oSIST prEN 15254-7:2009
(Main)Extended application of results from fire resistance tests - Non-loadbearing walls - Part 7: Non-load bearing sandwich panels - Ceilings
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
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 15254-7:2009
01-september-2009
5D]ãLUMHQDXSRUDEDUH]XOWDWRYSUHVNXVRYSRåDUQHRGSRUQRVWLGHO 1HQRVLOQL
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
oSIST prEN 15254-7:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 15254-7:2009
EUROPEAN STANDARD
DRAFT
prEN 15254-7
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.
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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
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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.
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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.
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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
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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
3
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
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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
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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
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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 cannot be changed to a non-organic one or vice versa.
Normally the energy content of the adhesive is small and will not affect the fire resistance properties of the
sandwich panel. The following rules are valid for extended applications:
2
for PCS value 0 to 4 MJ/m . The results are valid for all adhesives when PCS value stays between 0 and
2
4 MJ/m .
2
for PCS value is > 4 MJ/m . The results are valid PCS values lower than the tested adhesive within
manufacturing tolerances.
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2
for PCS value > 4 MJ/m and > 1,15*PCS. Test results shall be reduced by the same % as the PCS value
is over the initial tested adhesive.
5.2.4 Variations in the core material
5.2.4.1 General
The following main core materials are used in sandwich panels: mineral wool, polyurethane, XPS, EPS,
phenolic foam and cellular glass. Mineral wool consists of stone wool and glass wool. The behaviour
regarding fire is different and cannot be compared from one material to another. Changes from one core
material to another are therefore not allowed in any extended application. Variations within each core material
group is allowed in accordance with the rules given in 5.2.4.2 to 5.2.4.7.
There are several factors in the different core materials affecting the fire properties of the core and of the
sandwich panel. It is therefore not possible to extend the results from one core material producer to be valid
for apparently similar materials from another producer.
5.2.4.2 MW
Generally the greater the density of the mineral wool the higher the flexural strength of the panel. Density will
be dictated by room-temperature structural design requirements. However, variation in density affects the I-
3
insulation value. The results are always valid for an increase in density in the density range 50 kg/m to 150
3
kg/m . A decrease in density is allowed down to -10 % of tested density.
Structural design will govern the orientation of fibres i.e. lamellas or slabs used in the panels. Changes in
orientation of fibre has an influence on fire resistance and is therefore not allowed.
Gaps between the lamellas or ends of lamella should be avoided. Test results are valid for panels with a
decrease in the number of lamella joints.
The mass of fibre binder used per unit volume of MW is governed by room-temperature structural design.
Variation in binder content can affect the fire resistance properties and the following rules shall be followed:
smaller amount of binder is always allowed compared to the tested one,
an increase in binder content of 2 % - units is allowed if the total amount of binder is below 10 %. For
example a result with 4 % binder is valid also for a core with 6 %. An increase is not allowed where the
binder content is greater than 10 %.
The nature and proportions of materials used to manufacture the MW fibres shall not be varied from those
used in the reference test. Changes from one manufacturer to another are therefore not allowed. Therefore it
is also to be noted that test results for stone wool panels can never be used for glass wool panels and vice
versa.
5.2.4.3 Polyurethane
The test results are valid for the same chemical system and blowing agent. The test results are valid for + 10
% of tested density.
5.2.4.4 XPS (extruded polystyrene) and EPS (expanded polystyrene)
Small changes in chemical composition can have a great influence on the test results and the results shall
only be used for the tested panels. No extended application is allowed.
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5.2.4.5 Phenolic foam
The test results are valid for the same chemical system and blowing agent. The test results are valid for + 10
% of tested density.
5.2.4.6 Cellular glass
Small changes in chemical composition can have a great influence on the test results and the results shall
only be used for the tested panels. No extended application is allowed.
5.3 Variations in the construction
5.3.1 Variations in span length
Two aspects of fire integrity shall be assessed. First the ability of the whole panel assembly to resist collapse
must be assessed when the adhesive bond fails on the exposed side and the panels lose their flexural
strength. To resist collapse the ends of the panel facings shall be secured to the structure (the imaginary fire
test frame in the extended application) using suspension details. Properly designed ceilings shall have both
facings mechanically fastened (see principal solutions in Appendix B) so they can not collapse before the
support structure collapse (see 5.5). The strength of these suspension details (e.g. steel cleats with
fastenings) shall be able to carry the dead loads at the temperatures they attain from an increased load of a
longer span panel. This can be achieved by increasing the amount of fixings based on the rules and
calculation method given in Annex C of this standard.
The second aspect of integrity to be assessed shall be the ability of joints between adjoining sandwich panels
to resist the passage of fire.
This can be handled by limiting the allowable deflection to be the same as the maximum deflection at failure in
the test. The rules and calculation method are given in Annex C of this standard.
To be able to do an extension in the span length there shall be an overrun of at least 20 % subject to a
minimum 10 minutes compared to the classification.
5.3.2 Variations in the panel thickness
Variations in panel thicknesses are due to changes in thickness of the core material. An increase in thickness
will lead to a better insulation value and a test result shall therefore always be valid for thicker panels. If
thicker panels are used the loadbearing capacity of the end fixings must be checked in accordance with
Annex C due to the increased load. Decrease in thickness is not allowed.
If test results for three or more thicknesses are available results for other thicknesses may be linearly
interpolated between the data points if the failure mode (insulation or integrity) is the same for all test results.
If the difference between the minimum and maximum thickness is less than 50% of the maximum thickness
two test results are enough.
Combined variations of both increase in thickness and increase in span length can not be evaluated based on
one test result only. At least test results for two different thicknesses are needed for evaluation of
temperatures and deflections needed for the calculations in Annex C. If these results are not available small
scale tests can be used to measure temperature increase for different thicknesses according to 6.1.
5.3.3 Variations in the joint construction
Even small changes in the joint construction can easily affect the integrity of the ceiling and shall not be
allowed with the following exceptions:
an increase in the overlap in the metal facing at the joint is always allowed if other dimensions remain
unchanged,
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an increase in the amount of stichings is always allowed,
tongue and groove joint in core material is allowed if tested as butted. Increase in the depth is always
allowed but no decrease. Dimension changes in thicknesses in
...
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