EN 17873:2023

SLOVENSKI STANDARD
01-marec-2024
Hidroizolacijski trakovi - Podložne folije za strešne kritine in stene - Navodila za
montažo in pritrditev za požarno testiranje
Flexible sheets for waterproofing - Underlays for discontinuous roof coverings and walls -
Instructions for mounting and fixing for reaction to fire testing
Abdichtungsbahnen - Unterdeck- und Unterspannbahnen für Dachdeckungen und
Wände - Anleitung für Befestigung und Montage für die Prüfung zum Brandverhalten
Feuilles souples d'étanchéité - Écrans souples de sous-toiture pour couverture en petits
éléments discontinus et écrans souples pour murs extérieurs - Instructions de montage
et de fixation pour l’essai de réaction au feu
Ta slovenski standard je istoveten z: EN 17873:2023
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.100.50 Veziva. Tesnilni materiali Binders. Sealing materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17873
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 13.220.50; 91.100.50
English Version
Flexible sheets for waterproofing - Underlays for
discontinuous roof coverings and walls - Instructions for
mounting and fixing for reaction to fire testing
Feuilles souples d'étanchéité - Écrans souples de sous- Abdichtungsbahnen - Unterdeck- und
toiture pour couverture en petits éléments discontinus Unterspannbahnen für Dachdeckungen und Wände -
et écrans souples pour murs extérieurs - Instructions Anleitung für Befestigung und Montage für die Prüfung
de montage et de fixation pour l'essai de réaction au zum Brandverhalten
feu
This European Standard was approved by CEN on 20 November 2023.

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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17873:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Instructions for mounting and fixing of test specimens . 7
5.1 General . 7
5.2 Product and installation parameters . 7
5.3 Mounting and fixing . 7
5.3.1 Ignitability test . 7
5.3.2 “Single burning item (SBI) test” . 8
5.4 Development of extended application rules .10
Bibliography .11
European foreword
This document (EN 17873:2023) has been prepared by Technical Committee CEN/TC 254 “Flexible
sheets for waterproofing”, the secretariat of which is held by NEN.
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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, 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 the United
Kingdom.
Introduction
This document supports the existing product standards for factory made underlays for discontinuous
roof coverings and walls by complementing the instructions for mounting and fixing for reaction to fire
testing. The information given in this document comprises exposure to thermal attack, choice of
substrates, consideration and orientation of joints and edges as well as product orientation and fixation
of test specimen, to define unambiguous test conditions in the small-scale burner test and in the single
burning item test.
1 Scope
This document specifies instructions for mounting and fixing for reaction to fire testing of factory-made
underlays for discontinuous roof coverings and walls and contains provisions for direct and extended
application rules.
These mounting and fixing procedures are not intended to be used for flat roofed waterproofing
applications.
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 13238:2010, Reaction to fire tests for building products — Conditioning procedures and general rules
for selection of substrates
EN 13501-1:2018, Fire classification of construction products and building elements — Part 1:
Classification using data from reaction to fire tests
EN 13823:2020+A1:2022, Reaction to fire tests for building products — Building products excluding
floorings exposed to the thermal attack by a single burning item
EN 13859-1:2010, Flexible sheets for waterproofing — Definitions and characteristics of underlays —
Part 1: Underlays for discontinuous roofing
EN 13859-2:2010, Flexible sheets for waterproofing — Definitions and characteristics of underlays —
Part 2: Underlays for walls
EN ISO 11925-2:2020, Reaction to fire tests — Ignitability of products subjected to direct impingement of
flame — Part 2: Single-flame source test (ISO 11925-2:2020)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13859-1:2010,
EN 13859-2:2010, EN 13823:2020+A1:2022 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
underlay
factory-made flexible sheet of plastics, bitumen, rubber or other suitable material, which is used
underneath roof coverings or behind external wall coverings with the purpose to function as a secondary
water draining layer either installed free-hanging, installed with a ventilated or non-ventilated air gap or
installed supported by a substrate
Note 1 to entry: Examples of roof covering are tiles, slates, metal sheets, etc.
Note 2 to entry: Examples of wall covering are boards, tiles or battens that can be made of concrete, metal or wood.
3.2
integrated seam
integrated adhesive positioned within the overlap of the underlay once installed
3.3
outside-facing side of the underlay
side exposed to weathering whilst the roof or wall is open
Note 1 to entry: In most cases this is the printed side.
3.4
inside-facing side of th
...