Structural timber - Sizes, permitted deviations

This European Standard specifies two classes of permitted deviations from target sizes for structural timber of softwood and hardwood species.
It also specifies the moisture content to be used as a reference point for the measurement of sizes, and gives average values for changes in size due to changes in moisture content.
It is applicable to sawn and prepared square-edged structural timber with parallel edges having sawn thicknesses or widths greater than 6 mm.

Bauholz für tragende Zwecke - Maße, zulässige Abweichungen

Diese Norm legt zwei Klassen zulässiger Abweichungen von den Sollmaßen für Bauholz für tragende Zwecke aus Nadel  und Laubhölzern fest.
Die Norm legt auch die Holzfeuchte fest, die als Bezugspunkt für die Ermittlung der Maße dient, und es werden Mittelwerte für die Maßänderungen bei Änderungen der Holzfeuchte angegeben.
Sie gilt für Bauschnittholz für tragende Zwecke mit Rechteckquerschnitt und parallelen Kanten mit Dicken oder Breiten von mehr als 6 mm.

Bois de structure - Dimensions, écarts admissibles

La présente norme européenne spécifie deux classes d'écarts admissibles par rapport à des dimensions cibles pour les bois de structure en essences résineuses et feuillues.
Elle définit également la teneur en humidité à utiliser comme référence pour la mesure des dimensions et donne les valeurs moyennes des variations dimensionnelles dues aux variations de teneur en humidité.
Elle s’applique aux bois de structure avivés sciés et ébauchés ayant des rives parallèles et des épaisseurs ou largeurs supérieures à 6 mm.

Konstrukcijski les - Mere, dovoljena odstopanja

Ta evropski standard določa dva razreda dovoljenih odstopanj od ciljnih mer za konstrukcijski les mehkih in trdih vrst. Določa tudi vsebnost vlage, ki se uporablja kot referenčna točka za merjenje mer, ter navaja povprečne vrednosti za spremembe mer zaradi sprememb vsebnosti vlage. Uporablja se za žagan in pripravljen konstrukcijski les s kvadratnim robom z vzporednimi robovi z žaganimi debelinami ali širinami nad 6 mm.

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Standards Content (Sample)

SIST EN 336:2004
Konstrukcijski les - Mere, dovoljena odstopanja
Structural timber - Sizes, permitted deviations
Bauholz für tragende Zwecke - Maße, zulässige Abweichungen
Bois de structure - Dimensions, écarts admissibles
Ta slovenski standard je istoveten z: EN 336:2013
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 336
October 2013
ICS 79.040 Supersedes EN 336:2003
English Version
Structural timber - Sizes, permitted deviations
Bois de structure - Dimensions, écarts admissibles Bauholz für tragende Zwecke - Maße, zulässige
This European Standard was approved by CEN on 24 August 2013.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United


Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 336:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Sizes for structural timber .5
4.1 General .5
4.2 Changes in size due to changes in moisture content .6
4.3 Permitted cross-sectional deviations .6
4.4 Permitted length deviations .6
5 Moisture content measurement .6

This document (EN 336:2013) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, 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 April 2014, and conflicting national standards shall be withdrawn at the latest by
April 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document will supersede EN 336:2003.
Compared to EN 336:2003, the following modifications have been made:
a) in the scope, the limit to 300 mm is deleted so the standard is available for large cross section;
b) minimum size changed from 22 mm to 6 mm;
c) in subclause 4.2, the changes in size due to changes in moisture content are given for hardwoods;
d) in subclause 4

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