SIST EN 15254-7:2026

• Abstract:

  This document defines rules for extended applications, provides guidance, and, where appropriate, specifies procedures, for variations of certain parameters and factors associated with the design of internal non-loadbearing ceilings constructed of metal faced sandwich panels that have been tested in accordance with EN 1364 2, which could generate a classification in accordance with EN 13501 2.; This document applies to double skin metal faced sandwich panels which have an insulating core bonded to both facings as defined in EN 14509, not stabilizing a whole building or parts of it.

• Status: Published
• Public Enquiry End Date: 27-Feb-2025
• Publication Date: 17-Aug-2026
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• ICS: 91.060.30 - Ceilings. Floors. Stairs
• Technical Committee: POZ - Požarna varnost
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Jul-2026
• Due Date: 04-Oct-2026
• Completion Date: 18-Aug-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/117 - Horizontal complement to the mandates to CEN/CENELEC concerning the execution of standardization work for the valuation of construction products and elements in respect of their resistance to fire
• Ref Project: EN 15254-7:2026 - Extended application of results from fire resistance tests - Non-loadbearing ceilings - Part 7: Metal sandwich panel construction

• Refers: SIST EN 13820:2004 - Thermal insulating materials for building applications - Determination of organic content
• Effective Date: 16-Sep-2026
• Refers: kSIST FprEN 1993-1-2:2023 - Eurocode 3 - Design of steel structures - Part 1-2: Structural fire design
• Effective Date: 12-Aug-2026
• Referred By: SIST EN 13501-2:2016 - Fire classification of construction products and building elements - Part 2: Classification using data from fire resistance tests, excluding ventilation services
• Effective Date: 29-Jul-2026
• Referred By: SIST EN 13501-2:2023 - Fire classification of construction products and building elements - Part 2: Classification using data from fire resistance and/or smoke control tests, excluding ventilation services
• Effective Date: 29-Jul-2026
• Revises: SIST EN 15254-7:2018 - Extended application of results from fire resistance tests - Non-loadbearing ceilings - Part 7: Metal sandwich panel construction
• Effective Date: 13-Dec-2023

Overview

SIST EN 15254-7:2026 specifies comprehensive rules, guidance, and procedures for extending the application of fire resistance test results for non-loadbearing ceilings constructed with metal sandwich panels. This Slovenian and European standard addresses variations in certain design and construction parameters for internal double skin, metal-faced sandwich panels with an insulating core bonded to both outer layers, as described in EN 14509. Importantly, the scope is limited to ceilings that do not stabilize any part of the building’s structure.

The standard ensures that when tested in accordance with EN 1364-2, these panels can be classified for fire resistance in line with EN 13501-2, allowing for safe, well-documented extensions of tested performances to modified or similar products and applications.

Key Topics

• Extended Application (EXAP) Rules: Outlines how to predict and justify the fire resistance performance of non-loadbearing metal sandwich panel ceilings when there are changes to certain material and construction parameters.
• Material Variations: Addresses permissible changes in metal facing thickness, coatings, adhesives, and core materials, including limits and requirements for each change.
• Construction Variations: Details on allowable modifications, such as span length, panel thickness, joint design, and fixing systems, while ensuring integrity and insulation are not compromised.
• Support and Fixing Systems: Requirements for the supporting structure and fixing methods to maintain compliance with fire resistance standards.
• Calculation and Reporting: Guidance on calculation methods for mechanical strength and temperature, and requirements for comprehensive reporting of extended application analyses.
• Critical Definitions: Clarifies terminology crucial for product and test specification, including direct and extended application fields, reference tests, assembly lengths and spans, and factor influences.

Applications

SIST EN 15254-7:2026 delivers practical value in several key settings:

• Building Design and Safety Compliance: Enables architects, engineers, and specifiers to apply proven fire resistance ratings to a range of metal sandwich panel ceiling configurations, saving time and costs on additional testing.
• Product Development: Manufacturers of sandwich panels can innovate or tailor products for varied applications, using the standard’s clear pathways for extending fire resistance classifications to new panel variants.
• Construction Projects: Facilitates risk assessment, documentation, and regulatory approval processes, especially for commercial, industrial, and institutional buildings where fire safety and performance consistency are essential.
• Certification and Market Access: Helps stakeholders achieve recognized fire classification under EN 13501-2, streamlining product acceptance across European markets.

Typical applications include internal non-loadbearing ceilings in commercial buildings, industrial facilities, and any development seeking efficiency with metal sandwich panel systems that require clear demonstration of fire-resistant properties.

Related Standards

Organizations and professionals referencing SIST EN 15254-7:2026 should also be aware of these key related standards:

• EN 1364-2: Fire resistance tests for non-loadbearing elements - Ceilings
• EN 13501-2: Fire classification of construction products and building elements - Part 2: Classification using data from fire resistance tests
• EN 14509: Self-supporting double skin metal faced insulating panels - Specifications
• EN 1363-1 / EN 1363-2: General and alternative procedures for fire resistance testing
• EN 15725: Extended application on fire performance of construction products - Principles and reports
• EN ISO 13943: Fire safety - Vocabulary
• EN 1993-1-2 (Eurocode 3): Structural fire design for steel structures

These standards provide the foundation for testing, classification, and extended application practices essential for compliance and safety in modern construction.

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Keywords: fire resistance, metal sandwich panels, non-loadbearing ceilings, EN 15254-7, extended application, building safety, fire classification, EN 1364-2, EN 13501-2, construction standards, insulation panels, fire testing, ceiling systems.

SLOVENSKI STANDARD
01-september-2026
Razširjena uporaba rezultatov preskusov požarne odpornosti - Nenosilni stropi - 7.
del: Konstrukcije iz kovinskih sendvič panelov
Extended application of results from fire resistance tests - Non-loadbearing ceilings -
Part 7: Metal sandwich panel construction
Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen -
Nichttragende Unterdecken - Teil 7: Sandwichelemente in Metallbauweise
Application étendue des résultats d'essais de résistance au feu - Plafonds non porteurs -
Partie 7 : Panneaux sandwiches métalliques pour la construction
Ta slovenski standard je istoveten z: EN 15254-7:2026
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.060.30 Stropi. Tla. Stopnice Ceilings. Floors. Stairs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15254-7
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 13.220.50 Supersedes EN 15254-7:2018
English Version
Extended application of results from fire resistance tests -
Non-loadbearing ceilings - Part 7: Metal sandwich panel
construction
Application étendue des résultats d'essais de Erweiterter Anwendungsbereich der Ergebnisse von
résistance au feu - Plafonds non porteurs - Partie 7 : Feuerwiderstandsprüfungen - Nichttragende
Panneaux sandwiches métalliques pour la construction Unterdecken - Teil 7: Sandwichelemente in
Metallbauweise
This European Standard was approved by CEN on 15 June 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15254-7:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms, definitions, symbols and abbreviations . 4
3.1 Terms and definitions . 4
3.2 Symbols and abbreviations . 6
4 Establishing the field of extended application . 7
4.1 General . 7
4.2 Assumptions in the extended application . 7
5 Rules for extended applications of the tested product/construction . 7
5.1 General . 7
5.2 Variations in the materials of the product . 10
5.2.1 General . 10
5.2.2 Variations in the metal sheets . 10
5.2.3 Variations in the adhesive . 11
5.2.4 Variations in the core material . 11
5.3 Variations in the construction . 13
5.3.1 Variations in span length . 13
5.3.2 Variations in the panel thickness . 13
5.3.3 Variations in the longitudinal joint construction . 13
5.3.4 Variations in the boundary conditions and fixing system . 14
5.3.5 Length and width of ceiling construction . 14
5.4 Interaction between the factor influences . 14
5.5 Support structure . 14
5.6 Heating conditions . 15
6 Calculation methods and additional measurements . 15
6.1 Calculation methods . 15
6.1.1 General . 15
6.1.2 Calculation of strength properties . 15
6.2 Additional measurements to be carried out in the reference test . 15
7 Report of the extended application analysis . 16
Annex A (informative) Typical behaviour of a sandwich panel ceiling when exposed to fire . 17
Annex B (normative) Typical examples of sandwich panel ceiling end fixings to support
structure . 18
Annex C (normative) Rules and calculation methods for extending the span length of
sandwich panel ceilings . 21
Bibliography . 24
European foreword
This document (EN 15254-7:2026) has been prepared by Technical Committee CEN/TC 127 “Fire safety
in buildings”, the secretariat of which is held by BSI.
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 January 2027, and conflicting national standards shall
be withdrawn at the latest by January 2027.
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 15254-7:2018.
The EN 15254 series, under the general title Extended application of results from fire resistance tests —
Non-loadbearing walls, comprises the following parts:
— Part 2: Masonry and gypsum blocks;
— Part 3: Lightweight partitions;
— Part 4: Glazed constructions;
— Part 5: Metal sandwich panel construction;
— Part 6: Curtain walling;
— Part 7: Metal sandwich panel construction.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
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.
1 Scope
This document defines rules for extended applications, provides guidance, and, where appropriate,
specifies procedures, for variations of certain parameters and factors associated with the design of
internal non-loadbearing ceilings constructed of metal faced sandwich panels that have been tested in
accordance with EN 1364-2, which could generate a classification in accordance with EN 13501-2.
This document applies to double skin metal faced sandwich panels which have an insulating core bonded
to both facings as defined in EN 14509, not stabilizing a whole building or parts of it.
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 1363-1, Fire resistance tests - Part 1: General requirements
EN 1363-2, Fire resistance tests - Part 2: Alternative and additional procedures
EN 1364-2, Fire resistance tests for non-loadbearing elements - Part 2: Ceilings
EN 1993-1-2, Eurocode 3 - Design of steel structures - Part 1-2: Structural fire design
EN 13820, Thermal insulating materials for building applications - Determination of organic content
EN 13501-2, Fire classification of construction products and building elements - Part 2: Classification using
data from fire resistance and/or smoke control tests, excluding ventilation services
EN 14509:2013, Self-supporting double skin metal faced insulating panels - Factory made products -
Specifications
EN 15725:2023, Extended application on the fire performance of construction products and building
elements: Principle of EXAP standards and EXAP reports
EN ISO 13943, Fire safety - Vocabulary (ISO 13943)
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purpose of this document, the terms and definitions given in EN 14509, EN 15725, EN 1364-2,
EN 1363-1 and EN ISO 13943 the following apply.
ISO and IEC maintain terminological 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/
3.1.1
direct field of application
outcome of a process (involving the application of defined rules) whereby a test result is deemed to be
equally valid for variations in one or more of the product properties and/or intended end-use
applications
3.1.2
extended field of application
outcome of a process (involving the application of defined rules that may incorporate calculation
procedures) that predicts, for a variation of a product property and/or its intended end-use
application(s), a test result on the basis of one or more test results to the same test standard
3.1.3
factor
variation that can be applied to a parameter
EXAMPLE A change in the core thickness
3.1.4
factor influence
potential cause of a change in the fire resistance when the factor is changed
EXAMPLE Increase in fire resistance as result of an increase of the thickness of the core
3.1.5
fastening
fixing
component that fastens the panels to a support structure or to the test frame
3.1.6
fixing system
system consisting of fastenings and other possible means used to fasten the panels to a support structure
or to the test frame
3.1.7
length
length of the ceiling in the span (or panel length) direction in the reference test or in the end
use application
3.1.8
width
width of the ceiling in the cross direction of the span (or panel length) in the reference test
or in the end-use application
3.1.9
reference test
fire resistance test on which the extended application is based and the results of which are used as the
main source of data for the extended application
Note 1 to entry: The fire resistance test shall be in accordance with EN 1363-1 and EN 1364-2, and where
applicable EN 1363-2.
3.1.10
stitching
component for fixing panels to panels in the longitudinal joint
3.1.11
span length
centre to centre distance between two consecutive supports to which the sandwich panel is fixed
3.1.12
support structure
construction onto which the panel ceiling is fastened in the end-use application
3.1.13
supporting construction
construction that may be required for the testing of some building elements into which the test specimen
is assembled
3.1.14
test frame
frame containing the test construction for the purpose of mounting onto the furnace
3.1.15
fire resistance classification period
time of fire separation function depending on E (integrity), I (insulation), W (radiation), as described in
EN 13501-2
EXAMPLE Test result 48 min., fire classification time 45 min.
3.2 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
E integrity (etanchéité)
F load
F catenary force acting on the fasteners
Ed
F vertical force due to g acting at the fastener
v
F catenary force acting at the fastener at maximum temperature in the test
Ed1
F catenary force acting at the fastener at temperature for the increased span
Ed2
F vertical force due to g acting at the fastener at maximum temperature in the test
v1
F vertical force due to g acting at the fastener at temperature for the increased span
v2
I isolation
L span length
T temperature
b width of panel
d depth of core
c
g panel weight per square meter
n number of fasteners
p relative end movement in the fastener
w deflection of the ceiling
α linear coefficient of thermal expansion
4 Establishing the field of extended application
4.1 General
An extended application analysis is required when the application differs in one or more parameters from
the one tested and described in the test report and/or in the classification document, and which is not
(fully) covered by the field of direct application of the classification document.
Extended application is a prediction of the expected fire resistance of fire-resistant metal faced sandwich
panels. It can be based on interpolation between or extrapolation from test data. The fundamental
consideration shall be that the fire-resistant metal faced sandwich panels after extension would achieve
the required fire performance if it were to be tested according to EN 1364-2.
The extended application of test results from metal faced sandwich panels used as a non-loadbearing
ceiling shall be based on the reference fire test results performed according to EN 1364-2 and can be
complemented by one or more additional tests. The general rules in EN 15725 shall be followed.
The necessary information for extrapolation of test results shall be assessed during the sampling and
testing as specified in EN 14509:2013.
4.2 Assumptions in the extended application
The following assumptions are considered when evaluating extended applications for sandwich panels:
a) The ceiling is required to provide fire resistance and shall be classified according to EN 13501-2.
b) The ceiling is assumed to be exposed on one side (either from above or below) to the standardized
heating conditions given in the fire resistance test specification in EN 1363-1 or to alternative and
additional procedures given in EN 1363-2 (see also Annex A).
c) The supporting construction to which the ceiling is fixed does not significantly deflect during the fire
exposure period.
d) After delamination of the fire exposed facing, the dead load of the panels is carried by a support
structure to which the ends of the sandwich panels are attached; the forces from the dead load will
be distributed to the support structure by the panel fixings from which loadbearing capacity shall be
evaluated.
e) The support structure has at least the same loadbearing capacity, R, of the fire resistance
performance as required fire resistance classification period of the the sandwich panel ceiling, if the
support structure is on the fire exposed side in end use condition.
f) The self-weight of the facing and core is calculated from the volume and density of the materials.
g) The calculation of the reduction in the strength properties of steel at elevated temperature shall be
in accordance with EN 1993-1-2.
5 Rules for extended applications of the tested product/construction
5.1 General
When performing extended applications for a tested ceiling, changes can occur either in the materials
and/or in the construction. Both are dealt with in this document. Table 1 and Table 2 list the changes
which can or cannot be made in an extended application assessment. The rules for the changes are either
given in Table 1 or Table 2 or in 5.2 and 5.3.
Table 1 — Material changes relevant to extended application
Parameter Factors Factor influence on Rules
performance
Integrity E Insulation I
a
Changes in Chemical influence no influence 5.2.2.1
metal facings composition of
coating
Change of colour influence influence 5.2.2.1
Change between influence influence 5.2.2.1
coated and non-
coated metal
a
Sheet thickness influence no influence Allowed up
to ± 0,2 mm of
tested thickness
Change from one influence influence 5.2.2.2
metal to another
Change in sheet influence influence 5.2.2.3
geometry
Changes in Amount influence influence 5.2.3
adhesive
a
Type influence no influence 5.2.3
Changes in Type major influence major 5.2.4
core material influence
Change in major influence major 5.2.4.2 to 5.2.4.6
composition influence
a
It is understood that when a change in a factor can influence the integrity of a joint, there is a
possibility that a change in the leakage of hot gases or in joint geometry can also influence the
temperature rise near the joint and therefore influence the insulation rating.
Table 2 — Constructional changes relevant to extended application
Parameter Factors Factor influence on Rules
performance
Integrity E Insulation I
Span length Decrease no influence no influence Allowed
a
Increase influence no influence 5.3.1
Panel width Decrease no influence no influence Allowed
a
Increase influence no influence Test results valid
up to + 20 %
Panel thickness Decrease influence major 5.3.2
e.g. core influence
thickness
Increase influence major 5.3.2
influence
Joint Type major influence major 5.3.3
construction influence
Stitching influence influence Not allowed
decreased
Stitching influence influence 5.3.3
increased
Sealants influence influence 5.3.3
a
Fixing system Type major influence no influence 5.3.4
a
Amount major influence no influence 5.3.4
decreased
a
Amount increased influence no influence Allowed
Protection major influence influence 5.3.4
decreased
Protection influence influence Allowed
increased
Length of Decrease no influence no influence 5.3.5
assembly
a
Increase influence no influence 5.3.5
Width of Decrease no influence no influence 5.3.5
assembly
Increase no influence no influence 5.3.5
a
Support Changes influence no influence 5.5
structure
a
It is understood that when a change in a factor can influence the integrity of a joint, there is a
possibility that a change in the leakage of hot gases or in joint geometry can also influence the
temperature rise near the joint and therefore influence the insulation rating.
5.2 Variations in the materials of the product
5.2.1 General
Metal faced sandwich panels consist of three main materials: facing metal sheets, adhesive and core
material. In the case of auto-adhesively bonded panels, the foamed core material also forms the adhesive
layer during the foaming process.
Changes in the components of a panel can have influences on the fire resistance. The rules in Clause 5
apply to such changes.
5.2.2 Variations in the metal sheets
5.2.2.1 Variations in the coatings
Organic surface coating on fire exposed side has no influence on the fire resistance.
Organic surface coating on unexposed side has influence on the fire resistance:
— Test results for very light colours are also valid for sandwich panels with light colours and dark
colours (colour definition acc. to EN 14509:2013, Annex E).
— Test results for light metallic colours are also valid for sandwich panels with very light colours, light
colours and dark colours (colour definition acc. to EN 14509:2013, Annex E).
— Test results for light colours are also valid for sandwich panels with dark colours (colour definition
acc. to EN 14509:2013, Annex E).
— Test results achieved with panels with organic coated metal sheet are not valid for panels without
organic coating.
Test results achieved with panels without organic coating are valid for panels with
...