prEN 15254-7

Extended application of results from fire resistance tests - Non-loadbearing walls - Part 7: Non-load bearing sandwich panels - Ceilings

This part of prEN 15254 defines rules for extended applications, provides guidance, and where appropriate defines procedures, for variations of certain parameters and factors associated with the design of internal non-loadbearing ceilings constructed of metal sandwich panels and that have been tested in accordance with EN 1364-2.
prEN XXXXX-X applies for self-supporting, double skin metal faced sandwich panels having an insulating core bonded to both facings as defined in EN 14509.

Erweiteter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprüfungen - Teil 16: Nichttragende Sandwich-Elemente - Decken

Application étendue des résultats des essais de résistance au feu - Panneaux isolants sandwich non porteurs - Plafonds

Razširjena uporaba rezultatov preskusov požarne odpornosti - Nenosilne stene - 7. del: Nenosilni sendvič elementi - Stropi

General Information

• Status: Not Published
• Publication Date: 15-May-2011
• Withdrawal Date: 15-Nov-2011
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• ICS: 91.060.30 - Ceilings. Floors. Stairs
• Technical Committee: CEN/TC 127 - Fire safety in buildings
• Drafting Committee: CEN/TC 127/WG 1 - Structural and separating elements
• Current Stage: 4098 - Decision to abandon - Enquiry
• Start Date: 15-Sep-2010
• Completion Date: 15-Sep-2010
• 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
• Directive: 89/106/EEC - Construction products
• 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: oSIST prEN 15254-7:2009 - Extended application of results from fire resistance tests - Non-loadbearing walls - Part 7: Non-load bearing sandwich panels - Ceilings

Overview

The prEN 15254-7 standard, developed by CEN Technical Committee 127, addresses the extended application of fire resistance test results specifically for non-loadbearing sandwich panel ceilings. These ceilings are constructed from self-supporting, double skin metal-faced sandwich panels with an insulating core, as defined in EN 14509. The standard provides detailed rules and guidance on how to apply fire resistance test outcomes from EN 1364-2 tests to variations in design parameters. It is crucial for ensuring that ceilings made from metal sandwich panels comply with fire safety requirements even when certain design modifications or material changes occur.

Key Topics

• Scope and Applicability
  The standard applies to internal non-loadbearing ceilings made of metal sandwich panels tested under EN 1364-2. It is relevant for panels with a metal facing and bonded insulating core, assessing fire resistance in terms of integrity and insulation.

• Extended Application Principles
  When a ceiling’s design or materials differ from those tested, this standard defines how to extend the original test results through analysis, additional small-scale or full-scale tests, or use of historical data, ensuring reliable fire resistance evaluation.

• Structural Behavior in Fire
  The document assumes one-sided fire exposure and considers factors like delamination of the exposed face and load transfer via fixings to the support structure. The tests simulate a non-deflecting support to maintain reference conditions.

• Material Variations
  Differences in metal facings (coatings, thickness up to ±50%) generally have limited influence on fire resistance and may be permissible under defined rules. However, the core material changes can significantly impact fire performance and must be carefully evaluated.

• Construction Adjustments
  Changes in span length, panel width, thickness, joint design, stitching, sealants, fixing systems, and assembly dimensions are addressed with specific criteria. Some increases are allowed within set limits, while other modifications-such as decreased stitching-are not permitted due to integrity concerns.

• Calculation and Testing Methods
  The standard outlines when and how to employ small-scale testing or calculation methods alongside reference fire tests to validate extended applications. It requires considering temperature effects on materials and fasteners, and mechanical forces including catenary action in fire.

Practical Applications

• Fire Safety Design
  Enables architects, engineers, and manufacturers to confidently modify sandwich panel ceiling designs without necessitating full fire resistance retesting for every change, saving time and costs.

• Compliance Demonstration
  Provides a structured approach for demonstrating compliance with fire resistance performance requirements in building regulations across European markets.

• Performance Optimization
  Assists manufacturers in optimizing the panel design, such as adjusting metal sheet coatings or panel sizes, while maintaining certified fire performance.

• Support Structure Assessment
  Guides on evaluating support structures and fixings to ensure loadbearing capacity during fire exposure, which is essential for safety and reliability.

Related Standards

• EN 1364-2: Fire resistance tests for non-loadbearing elements – Ceilings
• EN 14509: Factory-made self-supporting double skin metal faced insulating panels
• EN 13501-2: Fire classification of construction products and building elements based on fire resistance test data
• EN 1993-1-2: Eurocode 3 – Structural fire design of steel structures
• EN 1363-1 & EN 1363-2: General and additional fire resistance test methods and requirements
• EN 1991-1-2: Eurocode 1 – Actions on structures exposed to fire

Keywords

Extended application, fire resistance tests, non-loadbearing ceilings, metal sandwich panels, fire safety, EN 1364-2, prEN 15254-7, thermal insulation, integrity, fixing systems, adhesive variations, structural fire design, European fire standards, fire performance classification.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2009
5D]ãLUMHQDXSRUDEDUH]XOWDWRYSUHVNXVRYSRåDUQHRGSRUQRVWLGHO1HQRVLOQL
VHQGYLþHOHPHQWL6WURSL
Extended application of results from fire resistance tests - Non-loadbearing walls - Part 7:
Non-load bearing sandwich panels - Ceilings
Erweiteter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprüfungen - Teil
16: Nichttragende Sandwich-Elemente - Decken
Application étendue des résultats des essais de résistance au feu - Panneaux isolants
sandwich non porteurs - Plafonds
Ta slovenski standard je istoveten z: prEN 15254-7
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.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2009
ICS
English Version
Extended application of results from fire resistance tests - Non-
loadbearing walls - Part 7: Non-load bearing sandwich panels -
Ceilings
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 127.
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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15254-7:2009: E
worldwide for CEN national Members.

Contents Page
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 .5
4 Establishing the field of extended application .6
4.1 General .6
4.2 Assumptions in the extended application .6
4.3 Assumed structural behaviour of a sandwich panel in fire .6
5 Rules for extended applications of the tested product .7
5.1 General .7
5.2 Variations in the materials of the product .8
5.3 Variations in the construction . 11
5.4 Interaction between the factor influences . 12
5.5 Support structure. 12
5.6 Heating conditions. 13
6 Small scale tests and calculation methods . 13
6.1 Small scale tests . 13
6.2 Calculation methods . 13
6.3 Additional measurements to be carried out in the reference test . 14
7 Report of the extended application analysis . 14
Annex A - Informative . 15
Annex B - Normative. 17
Annex C - Normative. 19

Foreword
This document (prEN 15254-7:2009) has been prepared by Technical Committee CEN/TC 127 “Fire safety in
buildings”, the secretariat of which is held by BSI.
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, and supports essential requirements of EC Directive(s).
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of 89/106/EEC.
1 Scope
This part of prEN 15254 defines rules for extended applications, provides guidance, and where appropriate
defines procedures, for variations of certain parameters and factors associated with the design of internal non-
loadbearing ceilings constructed of metal sandwich panels and that have been tested in accordance with EN
1364-2.
prEN XXXXX-X applies for self-supporting, double skin metal faced sandwich panels having an insulating core
bonded to both facings as defined in EN 14509.
2 Normative references
This European Standard incorporates by dated or undated references, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to
this European Standard only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies (including amendments).
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 13501-2, Fire classification of construction products and building elements - Part 2: Classification using
data from fire resistance tests, excluding ventilation services.
EN 14509, Self-supporting double skin metal faced insulating panels - Factory made products - Specifications.
EN 1991-1-2, Eurocode 1. Actions on structures. - Part 1-2: General actions - Actions on structures exposed
to fire
EN 1993-1-2, Eurocode 3. Design of steel structures - Part 1-2: General rules. Structural fire design.
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 1364-2 and EN 1363-1
together with the following apply.
3.1.1 direct field of application of test results: the 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 of test results: the 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: One of the possible variations that may be applied to a parameter.
3.1.4 factor influence: One of the potential causes of a change in the fire resistance due to a factor.
3.1.5 fastening, fixing: Device that fastens the panels to a support structure or to the test frame.
3.1.6 fixing system: A system consisting of fastenings and possible other means to fasten the panels to a
support structure or to the test frame.
3.1.7 length of assembly: The 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 of assembly: The 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 in accordance with EN 1363-1 and EN 1364-2, and where
applicable EN 1363-2, on which the extended application is based and the results of which are used as the
main source of data for the extended application.
3.1.10 span, span length: Distance between supports.
3.1.11 stiching: The device for fixing panels to panels in the longitudinal joint.
3.1.12 span length: center to center distance between the supports of a panel and/or intermediate supports
to which the sandwich panel is fixed
3.1.13 support structure: The construction onto which the panel ceiling is fastened in the end use
application.
3.1.14 test frame: The frame containing the test construction for the purpose of mounting onto the furnace.
3.2 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
F the catenary force acting on the fasteners
Ed
F the design value for the fastener at normal temperature
Rd
L span length
T temperature
b width of panel
g panel weight per square meter
k decrease in yield strength due to increased temperature
n number of fasteners
p relative en 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
tested one described in the test report and/or in the classification document, and which is not covered by the
field of direct application of the classification document.
The extended application of the ceiling shall be based on the reference fire test results performed according to
EN 1364-2 and may be complemented by one or more additional small or full scale tests or by historical data.
If historical data are used they shall comply with the rules given in this document.
4.2 Assumptions in the extended application
The following assumptions are considered when evaluating extended applications for sandwich panels:
 the ceiling is required to possess fire resistance in the end-use condition. Relevant classes are given in
EN 13501-2,
 the ceiling is assumed to be exposed on the entire face of one side (either from above or below) to the
standardised heating conditions given in the EN 1363-1 fire resistance test specification
 the structure to which the ceiling is fixed does not deflect during the fire exposure period. This simulates
the non-deflecting nature of the test frame which forms part of the furnace test apparatus.
NOTE In reality constructions deflect and this should be taken into account when designing the building and planning
the constructional details,
 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 panels are attached. The forces from the dead load will be distributed to the
support structure by the panel fixings which loadbearing capacity must be evaluated,
 the support structure has at least the same loadbearing capacity R of the resistance to fire performance
as the ceiling regarding integrity,
 the self weight of the facing and core is calculated from the volume and density of the materials. For
calculation purposes the density of steel sheet shall be 7850 kg/m and the density of the core material at
elevated temperature shall be the density at room temperature,
 the calculation of the reduction in the strength properties of steel at elevated temperature shall be in
accordance with EN 1993-1-2.
4.3 Assumed structural behaviour of a sandwich panel in fire
When one face of a sandwich panel assembly is exposed to fire the following behaviour may be expected.
Delamination of the fire-exposed face will occur after a couple of minutes in a fire. After delamination the
flexural strength of the assembly is lost and, unless both faces are restrained at the ends, the panels can
collapse. The fastenings for the ends of the panels have to support the dead load of the whole panel for the
entire fire resistance period. The behaviour slightly differs depending on the direction of the fire (from above or
below). In both cases the structure acts as a catenary construction.
NOTE Annex A illustrates a typical behaviour of panels.
5 Rules for extended applications of the tested product
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 standard. Table 1 and Table 2 list the changes which may or may
not be made in an extended application assessment. The rules for the changes are given in chapters 5.2 and
5.3.
Table 1 —Material changes relevant to extended application
Parameter Factors Factor influence on performance Rules
Integrity E Insulation I
Changes in metal Chemical composition of influence no influence * 5.2.2.1
facings coating
Change from coated to no influence influence 5.2.2.1
non coated metal
Sheet thickness Influence no influence * Valid up to + 50 %
of tested thickness
Change from one metal no information no information 5.2.2.2
to another
Change in sheet no information no information 5.2.2.3
geometry
Changes in Amount Influence influence 5.2.3
adhesive
Type influence no influence * 5.2.3
Changes in core Type major influence major influence 5.2.4
material
Change in composition. major influence major influence 5.2.4.2 - 5.2.4.7

Table 2 — Constructional changes relevant to extended application
Parameter Factors Factor influence on performance Rules
Integrity E Insulation I
Span length Decrease no influence no influence Allowed

Increase influence no influence * 5.3.1
Panel width Decrease no influence no influence Allowed

Increase influence no influence * Test results valid up
to + 20 %
Panel thickness no information  major influence 5.3.2
e.g. core thickness
Joint construction Type major influence major influence 5.3.3
Stiching decreased influence influence Not allowed
Stiching increased influence influence 5.3.3
Sealants Influence influence 5.3.3
Fixing system Type major influence no influence * 5.3.4
Amount decreased major influence no influence * 5.3.4
Amount increased influence no influence * Allowed
Protection decreased major influence influence 5.3.4
Protection increased influence influence Allowed
Length of assembly Decrease no influence no influence 5.3.5
Increase Influence no influence * 5.3.5
Width of assembly Decrease no influence no influence 5.3.5
Increase no influence no influence 5.3.5
Support structure Changes no information no influence * 5.5
* 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 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
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 form the adhesive layer during the
foaming process.
Changes in the properties of the metal sheets will not affect the fire resistance results significantly and
changes can therefore be allowed. On the other hand even small changes in the core material can result in
big variations in the fire resistance test results. These facts are taken into account in the following rules.
5.2.2 Variations in the metal sheets
5.2.2.1 Variations in the coatings
The most essential property of the coating regarding fire resistance is the emissivity on the non-exposed side.
Normally the emissivity for a coated steel sheet is between 0.8 and 0.95. A change in emissivity of -10 % for a
new coating compared to the tested one is thus allowed if there is at least a 10 % margin in the insulation test
result compared to the I-classification. Test results are always valid for coatings with higher emissivity values
compared to the tested one. When a change in coating is made the manufacturer of the coated sheet shall
provide emissivity properties for the products.
A non-coated metal sheet can have an emissivity as low as 0.1. A change from a coated to a non-coated
sheet is therefore not allowed. The same rule as for coatings above applies also in this case. A decrease in
emissivity of 10 % is allowed if the emissivities for the different sheets are known.
For decrease in emissivity >10 % surface temperatures can be estimated from small-scale tests in
accordance with 6.1 where the surface temperatures of the new panel is compared to the one tested in the
reference scenario. If appropriate calculation methods are available the surface temperatures can also be
calculated and compared provided that temperature dependent thermal resistance values for the core material
are availably.
The energy content of the coating on the exposed side is small and will not affect the fire resistance properties
of the sandwich panel. Test results are valid for all coatings
If modifications in the coatings on the non-exposed side are made compared to the tested one, the ignitability
of the modified coating shall be higher or equal to that tested. This can be checked from small scale tests
according to 6.1. Test results are valid for all colours of the same type of coating.
5.2.2.2 Variations in the metal material
The following rules are valid for extended applications:
 the test results are valid for all grades of tested normal steel and stainless steel.
 for other types of metals the test result is valid for tested type only.
 for panels with perforated facings on one or both sides of the panels a test result achieved with a
perforated facing is always valid for non-perforated facings in the same position as in the tested product.
Test results for a product tested with non-perforated facings is valid only for a product with perforated
facings on the fire exposed side where the perforation area is not greater than 40 % and where the core
material is classified A2-s1, d0 or better. Other changes are not allowed.
5.2.2.3 Changes in profile geometry of facing
The following rules are valid for extended applications:
 for flat or small profiling (between 0 and 5 mm) test results are valid for any change
 for profiles greater than 5 mm test results are valid for variations + 50 % of profile depth.
5.2.3 Variations in the adhesive
This paragraph is valid only for panels with adhesively bonded cores. The following rules apply for an
°
adhesive with no strength at high temperatures (> 500 C) which means that the metal sheet on the exposed
side will disconnect from the core in the very beginning of a fire and the construction will loose its sandwich
capability. For this reason an organic adhesive
...