will be carried out before, during, and after manufacture, and the

frequency with which they are to be carried out.

The quality manual shall be available to production and quality personnel as needed to ensure consistent

application of production and quality control procedures.
4 © ISO 2014 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 10983:2014(E)
6 Testing requirements
6.1 General

Finger joint strength shall be established through qualification testing and verified for each production

batch through ongoing compliance testing. Specimens are permitted to be tested in either bending or

tension as chosen by the manufacturer or as required by an accreditation agency; however, the same

configuration used for qualification testing shall also be used for compliance testing.

6.2 Materials
Finger joints with differences in processing, treatment, timber species (or sp
...

DRAFT INTERNATIONAL STANDARD ISO/DIS 10983
ISO/TC 165 Secretariat: SCC
Voting begins on Voting terminates on
2013-01-28 2013-04-28

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

Timber — Finger joints — Minimum production requirements
and testing methods
Bois — Aboutages — Exigences minimales de production et méthodes d'essais
[Revision of first edition (ISO 10983:1999)]
ICS 91.080.20

To expedite distribution, this document is circulated as received from the committee

secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at

publication stage.

Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du

secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au

Secrétariat central de l'ISO au stade de publication.

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE

REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.

IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT

INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO

WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.

RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH

THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2013
---------------------- Page: 1 ----------------------
ISO/DIS 10983
Copyright notice

This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted

under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be

reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,

photocopying, recording or otherwise, without prior written permission being secured.

Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s

member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2013 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 10983
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

ISO 10983 was prepared by Technical Committee ISO/TC 165, Timber Structures.

This second edition cancels and replaces the first edition (ISO 10983:1999), which has been technically

revised.
© ISO 2002 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 10983
Introduction

This International Standard sets out minimum production and testing requirements for structural finger joints. It

includes requirements for documentation of manufacturing and test procedures in a quality manual to ensure

ongoing consistent quality. TC 165 is not prepared to recommend the use of finger joints in structural timber

components where the manufacturing process is not described by a production facility’s quality manual for the

following reasons:

a) Structural properties can only be assigned to a finger joint that is clearly defined. Such definition requires a

clear description, within the production facility’s quality manual, of the raw material inputs (wood and

adhesive), the manufacturing process, and quality assurance procedures.

b) Processes which are not written in a production facility’s quality manual and promulgated to the personnel

responsible for manufacturing the finger joint are unlikely, over lengthy periods of time, to be

manufactured consistently.

Other principles built into the development of this International Standard are as follows.

⎯ This International Standard applies only to the finger-joint production and makes reference only to the

maintenance of finger-joint strength. Finger joints are found in both glulam laminations and finger-jointed

timber used directly for structural applications. No attempt is made in this International Standard to relate

compliance testing to the properties of either glulam or finger-jointed timber.

⎯ Qualification testing is undertaken to establish characteristic strengths and target strengths for compliance

(daily quality control) testing. The precise test configurations are not specified in this International

Standard, which permits the use of a wide variety of test equipment. However, it is a requirement that the

same equipment and configuration used for qualification testing also be used for compliance testing. Both

bending and tension tests are provided.
iv © ISO 2002 – All rights reserved
---------------------- Page: 4 ----------------------
Proposed DRAFT INTERNATIONAL STANDARD ISO/DIS 10983
Timber Structures — Finger joints for structural timber —
Production and testing requirements
1 Scope

This International Standard specifies minimum requirements for the manufacture and testing of bonded finger

joints in structural wood products such as glued laminated timber, cross laminated timber, and finger jointed

timber.

Although most finger joints are produced in coniferous species (softwoods), this International Standard also

applies to broadleafed species (hardwoods) where information is available to enable them to be satisfactorily

bonded.

It does not cover impressed (die-formed) joints. In the case of glued laminated timber, it applies only to

individual laminations. Large finger joints in glued laminated timber are not covered by this International

Standard.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO20152-1, Timber structures – Bond performance of adhesives –Basic requirements

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
finger joint

end joint formed by machining a number of similar, tapered, symmetrical fingers in the ends of timber

members which are then bonded together
3.2
production batch

a group of finger joints, all of which have the same profile, are manufactured from the same species of timber,

have the same nominal cross-section, are bonded with the same adhesive, and are made during a continuous

run on one production line
3.3
qualification testing

testing in bending or tension performed to establish the mean and lower 5% tolerance limit strength with 75%

confidence when the finger joint process is first established.
© ISO 2002 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO/DIS 10983
4 Symbols (and abbreviated terms)

a distance between support and nearest applied load in bending test, in millimetres

b smaller dimension of cross-section
h larger dimension of cross-section
f bending strength of a single finger joint
f tension strength of a single finger joint
l distance between supports in bending test
P maximum force applied to finger jointed specimen during bending test
T maximum force applied to finger jointed specimen during tension test
5 Production Requirements
5.1 General

The cutting and the bonding operations of finger joints shall result in reliable and durable bonds of the required

strength. The premises shall meet the requirements of cleanliness, air temperature, and relative humidity to

ensure a satisfactory production environment. Procedures for the operation of the production facility and for

the initial and ongoing quality evaluation shall be documented in a quality manual. All machinery and

equipment necessary for the production process shall be available and in good working order. Timber shall

be properly graded. Adhesives shall be compatible with the species and treatment in conformance with the

adhesive manufacturer’s recommendations. Cutting, bonding, and handling of finger jointed timber shall be in

conformance with the production facility’s quality manual.
5.2 Timber
5.2.1 Species

Any wood species shall be permitted provided that sufficient information on the species is available to enable

the timber to be bonded satisfactorily. Different species with similar strength and bonding characteristics shall

be permitted to be grouped together for qualification and compliance testing.
5.2.2 Timber Grading

Individual pieces of timber to be finger-jointed shall be graded according to the product requirements as

described in the production facility’s quality manual. Specific limits shall be defined for knots, grain deviations,

wane, and other characteristics determined to be detrimental to the performance of the product. The

maximum size and extent of knots and other strength reducing characteristics at the ends of the pieces to be

finger-jointed shall be limited as defined in the quality manual to minimize their effect on the strength of the

joint.
5.2.3 Moisture content and temperature

During assembly and curing, the moisture content and temperature of the wood at the joint shall be within the

range specified by the adhesive manufacturer.

Moisture content shall be measured by the use of a regularly calibrated moisture meter.

2 © ISO 2002 – All rights reserved
---------------------- Page: 6 ----------------------
ISO/DIS 10983
5.2.4 Chemically treated timber

Wood treated with chemicals such as those used to improve durability or fire performance shall be considered

as a separate species for the purposes of finger joint production and quality control.

5.3 Adhesive
5.3.1 General

The adhesive shall have sufficient strength and durability to ensure that that the integrity of the bond will be

maintained throughout the intended lifetime of the structure. Compatibility of the adhesive, wood substrate,

and plant procedures shall be demonstrated through qualification tests prior to production. The adhesive used

shall meet the requirements of ISO20152-1.
5.3.2 Adhesive Manufacturer’s Specifications

The specifications of the adhesive manufacturer shall be followed with respect to the following:

a) mixing of the adhesive;
b) use of fillers;
c) preheating of the timber (by high frequency, infrared or other methods);
d) adhesive application;
e) open and closed assembly times;
f) curing of the adhesive;
g) temperature of the air and the timber before and during curing.
h) moisture content of the timber at the joint
5.4 Processing
5.4.1 Application of Adhesive

The method used for adhesive application shall ensure that all finger surfaces in the assembled joint are

covered with the adhesive.
5.4.2 Assembly

Joints shall be bonded as soon as possible, and not later than 24 h, after machining. Between machining and

assembly, care shall be taken to keep the cut surfaces of the fingers clean. The members shall not be stored

in conditions likely to lead to distortion.
5.4.3 End pressure

The application of end pressure shall be adequate to bring the mated joint surfaces into contact, while

maintaining proper tip gaps and joint alignment. End pressure shall be maintained until the joint has cured

adequately to enable the jointed timber to be moved without weakening the joint. Curing of the adhesive shall

be completed before further processing, unless it has been demonstrated that the finger joints will have

sufficient and reliable strength to allow immediate processing.
© ISO 2002 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO/DIS 10983
5.5 Quality Control
5.5.1 General

The manufacturer shall establish and document requirements for lumber, adhesive, and processing with

corresponding quality control procedures.

Each step in the production process, including lumber grading, finger joint machining and fit, adhesive

application, joint assembly and handling, adhesive curing, and final finishing shall be assessed for each

production batch. Finger joint strength shall be established through initial qualification testing and verified for

each production batch through ongoing compliance testing.
5.5.2 Facilities, equipment, and personnel

All necessary facilities, equipment, and personnel shall be available to carry out the necessary inspections

and tests. The manufacturer shall control, calibrate and maintain inspection, measuring, and test equipment,

to demonstrate the conformity of the finger joints to the requirements of this International Standard. Equipment

shall be used in a manner which ensures that measurement tolerances are known and are consistent with the

required measurement capability.
5.5.3 Responsibility and authority

The responsibility, authority, and interrelation of all personnel who manage, perform, and verify work affecting

quality shall be defined. Persons responsible to initiate action to prevent the occurrence of non-conformity of

finger joints and to identify and record any quality problems with finger joints shall be clearly identified.

5.5.4 Factory production control

At every production facility, the manufacturer shall appoint a person or persons who shall have appropriate

authority, knowledge, and experience of the production of finger joints to be responsible for conducting and

supervising factory production and quality control procedures and ensuring that the requirements given in this

International Standard are implemented and maintained.
5.5.5 Review

The quality control system adopted to satisfy the requirements of this International Standard shall be reviewed

at appropriate intervals by the manufacturer's management to ensure its continuing suitability and

effectiveness.
Records of such reviews shall be maintained.
5.5.6 Quality Manual

The manufacturer shall document all procedures relevant to the production and quality control of finger joints

in a quality manual. At a minimum, the quality manual shall describe:

a) the organizational structure, including responsibilities and powers of the management with regard to

conformity of the finger joints;

b) all procedures for specifying and verifying the quality of the timber and the adhesive;

c) each step in the production process;

d) all inspections and tests that will be carried out before, during, and after manufacture, and the frequency

with which they are to be carried out.

The quality manual shall be available to production and quality personnel as needed to ensure consistent

application of production and quality control procedures.
4 © ISO 2002 – All rights reserved
---------------------- Page: 8 ----------------------
ISO/DIS 10983
6 Testing Requirements
6.1 General

Finger joint strength shall be established through initial qualification testing and verified for each production

batch through ongoing compliance testing. Specimens are permitted to be tested in either bending or tension

as chosen by the manufacturer or as required by an accreditation agency; however, the same configuration

used for qualification testing shall also be used for compliance testing.
6.2 Materials

Finger joints with differences in processing, treatment, timber species (or species group), joint geometry, or

adhesive shall be evaluated separately. Sample joints shall be selected from and represent normal

production. The timber densities shall be representative of the species and grade concerned. At the time the

sample joints are manufactured, the timber shall be at the moisture content at which production joints would

normally be made. The surface finish of the specimens at the time of testing shall be typical of the jointed

timber normally supplied by the manufacturer.

Specimens for qualification testing shall be tested in the fully-cured condition. Specimens for compliance

testing are permitted to be tested in the fully-cured condition or in a partially-cured condition, provided that a

consistent relationship has been established between fully-cured strength and partially-cured strength. Where

partially-cured specimens are tested for compliance, the time between bonding of the joint and testing shall be

consistent to ensure that a similar degree of cure is achieved for each specimen. The relationship between

partially-cured end joint strengths and fully-cured end joint strengths shall be reevaluated periodically at

intervals of one month or less.
6.3 Testing procedure

Testing shall be conducted in accordance with Annex A for bending tests or Annex B for tension tests. Each

specimen shall contain a finger joint at mid-length. Where possible, the whole jointed cross-section shall be

tested. However, test specimens not covering the full cross-section of the jointed timber may be used provided

that two specimens, each making up at least one-third of the cross-section, are tested. In bending tests, these

specimens shall include the edges of the original cross-section and these edges shall be on the tension side

of the specimen in the bending test. Only the low
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