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
Current Stage
4098 - Decision to abandon - Enquiry
Due Date
15-Sep-2010
Completion Date
15-Sep-2010

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SLOVENSKI STANDARD
oSIST prEN 15254-7:2009
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
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
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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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oSIST prEN 15254-7:2009
prEN 15254-7:2009 (E)
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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oSIST prEN 15254-7:2009
prEN 15254-7:2009 (E)
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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oSIST prEN 15254-7:2009
prEN 15254-7:2009 (E)
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
F the design value for the fastener at normal temperature
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

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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prEN 15254-7:2009 (E)
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:

 for PCS value 0 to 4 MJ/m . The results are valid for all adhesives when PCS value stays between 0 and

4 MJ/m .

 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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prEN 15254-7:2009 (E)

 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-

insulation value. The results are always valid for an increase in density in the density range 50 kg/m to 150

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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prEN 15254-7:2009 (E)
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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