EN 15146:2026

Solid softwood panelling and cladding - Machined profiles without tongue and groove

This document specifies characteristics of solid wood panelling and cladding without tongue and groove machined from softwoods (wood of trees of the botanical group gymnosperms). Products are intended for interior or exterior use.
This document covers treated, untreated and surface treated products, including those made of thermally and chemically modified wood, as well as finger jointed products.
This document does not cover processes for treatment, surface coating or modification.
NOTE   Where further regulatory provisions (e.g. durability, reaction to fire, dangerous substances and generally CE-marking according to CPR) are required, EN 14915 applies.

Innen- und Außenbekleidungen aus massivem Nadelholz - Profilholz ohne Nut und Feder

Dieses Dokument legt Eigenschaften von Innen- und Außenbekleidungen aus Massivholz ohne Nut und Feder fest, die aus Nadelhölzern (Holz von Bäumen der botanischen Gruppe der Gymnospermae) mittels maschineller Bearbeitung hergestellt wurden. Die Produkte sind für die Verwendung im Innen  oder Außenbereich vorgesehen.
In diesem Dokument geht es um behandelte, unbehandelte und oberflächenbehandelte Produkte, einschließlich solcher aus thermisch und chemisch modifiziertem Holz, sowie Produkte mit Keilzinkung.
Verfahren zur Behandlung, Oberflächenbeschichtung oder Modifizierung sind nicht Gegenstand dieses Dokuments.
ANMERKUNG   Wo weitergehende regulatorische Vorgaben (z. B. Dauerhaftigkeit, Brandverhalten, gefährliche Stoffe und allgemeine CE Kennzeichnung nach EU-BauPVO) erforderlich sind, greift die harmonisierte Norm EN 14915.

Lambris et bardages en bois massif résineux - Profilés usinés sans rainure et languette

Le présent document définit les caractéristiques des lambris et bardages en bois massif sans rainure et languette usinés à partir de bois résineux (bois d'arbres du groupe botanique des gymnospermes). Les produits sont destinés à une utilisation en intérieur ou en extérieur.
Le présent document couvre les produits traités, non traités et ayant reçu un traitement de surface, y compris ceux en bois modifié thermiquement et chimiquement, ainsi que les produits aboutés.
Le présent document ne couvre pas les procédés de traitement, de finition de surface ou de modification.
NOTE   Lorsque d'autres dispositions réglementaires (par exemple, durabilité, réaction au feu, substances dangereuses et généralement le marquage CE conformément au RPC) sont requises, l'EN 14915 s'applique.

Notranje in zunanje obloge iz masivnega lesa - Profili brez utora in peresa

General Information

• Status: Not Published
• Publication Date: 30-Jun-2026
• ICS: 79.080 - Semi-manufactures of timber
• Technical Committee: CEN/TC 175 - Round and sawn timber
• Drafting Committee: CEN/TC 175/WG 38 - Specific user requirements - Timber in cladding and panelling
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 30-Apr-2026
• Due Date: 10-Aug-2026
• Completion Date: 30-Apr-2026
• Directive: Harmonized Standard305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/121 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on internal and external wall and ceiling finishes
• Ref Project: kSIST FprEN 15146:2026 - Solid softwood panelling and cladding - Machined profiles without tongue and groove

Relations

• Revises: EN 15146:2006 - Solid softwood panelling and cladding - Machined profiles without tongue and groove
• Effective Date: 30-Jun-2021

Overview

EN 15146:2026 is a European standard developed by CEN specifying the characteristics of solid softwood panelling and cladding with machined profiles that do not include tongue and groove. This standard applies to panels and cladding elements manufactured from softwoods-gymnosperms-that are intended for both interior and exterior applications. The document covers a variety of product types, including those that are untreated, surface treated, treated, thermally or chemically modified, and finger-jointed. EN 15146:2026 does not address treatment or surface coating processes themselves; instead, it focuses on product attributes and classification at the time of production. For additional regulatory requirements such as durability, fire reaction, dangerous substances, and CE-marking under the Construction Products Regulation (CPR), reference to EN 14915 is required.

Key Topics

• Product Scope: Solid wood panelling and cladding made from softwoods, without tongue and groove profiles, intended for use in a range of environments.
• Grading Classes: Specification of grading systems for softwoods, including special consideration for species such as maritime pine. Classes include Grade A, Grade B, and trade-specific designations.
• Moisture Content: Defines acceptable moisture content ranges at the time of production, crucial for product stability and performance.
• Dimensional Tolerances: Establishes minimum thickness, width, and length, as well as tolerances for geometrical characteristics to ensure consistency and fit.
• Surface Machining: Requirements for surface finish, whether planed, rough sawn, brushed, sandblasted, or sanded.
• Marking and Technical Specifications: Outlines the mandatory information to be provided on products, packaging, or accompanying documentation.

Applications

EN 15146:2026 provides practical value for multiple stakeholders in the timber industry:

• Manufacturers benefit from clear, harmonized requirements for product characteristics, facilitating quality assurance and streamlined production processes. The standard supports the production of both traditional and modified softwood cladding and panelling for a wide variety of end uses.
• Architects and Designers have reliable criteria for specifying solid wood panelling and cladding solutions for interior wall finishes, exterior facades, and decorative features, ensuring standardized dimensional stability, visual appearance, and suitability for the intended application.
• Builders and Contractors can ensure compliance, quality, and proper installation by referencing the prescribed grading, moisture content, and surface machining specifications. The absence of tongue and groove profiles offers flexible installation possibilities for various architectural concepts.
• Suppliers and Distributors are supported with clear product information and marking requirements, promoting transparency and traceability across international supply chains.
• Specifiers and Regulators can refer to EN 15146:2026 for defining procurement requirements for softwood panelling and cladding in both renovation and new construction projects.

Related Standards

For comprehensive conformity and to address additional requirements such as durability, fire performance, and hazardous substances, professionals should consult these related standards:

• EN 14915: Solid wood panelling and cladding - Characteristics, requirements, and marking (especially relevant for regulatory compliance and CE-marking).
• EN 1309-1, EN 1309-3: Methods for measuring dimensions and assessing biological degradations in round and sawn timber.
• EN 13183-1, EN 13183-2, EN 13183-3: Determination of moisture content by oven dry, electrical resistance, and capacitance methods.
• EN 13647: Determination of geometrical characteristics for wood flooring, panelling, and cladding.
• EN 13307-1: Requirements for finger-jointed timber profiles.
• EN 13556: Nomenclature of timbers used in Europe.
• CEN/TS 12169: Conformity assessment for lots of sawn timber.

These references ensure that EN 15146:2026 aligns with broader industry practices and regulatory frameworks.

By adhering to EN 15146:2026, stakeholders can drive quality, safety, and market consistency in the use of solid softwood panelling and cladding without tongue and groove, across both interior and exterior applications.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 15146:2025
01-julij-2025
Notranje in zunanje obloge iz masivnega lesa - Profili brez utora in peresa
Solid softwood panelling and cladding - Machined profiles without tongue and groove
Innen- und Außenbekleidungen aus massivem Nadelholz - Profilholz ohne Nut und
Feder
Lambris et bardages en bois massif résineux - Profilés usinés sans rainure et languette
Ta slovenski standard je istoveten z: prEN 15146
ICS:
79.080 Polizdelki iz lesa Semi-manufactures of timber
oSIST prEN 15146:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 15146:2025
oSIST prEN 15146:2025
DRAFT
EUROPEAN STANDARD
prEN 15146
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2025
ICS 79.080 Will supersede EN 15146:2006
English Version
Solid softwood panelling and cladding - Machined profiles
without tongue and groove
Lambris et bardages en bois massif résineux - Profilés Innen- und Außenbekleidungen aus massivem
usinés sans rainure et languette Nadelholz - Profilholz ohne Nut und Feder
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 175.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15146:2025 E
worldwide for CEN national Members.

oSIST prEN 15146:2025
prEN 15146:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Symbols and abbreviations . 5
5 Requirements . 5
5.1 General. 5
5.2 Grading . 6
5.2.1 General. 6
5.2.2 Grading classes . 6
5.2.3 Free grade . 9
5.3 Moisture content . 9
5.4 Geometrical characteristics . 9
5.4.1 General. 9
5.4.2 Profiles . 9
5.4.3 Dimensions and tolerances . 9
5.4.4 Surface machining . 11
6 Sampling . 12
7 Technical specifications and marking . 12
Annex A (normative) Requirements for the classification of a free grade . 13
Bibliography . 14

oSIST prEN 15146:2025
prEN 15146:2025 (E)
European foreword
This document (prEN 15146:2025) has been prepared by Technical Committee CEN/TC 175 “Round and
sawn timber”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15146:2006.
In comparison with the previous edition, the following technical modifications have been made:
— alignment of the series of product standards: EN 14519, EN 15146 and EN 14951;
— scope, normative references and terms and definitions updated;
— scope opened to all softwood species:
— ranges of moisture content for panelling and cladding were specified more precisely;
— CEN/TS 12169 was referenced for sampling methods instead of Annex A;
— clauses “Technical specifications” and “Marking” were merged and aligned;
— Annex A deleted.
This document is one of a series of standards concerning solid wood panelling and cladding and wood
flooring (including parquet).
oSIST prEN 15146:2025
prEN 15146:2025 (E)
1 Scope
This document specifies characteristics of solid wood panelling and cladding without tongue and groove
machined from softwoods (wood of trees of the botanical group gymnosperms). Products are intended
for interior or exterior use.
This document covers treated, untreated and surface treated products, including those made of thermally
and chemically modified wood, as well as finger jointed products.
This document does not cover processes for treatment, surface coating or modification.
NOTE Where further regulatory provisions (e.g. durability, reaction to fire, dangerous substances and
generally CE-marking according to CPR) are required, EN 14915 applies.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN 844, Round and sawn timber - Terminology
EN 1309-1, Round and sawn timber - Method of measurement of dimensions - Part 1: Sawn timber
EN 1309-3, Round and sawn timber - Methods of measurements - Part 3: Features and biological
degradations
EN 13183-1, Moisture content of a piece of sawn timber - Part 1: Determination by oven dry method
EN 13183-2, Moisture content of a piece of sawn timber — Part 2: Estimation by electrical resistance
method
EN 13183-3, Moisture content of a piece of sawn timber — Part 3: Estimation by capacitance method
EN 13647, Wood flooring and wood panelling and cladding - Determination of geometrical characteristics
EN 13756, Wood flooring and parquet - Terminology
oSIST prEN 15146:2025
prEN 15146:2025 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13756, EN 844, EN 1309-1,
EN 1309-3 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
panelling
elements of solid wood mainly for interior use which have been machined on the face and have been
regularised on the back
3.2
cladding
elements of solid wood mainly for exterior use which have been machined on the face and have been
regularised on the back
3.3
face
visible surfaces of an element when installed
Note 1 to entry: This includes edges and chamfers.
3.4
regularised (hit or missed)
feature of the surface of an element where some areas of a face remain untouched during the machining
process
3.5
end matching
profile at the end of the panelling or cladding including tongue and/or groove
4 Symbols and abbreviations
Symbols and abbreviations used in this document are given in Figure 1 and in Table 3 and Table 4.
5 Requirements
5.1 General
The softwood species shall be selected with regard to the appearance expected, the suitability for the
intended purpose and the general characteristics of the species itself. All requirements apply at the time
of production unless the manufacturer states otherwise.
Finger jointing according to EN 13307-1 is permitted if agreed upon and specified by the manufacturer.
NOTE Regarding the bonding and glue type other standards and regulations can apply.
oSIST prEN 15146:2025
prEN 15146:2025 (E)
5.2 Grading
5.2.1 General
Grading applies to the face only, unless otherwise specified. Machining requirements are covered in 5.4.4
and apply to all grades of all species.
The measurement of features shall be in accordance with EN 1309-3.
The elements may be finished with surface coating. The grading shall be done before coating.
Additionally, to the grading classes given in 5.2.2 different grading classes and quality criteria for
panelling and cladding exist on national and company levels in Europe. Hence, free grades according to
5.2.3 may also be used.
5.2.2 Grading classes
Grading and the features for softwoods (except maritime pine) are given in Table 1. Grading and the
features for maritime pine (Pinus pinaster) are given in Table 2.
A combined grading class, e.g. A/B, is permitted if agreed upon and specified by the manufacturer.
Table 1 — Grading classes of softwoods (except maritime pine)
a b
Features Grade A Grade B
Knots Permitted: Permitted:
— black pin knots up to 5 mm if not in — black pin knots up to 5 mm;
clusters;
— sound intergrown knots, partially
— sound intergrown knots up to 10 % of intergrown knots, barkringed knots,
the width plus 30 mm; splay knots, and dead knots up to
10 % of the width plus 50 mm;
— partially intergrown knots,
barkringed knots, splay knots and — occasional loose knots, knot-holes
dead knots (not loose); and unsound knots up to 15 mm;
— spruce/fir, and larch: up to 10 % of — knot p
...