SIST EN 13171:2013+A1:2015/oprA2:2018

Thermal insulation products for buildings - Factory made wood fibre (WF) products - Specification

DOW = DAV + 21 months

Wärmedämmstoffe für Gebäude - Werksmäßig hergestellte Produkte aus Holzfasern (WF) - Spezifikation

Produits isolants thermiques pour le bâtiment - Produits manufacturés en fibres de bois (WF) - Spécification

Toplotnoizolacijski proizvodi za stavbe - Proizvodi iz lesnih vlaken (WF) - Specifikacija

General Information

• Status: Not Published
• Public Enquiry End Date: 25-Nov-2018
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: TOP - Thermal insulation
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 06-Sep-2018
• Due Date: 24-Jan-2019
• Completion Date: 20-Nov-2018
• Directive: 305/2011 - 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/103 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on thermal insulating products
• Ref Project: EN 13171:2012+A1:2015/FprA2 - Thermal insulation products for buildings - Factory made wood fibre (WF) products - Specification

Relations

• Amends: SIST EN 13171:2013+A1:2015 - Thermal insulation products for buildings - Factory made wood fibre (WF) products - Specification
• Effective Date: 06-Sep-2017

Overview

SIST EN 13171:2013+A1:2015/oprA2:2018 is a European standard developed by CEN and maintained by Technical Committee CEN/TC 88 - "Thermal insulating materials and products." It specifies the requirements for factory-made wood fibre (WF) thermal insulation products used in buildings. This standard ensures consistent product quality, safety, and performance by defining essential characteristics, testing methods, and conformity assessment procedures. It applies to wood fibre insulation products with or without facings or coatings, produced predominantly from at least 80% wood fibres.

Updated through amendment A2 in 2018, the standard introduces critical refinements such as test procedures for continuous smouldering combustion, revisions to release of dangerous substances, and alignment with the EU Construction Products Regulation (CPR). EN 13171 provides harmonized specifications across all CEN member countries, supporting energy-efficient and environmentally sustainable building practices.

Key Topics

• Product Scope and Definitions
  EN 13171 covers wood fibre insulation products manufactured as mats, batts, felts, rolls, lamella rolls, and boards or slabs. Wood fibres are sourced from fresh or recycled wood, explicitly excluding biocides and PCP (pentachlorophenol).

• Thermal Performance Requirements
  Thermal resistance (R-value) and thermal conductivity (λ) must be measured and declared according to defined protocols (e.g., EN 12667). Thermal resistance is reported with precision and standardized rounding, ensuring reliable insulation performance metrics.

• Physical and Mechanical Properties
  The standard specifies testing for tensile strength (parallel and perpendicular to faces), compressive stress, dimensional stability under various climatic conditions, flatness, thickness, and sound absorption. For example, tensile strength for handling must be at least 1 kPa.

• Fire Safety and Smouldering Resistance
  EN 13171 mandates assessment of product behavior to fire, including a new clause on propensity to undergo continuous smouldering tested following EN 16733 procedures. Declarations on smouldering characteristics are standardized using symbols:

  • NoS (No smouldering)
  • S (Smouldering)
  • ANP (Assessment not possible)

• Release of Dangerous Substances
  Manufacturers must assess emissions to indoor air using EN 16516, ensuring compliance with health and environmental safety legislation. The standard references EU LCI (Lowest Concentration of Interest) values for hazardous substances.

• Conformity and Performance Verification
  Assessment and Verification of Constancy of Performance (AVCP) follows EN 13172 guidelines. Factory Production Control (FPC) by manufacturers includes type testing (TT) and ongoing quality checks to maintain compliance with declared performances.

Applications

EN 13171-certified wood fibre insulation products are used widely for thermal insulation in residential, commercial, and industrial buildings. Practical applications include:

• Wall, Roof, and Floor Insulation
  Wood fibre boards and rolls provide sustainable insulation solutions characterized by good thermal performance, vapor permeability, and fire safety, suitable for various building envelope configurations.

• Eco-friendly Construction
  Due to their natural composition and recyclability, wood fibre insulation products align with green building practices, enhancing energy efficiency and indoor air quality.

• Sound Insulation
  The standard covers acoustic properties, making these wood fibre products suitable for noise reduction in multi-family residences, offices, and public spaces.

• Renovation and New Build Projects
  The durability, mechanical strength, and dimensional stability specifications enable usage in retrofits and new constructions, meeting evolving building codes and environmental requirements.

Related Standards

EN 13171 interacts with multiple European and international standards, ensuring a comprehensive framework for thermal insulation:

• EN 12667 & EN 12939 - Methods for measuring thermal resistance and conductivity.
• EN 1602 - Determination of apparent density of insulation products.
• EN 1608 & EN 826 - Testing of tensile strength and compressive stress, respectively.
• EN 16516 - Assessment of dangerous substance emissions to indoor air.
• EN 16733 - Testing for continuous smouldering propensity of building materials.
• EN 13501-1 & EN 15715 - Fire classification and reaction to fire testing of construction products.
• EN ISO 12572 - Water vapor transmission properties for insulation.
• EN 13172 - Assessment and verification of performance consistency for thermal insulation products.

This integrated standards ecosystem ensures that wood fibre insulation under EN 13171 delivers reliable, safe, and sustainable thermal insulation solutions suitable for the European construction market and beyond.

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Keywords: EN 13171, wood fibre thermal insulation, factory made insulation, building insulation products, thermal resistance, fire safety, smouldering combustion, release of dangerous substances, conformity assessment, sustainable building materials, CEN standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2018
Toplotnoizolacijski proizvodi za stavbe - Proizvodi iz lesnih vlaken (WF) -
Specifikacija
Thermal insulation products for buildings - Factory made wood fibre (WF) products -
Specification
Wärmedämmstoffe für Gebäude - Werksmäßig hergestellte Produkte aus Holzfasern
(WF) - Spezifikation
Produits isolants thermiques pour le bâtiment - Produits manufacturés en fibres de bois
(WF) - Spécification
Ta slovenski standard je istoveten z: EN 13171:2012+A1:2015/prA2
ICS:
91.100.60 0DWHULDOL]DWRSORWQRLQ Thermal and sound insulating
]YRþQRL]RODFLMR materials
SIST EN en,fr,de
13171:2013+A1:2015/oprA2:2018
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 13171:2012+A1:2015
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
September 2018
ICS 91.100.60
English Version
Thermal insulation products for buildings - Factory made
wood fibre (WF) products - Specification
Produits isolants thermiques pour le bâtiment - Wärmedämmstoffe für Gebäude - Werksmäßig
Produits manufacturés en fibres de bois (WF) - hergestellte Produkte aus Holzfasern (WF) -
Spécification Spezifikation
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 88.

This draft amendment A2, if approved, will modify the European Standard EN 13171:2012+A1:2015. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment 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, 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.
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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13171:2012+A1:2015/prA2:2018 E
worldwide for CEN national Members.

EN 13171:2012+A1:2015/prA2:2018 (E)
Contents Page
European foreword . 3
1 Modifications to the European foreword . 4
2 Modifications to the Scope . 4
3 Modifications to Clause 2, Normative references . 4
4 Modifications to Clause 3, Terms, definitions, symbols, units and abbreviated terms . 5
5 Modifications to 4.2.1, Thermal resistance and thermal conductivity . 5
6 Modification to 4.3.1, General . 5
7 Modification to 4.3.2, Dimensional stability. 6
8 Modification to 4.3.5, Tensile strength parallel to faces . 6
9 Modification to 4.3.15, Release of dangerous substances . 6
10 Modifications to 4.3.17, Continuous glowing combustion . 6
11 Modification to 5.2, Conditioning . 7
12 Modification to 5.3.2, Thermal resistance and thermal conductivity . 7
13 Modification to Clause 6, Designation code . 9
14 Modification to Clause 7, Assessment and Verification of the Constancy of
Performance (AVCP) . 9
15 Modification to A.2, Input data . 10
16 Modification to Annex B, Product type determination (PTD) and factory production
control (FPC) . 10
17 Modification to C.4, Evaluation of conformity. 15
18 Modification to E.3, Shear strength . 15
19 Modification to Annex ZA, Clauses of this European Standard addressing the
provisions of the EU Construction Products Regulation . 15

EN 13171:2012+A1:2015/prA2:2018 (E)
European foreword
This document (EN 13171:2012+A1:2015/prA2:2018) has been prepared by Technical Committee
CEN/TC 88 “Thermal insulating materials and products”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
For relationship with EU Regulation, see informative Annex ZA which is an integral part of this
document.
EN 13171:2012+A1:2015/prA2:2018 (E)
1 Modifications to the European foreword
In the fourth paragraph, delete ", and supports essential requirements of EU Directive(s)".
Delete the ninth paragraph and replace the tenth and eleventh paragraphs with the following:
"Amendment A2 modifies EN 13171:2012 and its A1 amendment. This amendment introduces or
corrects:
a) Introduced the clause "Continuous smouldering";
b) Modified the clause "Release of Dangerous substance";
c) Modified the definition for "class F" in the clause "reaction to fire";
d) Editorial modifications in different parts of the text and linked to the above modification;
e) Modifications to be in line with the CPR e.g. PTD replaced by TT;
f) Modified the Annex ZA.".
In the fourteenth paragraph, add the following standard to the end of the list of standards:
"EN 16069, Thermal insulation products for buildings — Factory made products of polyethylene foam
(PEF) — Specification".
2 Modifications to the Scope
Replace the first sentence with:
"This European Standard specifies the characteristics for factory made wood fibre (WF) products, with
1)
or without facings or coatings, which are used for the thermal insulation of buildings .".
Replace the third paragraph with:
"This standard describes product characteristics and includes procedures for testing, assessment and
verification of constancy of performance (AVCP), marking and labelling.".
3 Modifications to Clause 2, Normative references
Delete the reference "EN 12086:1997".
Add the following references:
"EN 16516, Construction products - Assessment of release of dangerous substances - Determination of
emissions to indoor air
EN 16733:2016, Reaction to fire for building products - Determination of a building product´s propensity
to undergo continous smouldering"
and
"EN ISO 12572, Thermal insulating products for building applications — Determination of water vapour
transmission properties".
1) Wood fibre products for applications other than thermal insulation are covered by EN 316.
EN 13171:2012+A1:2015/prA2:2018 (E)
4 Modifications to Clause 3, Terms, definitions, symbols, units and abbreviated
terms
Replace the term and definition of "wood fibre products" with the following:
"3.1.1
wood fibre products
insulation product including bonded products manufactured from wood fibres with or without the
addition of bonding agents and/or additives consisting of at least 80 % wood fibres per mass, produced
either from fresh wood or from recycled wood that contains no PCP (pentachlorphenol) or biocides
Note 1 to entry Wood fibre products are manufactured as mat, batt, felt, roll, lamella roll and board
(slab).".
Delete the term and definition for "3.1.2 level" and "3.1.3 class" and modify the numbers of the remaining
terms accordingly.
Add the following symbols:
"
S-NoS is the Continous-Smouldering declaration (NoS means no Smouldering and S means
Smouldering)
ANP Smouldering assessment not possible
".
Delete the following abbreviated terms:
PTD is Product Type Determination (previously named ITT for Initial Type Test)
VCP is Verification of Constancy of Performance (previously named evaluation of conformity)
Add the following abbreviated term:
"
TT is Type Testing
".
5 Modifications to 4.2.1, Thermal resistance and thermal conductivity
Replace the second paragraph with the following:
"The thermal resistance and thermal conductivity shall be determined in accordance with Annex A and
declared according to the following:".
Replace the eighth item of the list with the following:
"
— the statistical value of thermal resistance, R , when calculated from the nominal thickness, d ,
90/90 N
and the corresponding declared thermal conductivity, λ , shall be rounded downwards to the
90/90
2 2
nearest 0,05 m ⋅K/W, and declared in levels with steps of 0,05 m ⋅K/W;".
6 Modification to 4.3.1, General
Replace the paragraph with:
"If there is no requirement for a property, described in 4.3, for a product in use, then the property does
not need to be determined and declared.".
EN 13171:2012+A1:2015/prA2:2018 (E)
7 Modification to 4.3.2, Dimensional stability
Replace the second sentence with the following:
"The test shall be carried out for the conditions given in Table 2. The test specimen shall then be
reconditioned at (23 ± 2) °C and (50 ± 5) % relative humidity for 24 h.".
8 Modification to 4.3.5, Tensile strength parallel to faces
Replace the first paragraph with the following:
"Tensile strength parallel to faces, σ , shall be determined in accordance with EN 1608. For handling
t
purposes, products shall have a tensile strength parallel to faces of 1 kPa.".
9 Modification to 4.3.15, Release of dangerous substances
Replace the text in the clause with the following:
2)
"If the release of dangerous substances into indoor air is tested, this shall be done according to
EN 16516.
NOTE An informative database covering European and national provisions on dangerous substances is
available at the Construction web site on EUROPA accessed through: http://ec.europa.eu/growth/tools-
databases/cp-ds.".
10 Modifications to 4.3.17, Continuous glowing combustion
Replace the current title with "Propensity to undergo continuous smouldering" and replace the text in
the clause with the following:
"When declared, the propensity to undergo continuous smouldering of wood fibre products shall be
tested according to EN 16733. The following conditions and parameters shall be considered within the
tests:
— type of binder and additives;
— density according to EN 1602;
— thickness to be determined by test according EN 823;
— without any facings, coatings or suchlike – existing facings or coatings shall be removed when
preparing the test specimens.
The tests shall be done without consideration of the intended end-use conditions. If the paragraph 6.2.5
of EN 16733:2016 applies, a permanent contact between the pieces shall be assured.
The results of tests considering the aforementioned parameters in fully are also valid for products:
— of same binder type and additives;
— with equal or lower density;
— with lower thickness and also with higher thickness when 100 mm thick specimens were tested;

2) See for reference the LCI list of the European Commission "Agreed EU-LCI values"
(http://ec.europa.eu/growth/sectors/construction/eu-lci/values_en).
EN 13171:2012+A1:2015/prA2:2018 (E)
— with any facings or coatings or suchlike;
— for any end-use conditions.
If the test according to Clause 11 of EN 16733:2016 has been passed, declare: “the product does not
show propensity for continuous smouldering combustion”. If the test according to Clause 11 of
EN 16733:2016 has been failed, declare: “the product shows propensity for continuous smouldering
combustion”. If the assessment was not possible according to Clause 11 of EN 16733:2016, declare:
“assessment of the propensity for continuous smouldering combustion is not possible”.
If a Designation code is given, the following abbreviations shall be used:
— the product does not show propensity for continuous smouldering combustion: NoS
— the product shows propensity for continuous smouldering combustion: S
— the assessment of the propensity for continuous smouldering combustion is not possible: ANP".
11 Modification to 5.2, Conditioning
Replace the first item on the list with the following:
"
— step 1 (dry reference): The specimens are stored at (70 ± 2) °C, in an oven ventilated with an air
taken at (23 ± 2) °C and (50 ± 5) % relative humidity until constant mass. Constant mass is
achieved when the mass of the test specimen does not change more than 0,1% between two
consecutive measurements within 24 h. The mass of the test specimen at step 1 is m .".
23,dry
12 Modification to 5.3.2, Thermal resistance and thermal conductivity
Replace Table 8 with the following:
"Table 8 — Test methods, test specimens and conditions
Dimensions in millimetres
Clause Minimum
Test specimen
number of
Test Specific
length and
measurement
method conditions
No Title
a
s to get one
width
test result
4.2.1 Thermal resistance — EN 12667 or See EN 12667 1 –
thermal conductivity EN 12939 or EN 12939
4.2.2 Length and width EN 822 Full size 1 –
4.2.3 Thickness EN 823 Full size Roll, felt and Method B.1
matt: 1
50 Pa or 250 Pa
Board and See 4.2.3
slab: 3
4.2.4 Squareness EN 824 Full size Board and –
slab: 1
EN 13171:2012+A1:2015/prA2:2018 (E)
Clause Minimum
Test specimen
number of
Test Specific
length and
measurement
method conditions
No Title
a
s to get one
width
test result
4.2.5 Flatness EN 825 Full size Board and –
slab: 1
4.2.6 Reaction to fire of the See
product as placed on the See EN 13501-1 and EN 15715 EN 15715:2009,
market Clause 5
4.3.2 Dimensional stability under EN 1603 Full size 1 –
constant normal laboratory
conditions
Dimensional stability under EN 1604 200 × 200 3
specified temperature
Dimensional stability under EN 1604 200 × 200 3 –
specified temperature and
humidity conditions
4.3.3 Compressive stress or EN 826 200 × 200 5 Surface grinding
strength
300 × 300 3
4.3.4 Tensile strength EN 1607 200 × 200 5 –
perpendicular to faces
300 × 300 3
4.3.5 Tensile strength parallel to EN 1608 1 000 × 500 or 3
faces full size
4.3.6 Point load EN 12430 300 × 300 3 –
4.3.7 Compressive creep EN 1606 200 × 200 3 Grinding
4.3.8 Short term water absorption EN 1609 200 × 200 4 Method A
4.3.9 Water vapour transmission EN ISO See 6.1 in 3 b
12572 EN ISO 12572
4.3.10 Dynamic stiffness EN 29052-1 200 × 200 3 –
4.3.11 Thickness, d EN 12431
L
Thickness, d EN 12431 200 × 200 3 Class T6, T7
B
Long term thickness EN 1606
reduction
4.3.12 Sound absorption EN ISO 354 Minimum 10 m 1 To be reported
4.3.13 Air flow resistivity EN 29053 Apparatus 9 Method A
dependent
4.3.14 Apparent density EN 1602 ≥ (200 × 200) 3 v
4.3.15 Release of dangerous EN 16516 See EN 16516 See EN 16516 4.3.15
substances
EN 13171:2012+A1:2015/prA2:2018 (E)
Clause Minimum
Test specimen
number of
Test Specific
length and
measurement
method conditions
No Title
a
s to get one
width
test result
4.3.16 Reaction to fire of the See EN 13501-1 and EN 15715 See
product in standardized EN 15715:2009,
assemblies simulation end- Clause 6
use applications
4.3.17 Continuous smouldering EN 16733 See EN 16733 See EN 16733 See EN 16733
a
Full-size product thickness, except for 4.2.6. when the limit of the test methods are exceeded.
b
Exception: When testing products with water vapour barrier, in accordance with EN 12086, the specimen
thickness to measure is equal to the water vapour barrier thickness plus (2 to 3) mm.
".
13 Modification to Clause 6, Designation code
Replace the first sentence with the following:
"If a designation code is provided, it shall be given as follows:".
Add the following item to the list:
"
— Continous smouldering S - NoS or ANP
".
14 Modification to Clause 7, Assessment and Verification of the Constancy of
Performance (AVCP)
Replace the subclauses with the following:
"7.1 General
All performances related to characteristics included in this standard shall be determined when the
manufacturer intends to declare the respective performance unless the standard gives provisions for
declaring them without performing tests (e.g. use of previously existing d
...