SIST EN 1309-3:2018

Round and sawn timber - Methods of measurements - Part 3: Features and biological degradations

This European Standard specifies the methodology for measurement of features - in relation to wood structure, biological agencies and other damage - taken into account in the visual grading:
a)   for appearance - of sawn, processed and round timber;
b)   for serviceability - of sawn and processed timber (identified in EN 1611-1 as the integrity of the timber).
When the standard is applied the methodology of measurement used shall be stated.
It is not applicable to structural timber for which strength grading in accordance with EN 14081-1 is required.
This standard applies to hardwood and softwood sawn timber, both square edged and un-edged, to processed timber and to round timber.
It does not apply to tropical timber.

Rund- und Schnittholz - Verfahren zur Messung - Teil 3: Merkmale und Schädlingsbefall

Diese Europäische Norm legt das Verfahren zur Messung von Merkmalen in Bezug auf Holzkonstruktionen, biologischen Stoffe und anderen Schäden bei der visuellen Sortierung nach Folgendem fest:
a)   nach dem Aussehen von Schnittholz, weiterbearbeitetem Holz und Rundholz;
b)   nach der Brauchbarkeit von Schnittholz und weiterbearbeitetem Holz (bezeichnet in EN 1611-1 als Integrität des Holz).
Wird die Norm angewandt, muss die genutzte Vorgehensweise der Messung angegeben werden.
Sie gilt nicht für die Sortierung von Bauholz nach der Festigkeit, die nach EN 14081-1 gefordert ist.
Diese Norm bezieht sich auf parallel besäumtes und unbesäumtes Schnittholz sowie auf bearbeitetes Holz und Rundholz von Laub- und Nadelholzarten.
Auf Tropenholz ist diese Norm nicht anzuwenden.

Bois ronds et bois sciés - Méthode de mesure - Partie 3: Singularités et altérations biologiques

La présente Norme européenne spécifie la méthodologie de mesure des singularités (relatives à la structure du bois, aux altérations biologiques et aux autres dégradations) prises en compte pour le classement visuel :
a)   de l’aspect des bois sciés, usinés et ronds ;
b)   de l’aptitude à l’emploi des bois sciés et usinés (identifiée dans l’EN 1611-1 sous la dénomination « intégrité du bois »).
Lorsque la norme s’applique, la méthodologie de mesure utilisée doit être spécifiée.
Elle ne s’applique pas aux bois de structure pour lesquels un classement de résistance conforme à l’EN 14081-1 est requis.
La présente norme s’applique aux bois feuillus et résineux, sciés, avivés ou non, aux bois usinés et aux bois ronds.
Elle ne s’applique pas aux bois tropicaux.

Okrogli in žagani les - Metode merjenja - 3. del: Značilnosti in biološka razgradnja

Ta evropski standard določa metodologijo za merjenje funkcij – v povezavi s strukturo lesa, biološkimi agencijami in drugo škodo – ki se upoštevajo pri vizualnem ocenjevanju:
a) videza – žaganega, obdelanega in okroglega lesa;
b) uporabnosti – žaganega in obdelanega lesa (v standardu EN 1611-1 je to navedeno kot celovitost lesa).
Kadar je standard uporabljen, je treba navesti metodologijo uporabljenega merjenja.
Standard se ne uporablja pri konstrukcijskem lesu, pri katerem je zahtevano razvrščanje po trdnosti v skladu s standardom EN 14081-1.
Ta standard se uporablja pri žaganem lesu listavcev in iglavcev, tako z oblikovanim robom kot brez njega, obdelanem lesu in okroglem lesu. Ne uporablja se za tropski les.

General Information

• Status: Published
• Public Enquiry End Date: 19-Sep-2016
• Publication Date: 12-Feb-2018
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: LLZ - Les, lesni izdelki in zaščita lesa
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 02-Feb-2018
• Due Date: 09-Apr-2018
• Completion Date: 13-Feb-2018
• Ref Project: EN 1309-3:2018 - Round and sawn timber - Methods of measurements - Part 3: Features and biological degradations

Relations

• Replaces: SIST EN 1310:2001 - Round and sawn timber - Method of measurement of features
• Effective Date: 01-Mar-2018
• Replaces: SIST EN 1311:2001 - Round and sawn timber - Method of measurement of biological degrade
• Effective Date: 01-Mar-2018

Overview

EN 1309-3:2018 - "Round and sawn timber - Methods of measurements - Part 3: Features and biological degradations" is a CEN European standard that defines a consistent methodology for measuring visual features and biological damage in timber. It applies to hardwood and softwood sawn timber (square-edged and un-edged), processed timber and round timber, and is used to support visual grading for both appearance and serviceability (integrity, as identified in EN 1611-1). The standard is not applicable to structural timber requiring strength grading under EN 14081-1 and does not apply to tropical timber. EN 1309-3:2018 supersedes earlier EN 1310/1311 documents and was approved by CEN in 2017.

Key topics

The standard specifies measurement methodology for a comprehensive range of timber features and biological degradations. Major topics include:

• Wood structure features
  • Knots (including detailed measurement methods and Annex A alternative method for serviceability)
  • Grain characteristics (slope, spiral, interlocked, curly)
  • Reaction/compression wood, rate of growth, burls, buckles
  • Sapwood, included sapwood, false heartwood
• Dimensional and form features
  • Wane, sweep, taper, ovality (round timber)
  • Warp: bow, spring, cup, twist
• Fissures and cracks
  • Face/edge/end shakes, ring and heart shakes, checks, frost/lighting shakes, felling shakes
• Biological degradation
  • Insect attack, fungal attack, hollowing and decay, other biological agents
• Other defects
  • Bark pockets, resin pockets, parasitic plants, carbonization, cankers, bird peck, foreign bodies, tapping cuts

The standard requires the user to state the measurement methodology used when applying EN 1309-3, ensuring clarity and repeatability in procurement and inspection.

Applications

EN 1309-3:2018 is intended for practical use where consistent visual assessment and measurement of timber features and decay are needed:

• Sawmills and timber processors for grading, sorting and quality control
• Timber inspectors and certification bodies for conformity assessment
• Timber traders and procurement teams to define acceptance criteria in contracts
• Architects, specifiers, and manufacturers who require uniform appearance or serviceability specifications
• Research labs and standards bodies for comparative studies and harmonized reporting

Using EN 1309-3 improves consistency in visual grading, reduces disputes in commercial transactions, and supports quality assurance across the timber supply chain.

Related standards

• EN 1309-1 - Measurement of dimensions (sawn timber)
• EN 1309-2 - Measurement of dimensions (round timber)
• EN 1611-1 - Serviceability / integrity references
• EN 14081-1 - Structural timber strength grading (timber requiring strength grading is excluded from EN 1309-3)

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2018
1DGRPHãþD
SIST EN 1310:2001
SIST EN 1311:2001
2NURJOLLQåDJDQLOHV0HWRGHPHUMHQMDGHO=QDþLOQRVWLLQELRORãNDUD]JUDGQMD
Round and sawn timber - Methods of measurements - Part 3: Features and biological
degradations
Rund- und Schnittholz - Verfahren zur Messung - Teil 3: Merkmale und Schädlingsbefall
Bois ronds et bois sciés - Méthode de mesure - Partie 3: Singularités et altérations
biologiques
Ta slovenski standard je istoveten z: EN 1309-3:2018
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1309-3
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2018
EUROPÄISCHE NORM
ICS 79.040 Supersedes EN 1310:1997, EN 1311:1997
English Version
Round and sawn timber - Methods of measurements - Part
3: Features and biological degradations
Bois ronds et bois sciés - Méthode de mesure - Partie 3 Rund- und Schnittholz - Messmethoden - Teil 3:
: Singularités et altérations biologiques Merkmale und biologische Schädigungen
This European Standard was approved by CEN on 29 October 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1309-3:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 5
5 Sawn and processed timber . 6
5.1 Knots . 6
5.1.1 General . 6
5.1.2 Appearance assessment methodology . 6
5.2 Resin pocket . 10
5.3 Reaction wood . 10
5.4 Grain . 10
5.4.1 Slope of grain . 10
5.4.2 Spiral, interlocked grain . 11
5.4.3 Curly grain . 11
5.5 Rate of growth . 12
5.6 Bark pocket . 13
5.7 Sapwood . 13
5.8 Wane . 13
5.9 Fissure . 14
5.9.1 Face, edge and end shakes, splits . 14
5.9.2 Ring and heart shakes . 14
5.9.3 Checks . 14
5.10 Warp . 15
5.10.1 Bow and spring . 15
5.10.2 Cup . 15
5.10.3 Twist . 16
6 Round timber . 16
6.1 Features of the form of the log . 16
6.1.1 Sweep . 16
6.1.2 Taper . 17
6.1.3 Ovality . 17
6.1.4 Rate of growth . 18
6.2 Features of the structure of the wood . 19
6.2.1 Eccentric pith. . 19
6.2.2 Burl . 19
6.2.3 Buckles . 19
6.2.4 Spiral grain . 20
6.2.5 Compression wood (reaction wood in softwood) . 20
6.2.6 Double pith . 20
6.3 Sapwood . 20
6.4 Included sapwood . 21
6.5 False heartwood . 21
6.6 Knots . 21
6.6.1 Uncovered knot . 21
6.6.2 Covered knot . 22
6.6.3 Epicormic shoot . 22
6.6.4 Rose . 22
6.7 Cracks . 22
6.7.1 Heart shake . 22
6.7.2 Star shake . 22
6.7.3 Ring shake . 22
6.7.4 Check, traversing crack . 23
6.7.5 Frost crack, lightning shake . 23
6.7.6 Felling shake . 23
6.8 Biological degradation . 23
6.8.1 Attack by insects . 23
6.8.2 Fungal attack . 24
6.8.3 Hollow . 24
6.8.4 Other attack . 24
6.9 Other defects . 24
6.9.1 Dry side . 24
6.9.2 Parasitic plant . 24
6.9.3 Carbonized wood . 25
6.9.4 Canker . 25
6.9.5 Bird peck . 25
6.10 Tapping cut . 25
6.11 Foreign bodies . 25
6.12 Resin pocket . 25
6.13 Other damage . 26
7 Biological degrade . 26
7.1 Sawn timber . 26
7.1.1 Degrade by insects . 26
7.1.2 Fungal degrade . 26
7.2 Round timber . 26
7.2.1 Degrade by insects . 26
7.2.2 Fungal degrade . 27
7.2.3 Hollow . 27
7.2.4 Other degrade . 27
Annex A (normative) Alternative methodology for measurement of knots for assessment of
serviceability . 28
A.1 General . 28
A.2 Round knot . 28
A.3 Oval knot . 28
A.4 Arris knot . 29
A.5 Spike knot . 29
A.6 Splay knot . 29
A.7 Branched knot . 30
A.8 Knot cluster . 30

European foreword
This document (EN 1309-3:2018) has been prepared by Technical Committee CEN/TC 175 “Round and
sawn timber”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by July 2018, and conflicting national standards shall be
withdrawn at the latest by July 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1310:1997 and EN 1311:1997.
This standard is one of a series, and covers methods of measurement for round timber and sawn timber.
Other standards in this series are:
— EN 1309-1 Round and sawn timber - Method of measurement of dimensions – Part 1: Sawn timber
— EN 1309-2 Round and sawn timber - Method of measurement of dimensions – Part 2: Round timber
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
the United Kingdom.
1 Scope
This European Standard specifies the methodology for measurement of features – in relation to wood
structure, biological agencies and other damage – taken into account in the visual grading:
a) for appearance – of sawn, processed and round timber;
b) for serviceability – of sawn and processed timber (identified in EN 1611-1 as the integrity of the
timber).
When the standard is applied the methodology of measurement used shall be stated.
It is not applicable to structural timber for which strength grading in accordance with EN 14081-1 is
required.
This standard applies to hardwood and softwood sawn timber, both square edged and un-edged, to
processed timber and to round timber.
It does not apply to tropical timber.
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.
EN 844 (all parts), Round and sawn timber - Terminology
EN 1611-1, Sawn timber - Appearance grading of softwoods - Part 1: European spruces, firs, pines and
Douglas firs
EN 14081-1, Timber structures - Strength graded structural timber with rectangular cross section - Part 1:
General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 844 apply.
4 Symbols
d size, in millimetres;
a width on the minor axis, in millimetres;
b width on the major axis, in millimetres;
n maximum permitted number of knots;
max
d, d , sizes of the individual knots, in millimetres;
1 2
...d
n
d maximum permitted size of a knot, in millimetres.
max
5 Sawn and processed timber
5.1 Knots
5.1.1 General
For the purposes of this standard, knots in sawn timber are classified according to their shape, size and
position. Size is derived from the formulae given below and expressed in millimetres or as a percentage
of a dimension of the surface where the knot occurs. The following symbols are used in the formulae, with
suffixes as required:
d is the size, in millimetres;
a is the width on the minor axis, in millimetres;
b is the width on the major axis, in millimetres.
Methodology for measurement of knots for the assessment of appearance is set out in 5.1.2. For
assessment of serviceability, an alternative methodology for measurement of knots is given in Annex A.
NOTE For strength grading of structural timber, refer to EN 14081-1.
5.1.2 Appearance assessment methodology
5.1.2.1 General
Consider each knot individually, except for ‘cat’s paw’.
Measure knots on a part or all the surface of the face(s) or the edge(s) as specified by the grading rule
used. In the case of a knot with bark on its perimeter, the measurement of the knot shall include the bark.
Figures 1 to 6 show the categories of knots that shall be measured. Each figure is accompanied by the
corresponding formula that is generally the arithmetic average of the minor axis (a) and major axis (b) of
the knot (d = (a + b)/2). Measure the width on each axis and derive the size from the formula.
For each grade, the maximum size and number of knots per piece or per unit measure is stated in the
grading standards / grading rules.
A larger number of smaller knots may be permitted provided their cumulative measure does not exceed
the maximum knot size multiplied by the number permitted within a grade, which can be expressed as:
n
dn≤× d (1)
max max
∑
where
n is the maximum permitted number of knots;
max
d , d , .d are the sizes of the individual knots, in millimetres;
1 2 n
d is the maximum permitted size of a knot, in millimetres.
max
Where a grading standard permits the use of such cumulative measurement it will be stated in the grading
standard.
5.1.2.2 Round knot
Figure 1 — Round knot
Formula:
ab+
d= (2)
5.1.2.3 Oval knot
Figure 2 — Oval knot
Formula:
ab+
d= (3)
5.1.2.4 Arris knot
Knot A Knot B
Key
1 On faces
2 On edges (Knot B: not measured, record its presence)
Figure 3 — Arris knot
Formula:
on face (Knot A and Knot B):
(4)
da=
on edge (Knot A):
da= (5)
5.1.2.5 Spike knot (Oval knot with maximum to minimum ratio exceeding 4)
Depending on the grading rule used,
a) measure as oval knot, or
b) not measured, record its presence.
Figure 4 — Spike knot
5.1.2.6 Splay knot
Figure 5 — Spl
...