Bsi bs en 15254 4 2008 + a1 2011

Unknown BS EN 15254 4 2008 ICS 13 220 50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Extended application of results from fire resistance tests — Non loadbe[.]

National foreword

This British Standard is the UK implementation of

EN 15254-4:2008+A1:2011 It supersedes BS EN 15254-4:2008, which

is withdrawn

The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered

The UK participation in its preparation was entrusted to Technical Committee FSH/22, Fire resistance tests

A list of organizations represented on this committee can be obtained

on request to its secretary

This publication does not purport to include all the necessary

provisions of a contract Users are responsible for its correct

application

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard

was published under

the authority of the

Standards Policy and

NORME EUROPÉENNE

ICS 13.220.50; 91.060.10 Supersedes EN 15254-4:2008

English Version

Extended application of results from fire resistance tests - Non-

loadbearing walls - Part 4: Glazed constructions

Extension du champ d´application des résultats des essais

de résistance au feu - Eléments non-porteurs - Partie 4:

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E FÜ R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2011 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members

Ref No EN 15254-4:2008+A1:2011: E

Contents

Foreword 4



1 Scope 5



2 Normative references 5



3 Terms and definitions 5



4 Principles 7



4.1 General principles 7



4.2 Use of test evidence 7



4.2.1 General 7



4.2.2 Use of previously existing test data 7



4.2.3 Notes for Methodology in Figure 1 9



5 General rules 10



5.1 Fire performance classification 10



5.2 Combination of extended application 10



5.3 Reference test 10



6 Specific changes to the glazing system 10



6.1 Exchange of the fire resistant glass 10



6.2 Asymmetrical fire resistant glass 11



6.3 Individual rectangular glass panes: aspect ratio and increase in area 11



6.4 Individual circular, three and four side non-rectangular glass panes: Increase in area 12



6.5 Individual panes in a wall: radiation 13



6.6 Exchange of timber glazing beads 14



6.7 Exchange of metal glazing beads 14



6.8 Exchange of glazing materials 15



6.9 Bead surface coverings 15



7 Specific changes to the framing system 15



7.1 Asymmetrical framing systems 15



7.2 Exchange of frames 15



7.2.1 General 15



7.2.2 Timber frames 16



7.2.3 Metal frames 17



7.3 Frame surface coverings 18



7.4 Supporting construction and fixing of the frames 18



8 Changes to the fire resistant glazed element 18



8.1 Increase in overall dimensions and area 18



8.2 Increase in dimensions for fire resistant glazed elements: radiation 19



8.3 Replication of the fire resistant glazed element with reference to radiation 20



8.4 Changing in installation angle 20



Annex A (informative) Examples for using this standard with regard to requested extended applications based on the reference test and previously existing test data 21



A.1 Examples for glass with E Classification based on Table A.1 21



A.2 Examples for glass with EW Classification, based on Table A2 24



A.3 Examples for glass with EI Classification based on Table A3 26



Annex B (normative) Radiation calculations 28



B.1 Radiation calculations 28



B.1.1 General 28



B.1.2 Rectangular fire resistant glass panes or elements 28



B.1.3 Circular fire resistant glass panes or elements 29



B.1.4 Other shapes of Fire resistant glass panes or elements 30



Bibliography 36



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 2012, and conflicting national standards shall be withdrawn at the latest by January 2012

This document includes Amendment 1, approved by CEN on 2011-05-21

This document supersedes EN 15254-4:2008

The start and finish of text introduced or altered by amendment is indicated in the text by tags ! " Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights

According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

1 Scope

This European Standard provides guidance and, where appropriate, defines procedures for variations

of certain parameters and factors associated with the design of fire resistant glazed elements which have been tested in accordance with EN 1364-1, and classified according to EN 13501-2

Extended application of fire resistant glazed elements shall be based on test evidence

This standard only applies to vertically installed fire resistant glazed elements

This standard does not apply to doorsets and openable windows according to EN 1634-1

Glass block assemblies and paver units and channel-shaped glass as defined in EN 1051-1 and

EN 572-7 are excluded There is currently insufficient information available to enable rules for extended application to be developed for these products

NOTE Some partition walls use a combination of fire resistant glass, non-translucent and other opaque products The extended application in this case only covers the glass when it replaces these products – see clause 8.2

2 Normative references

The following referenced documents are indispensable for the application 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 357:2004, Glass in building — Fire resistant glazed elements with transparent or translucent glass

products — Classification of fire resistance

EN 1363-1:1999, Fire resistance tests — Part 1: General requirements

EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures

EN 1364-1, Fire resistance tests for non-loadbearing elements — Part 1: Walls

EN 1995-1-2, Eurocode 5: Design of timber structures — Part 1-2: General — Structural fire design

EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification

using data from fire resistance tests, excluding ventilation services

3 Terms and definitions

For the purposes of this document the terms and definitions given in EN 357:2004 and EN 13501-2, together with the following apply

3.1

fire resistant glass

!glass product group (see 3.8), i.e monolithic, multiple layers or insulating glass unit, that when used in a fire resistant glazed assembly, can have its performance determined and classified in accordance with EN 13501-2"

NOTE 1 The glass can be classified for the purposes of CE marking according to the glass product group determined by the glass manufacturer and tested as a virtual assembly Classification of fire resistant glass is a mandated requirement within the European Community

NOTE 2 The term “insulating” when used as an insulating glass unit according to EN 1279–1, should not be confused with the term “insulation” used in EN 13501–2 classification standard for fire resistant glazed element

3.2

glazing system

fire resistant glass and glazing materials used in the fire resistance test to glaze the glass into its

framing system, e.g glazing strips, beads and bead fixings, setting blocks, gaskets, sealant (see Figure B.1)

NOTE 2 The reference test provides the main source of datato determine the following:

 fire performance classification (integrity E, integrity with radiation EW or integrity with insulation EI);

 maximum pane area and dimensions for the fire resistant glass;

 maximum dimensions of the fire resistant glazed element for each type of frame material

The reference test may also provide other data to assist in determining the following:

 permitted dimensional changes to the framing system;

 changes to the glazing system

3.6

overrun time

time of fire resistance in minutes beyond the classification time achieved in the reference test, which

is the subject of the extended application The overrun time in the reference test only applies to dimensional changes to the glass and the glazed element It does not apply to changes to the glazing beads, materials and glazing strips

3.7

previously existing test data

test data generated by fire resistance tests that have been undertaken by an accredited and/or Notified Test Laboratory in accordance with European and/or former and current national standards based on the temperature-time curve identical to the one specified in EN 1363-1 (and defined in ISO 834) Previously existing test data is acceptable even though the test may not have been carried out using the plate thermometer This data can only be used as described in this standard

NOTE Previously existing test data is acceptable provided that there has been no change to the product since this data was generated

3.8

glass product group

different fire resistant glasses combined in a group, defined and produced by the same manufacturer and described in their product description together with a complete list of all components used in the assembly

process in which the limits of the glazing and framing system are separately defined It shall be based

on the reference test and supported by previously existing test data where appropriate

3.11

fire performance classification

classification of the fire resistant glazed element in accordance with EN 13501-2 with respect to integrity E, radiation W and insulation I

NOTE In previously existing test data the fire resistance is given by time to failure (not by fire performance classification above) in terms of integrity, integrity and insulation The test data may also contain information concerning the measurement of radiation

4 Principles

4.1 General principles

Extended application is a prediction of the expected fire resistance of fire resistant glazed elements It may be based on interpolation between or extrapolation from test data The fundamental consideration shall be that the fire resistant glazed element after extension would achieve the required fire performance if it were to be tested according to EN 1364-1

The specific principles and methodology governing the extended application for fire resistant glazed elements are given in Figure 1

Fire resistant glazed elements function as an integral system in which the individual components (glass panes, glazing materials, frames and frame fixings) are combined in such a way that they are effective in meeting the defined fire resistance criteria However, in this document fire resistant glazed elements are separately characterised as the glazing system and the framing system (see Figure B.1)

4.2 Use of test evidence

4.2.1 General

The applicant for the extended application shall either be the “owner” (i.e sponsor) of all reference test and previously existing test data being submitted for the extension, or have written permission from the owner to use the submitted test evidence

4.2.2 Use of previously existing test data

Previously existing test data may be used to support extended application, for instance to evaluate the influence of a particular component (e.g glazing material) or aspect of the design (e.g direction of fire exposure) or to establish which design variations affect the performance in the most or least onerous way If this can be identified, then a reference test on the most onerous design may be undertaken If the product achieves the required classification then the other less onerous variations

The following parameters and factors are considered in this standard:

Table 1 — Parameters, Factors and Rules for glazing and framing systems and glazed

Rectangular panes Increase in pane area and aspect ratio 6.3

Circular and three- and

(non-rectangular) four-sided glass panes

Glass panes with EW classification Increase in area 6.5

Timber beads Exchange of timber species / bead fixing / bead shape

and dimensions

6.6 Metal beads Exchange of bead fixing / bead shape and dimensions 6.7

Exchange of glazing materials Gaskets/glazing strips / setting blocks 6.8

Bead surface coverings Changes or adding surface coverings 6.9

Framing system

Symmetry of the framing construction Symmetrical / asymmetrical frames 7.1

Exchange of frames (general) Type of material / junction types / edge cover 7.2.1

Timber frames Thickness / profile / timber type (char rate / density) 7.2.2

Metal frames Frame materials / sections / thickness of chamber walls 7.2.3

Frame surface covering Changes or adding frame surface coverings 7.3

Supporting construction and fixing High density, low density, rigid, flexible 7.4

Fire resistant glazed element

Glazed elements classified to E or EI Increase in dimensions / area 8.1

Glazed element classified EW Increase in dimensions / area 8.2

Replication of whole element with EW classification 8.3

Step 1 : Define the fire-resistant glazed element which is under consideration for EXAP

- e.g by detailed drawings, component description and specification

Step 2 : Characterise the fire performance limits of the Glazing System and Framing System

- e.g by reference test(s) in accordance with EN 1364-1, and where

appropriate previously existing test data 2a Glazing System

- in both height and width

Notes (1) & (2)

2b Framing System

- and measure total frame deflection

Notes (3),(4), (5)

Step 3 : Check compliance with general rules

- by reference to the general rules given in 5.1 and 5.2

Step 4 : Undertake extended application

- by reference to the specific rules given in 6, 7 and 8

Figure 1 — Methodology for determining the extended application of fire resistant glazed

elements 4.2.3 Notes for Methodology in Figure 1

1: Define glass, bead type, fixings and glazing material, etc

2: Maximum dimensions not necessarily established in the same pane (e.g maximum height, maximum width, maximum area) It is not allowed to combine dimensions from different panes

3: Frame type to be the same as step 2a (e.g material specification and fire performance) 4: Bead, fixing, glass and glazing material have to be the same as those in step 2a

5: When the fire resistant glazed element to be considered is greater than 3 m × 3 m then the fire resistance test specimen has to be a minimum of 3 m × 3 m

5 General rules

5.1 Fire performance classification

In the extended application, an increase in the classification time (e.g from 30 min to 45 min) and changes to the fire performance classification (e.g from E to EW to EI) shall not be permitted

5.2 Combination of extended application

Each extended application shall be the subject of a separate evaluation Within this application it is allowed to produce a combination of extensions provided these combinations can be substantiated by the supporting test evidence and/or previously existing test data (see Annex A for an example)

An extended application that has already been granted can be used for a new extended application provided it can be shown that the new changes do not contradict any of the principles used to establish the first extended application

NOTE For reasons of traceability all supporting documents used for any extension should be included in the EXAP report

5.3 Reference test

The basis for any extension is the reference test This test is used for the extended application and must have an overrun time according to the rules described in clause 6 and clause 8 of this standard

A reference test can be submitted for either rectangular or non rectangular panes

NOTE 1 Non rectangular glass panes do not need their own reference test if they are cut out from within the rectangular pane covered by the reference test The rectangular pane can be extended according to the rules given in this standard before cutting takes place Circular, triangular or 4 sided shapes can then be cut from within this extended rectangular size All other non irregular shapes, can only be cut from the tested original sized rectangular pane (According to the Direct Field of Application rules of EN 1364-1) These shapes cannot be further extended

NOTE 2 In the case of the reference test in which a number of glass panes of different sizes and aspect ratios have been tested in a glazed construction, the extension in any dimension or area is only applicable to a single pane For example, for a rectangular pane of height H1 = 2000 mm and width B1 = 1500 mm and another pane of height H2 = 2500 mm and width B2 = 1000 mm it is not allowed to apply an extension to a hypothetical pane of height H2 = 2500 mm and width B1 = 1500 mm because the area before extension is greater than either

of the tested panels and the aspect ratio is not equivalent to either of the tested panels

6 Specific changes to the glazing system

6.1 Exchange of the fire resistant glass

The exchange (replacement) of the glass, as tested in the reference test, for another fire resistant glass is allowed, provided that it can be demonstrated that both glasses are within the same glass product group (same manufacturer) and have at least the same or increased nominal thickness When the reference glass is being exchanged (replaced), the replacement glass (new glass) must have evidence that it achieves at least the same fire resistance classification (or equivalent fire resistance) as the reference glass (such as previously existing test data)

If the replacement glass was tested (previously existing test data) at a smaller or the same size/area

as in the reference test (before extension) then the size/area of the replacement glass cannot be changed from its tested size/area

If the replacement glass was tested at the same size/area as in the reference test (after extension) then this size/area of replacement glass can be used to replace the reference glass

If the replacement glass was tested at a larger size/area than in the reference test (after extension) then the maximum size/area of the replacement glass can be no greater than the extended size/area

of the glass as tested in the reference test

When making an exchange of one glass for a thicker glass from the same glass product group (same manufacturer), the structural stability of the whole glazed element must be maintained

NOTE When exchanging one EI glass for another EI glass the transmission/absorption values only marginally influence the fire resistance performance of the glass It is the incorporation of one or more special interlayer(s) that governs the fire resistance not the type of glass used

6.2 Asymmetrical fire resistant glass

Fire resistance test evidence shall be provided for exposure to fire from both directions unless it can

be determined which direction is the worst case If this can be established by the use of previously existing test data then only fire resistance test evidence for the worst case is required

In the absence of such test evidence the fire resistant glass shall only be used in the orientation in which it was tested

Fire resistant glass that has a surface coating on one surface is considered to be asymmetrical and therefore the above rules shall apply

NOTE To demonstrate that the fire performance classification is not affected by the direction of exposure, a reference test and/or supporting previously existing test data will be required

6.3 Individual rectangular glass panes: aspect ratio and increase in area

An increase in the glass width, height and area is only allowed provided the length of overrun time in the reference test is as shown in Table 2 below

Table 2 — Required Overrun time on rectangular glass panes

a For overrun times between 3 min and 6 min or 5 % and 10 % see explanations below (after the equations 1 to 3)

The basis for the extension is the reference test

The width or height may be increased in accordance with equations 1 or 2 respectively Where both width and height are increased the maximum extended area shall be in accordance with equation 3

where

wo , ho , Ao is the width (m), height (m) and area (m2) of the tested pane;

wext , hext , Aext is the extended width (m), height (m) and area (m2) of pane;

wmax , hmax , Amax is the maximum extended width (m), height (m) and area (m2) of pane

For the classification times 30 min, 45 min and 60 min, if the overrun time achieved in the reference test is 3 min or more but less than 6 min, all glass extensions in width, height and area can be increased according to equations 1 to 3 However, the increase in any dimension is restricted to a maximum of 50 % of the calculated increase using these equations

but less than 10 %, all glass extensions in width, height and area can be increased according to equations 1 to 3 However, the increase in any dimension is restricted to a maximum of 50 % of the calculated increase using these equations

Circular, triangular or 4 sided shapes can be cut from within the extended rectangular pane size All other non rectangular shapes, can only be cut from the original sized rectangular pane in the reference test, and cannot be extended further

extended pane dimensions defined above Additionally, a change in the aspect ratio of panes, rotation

of panes from portrait format into landscape format and vice versa, and change in area, is allowed, providing that:

different panes);

For glass where the EW classification is relevant, the criteria applying to radiation defined in 6.5 shall apply Any extension in pane area is only allowed if the requirements for radiation are still satisfied

It shall be confirmed in the extended application report that the framing system under consideration is able to support the additional weight due to the increased pane area The frame manufacturer should supply this confirmation Furthermore, all of the relevant frame junctions shall have been tested in accordance with EN 1364-1 (see also Figure 2 in 7.2.1.)

6.4 Individual circular, three and four side non-rectangular glass panes: Increase in area

If a reference test report is available for circular, triangular or 4 sided shaped glass then an increase in area may be allowed provided the length of overrun time in the reference test is as shown in Table 3 below

Table 3 — Required Overrun time on circular, three and four side non-rectangular glass panes

a For overrun times between 3 min and 6 min or 5 % and 10 % see explanation below (after equation 4)

The basis for the extension is the reference test

The area may be increased in accordance with equation 4

where

Aext is the extended area (m2) of pane;

Amax is the max extended area (m2) of pane

The extended pane shall be of the same orientation and shape as the tested pane

For the classification times 30 min/45 min/60 min, if the overrun time achieved in the reference test is

3 min or more but less than 6 min, the glass area can be increased according to equation 4 However, the increase in any dimension is restricted to a maximum of 50 % of the calculated increase using this equation

but less than 10 %, the glass area can be increased according to equation 4 However, the increase

in area is restricted to a maximum of 50 % of the calculated increase using this equation

It shall be confirmed in the extended application report that the framing system under consideration is able to support the additional weight due to the increased pane area Furthermore, all of the relevant frame junctions shall have been tested in accordance with EN 1364-1 (see also Figure 2 in 7.2.1)

6.5 Individual panes in a wall: radiation

For fire resistant glass with an EW classification the rules 6.1 to 6.4 apply together with the following

NOTE 1 For fire resistant glass with an EI classification, rules for determination of radiation do not apply

The radiation (W) shall be measured (in accordance with EN 1363-2) along the centre line at a

distance of one metre from the centre of the test specimen According to EN 13501-2, the radiation

classification shall be determined by the time for which the measured radiation W0 does not exceed

wmax as defined in Annex B

This is also applicable for the radiation value wext calculated for the pane with the extended area For extended rectangular and circular panes wext can be calculated according to the following equation

where the definition is given in Annex B

The basis for the extension is the reference test

The extension in area for EW classified glasses for all other shapes is allowed by the method described in B.1.4 which is based on the area of a rectangle prescribed around the shape The relevant calculation shall be provided in the extended application report

NOTE 2 No equations currently exist for the calculation of radiation for the extended area for non-rectangular and non-circular shapes

NOTE 3 A radiometer as described in EN 1363-2 is not designed to measure the radiation from an individual pane within a multi-paned fire resistant glazed element

NOTE 4 The given limitations in Wext may also limit the extension of the area Aext of the fire resistant glass pane according to 6.3 or 6.4 or the W-classification will be lost

6.6 Exchange of timber glazing beads

In all cases, exchange of timber species should be on the basis of density and/or comparative char rate tests (when available), calculations according to EN 1995-1-2 or reference values These shall demonstrate that the fire performance of the replacement timber bead is either the same or better than that used in the reference test

If the beads in the reference test were fixed by nails, then screw fixing of similar length and distance is permitted as an alternative However, a bead fixed by screws shall not be exchanged by a clipped or nailed bead unless this possibility has been shown to work, e.g by previously existing test data The bead height may be increased provided that increased edge cover on the glass can be demonstrated not to have a detrimental effect on its fire performance The edge cover shall remain within the limits determined by the reference test or as determined by previously existing test data A reduction of the bead height is not allowed

For EI classification of fire resistant glazed elements, exchange of the bead profile from a sloped or chamfered bead to a flat bead of the same height is allowed without further testing (see Figure B.2) For E and EW classified fire resistant glazed elements, exchange of the bead profile from a sloped or chamfered bead to a flat profile bead is not allowed unless suitably demonstrated by a reference test

or previously existing test data

Exchange of a flat bead profile to a sloped or chamfered bead profile of the same height is allowed for all fire resistant glazed elements But in this case the subsequent reduction in a bead cross section is only allowed where it can be demonstrated not to have a detrimental effect on the fire performance Previously existing test data are allowed

Reduction in bead depth is only allowed if it can be demonstrated not to have a detrimental effect on the fire performance Previously existing test data is allowed

The bead depth may be increased without restriction (see Figure B.3 item 7)

NOTE the timber bead can have a major influence on the integrity performance of a timber-glazed system incorporating fire resistant glass with an E or EW classification This is because it is possible for the timber bead

to flame under the influence of radiation immediately adjacent to the glass surface on the side away from the fire Charring of the timber also occurs at radiation intensities much less than those required to cause flaming Fire resistant glazed elements with an EI classification significantly reduce the possibility of this occurrence by reducing the transmitted radiation directly at the glazing surface to low levels

6.7 Exchange of metal glazing beads

It is not allowed to exchange the type of material used for the glazing beads

Changes in bead shape are only allowed if it can be demonstrated not to have a detrimental effect on the fire performance Previously existing test data is allowed

Clipped beads can be replaced by screw fixed or riveted beads but not vice-versa

Bead depth can be increased (see also Figure B.3, item 7)

Reductions in bead depth are only allowed if it can be demonstrated not to have a detrimental effect

on the fire performance Previously existing test data are allowed

The bead height can be increased provided that the edge cover doesn't change or the increase in edge cover can be shown, e.g by the reference test and/or by previously existing test data not to have a detrimental effect on the fire performance

6.8 Exchange of glazing materials

Except for glazing beads, exchange of one glazing material, e.g gaskets, for another is allowed But only if it can be demonstrated in the reference test and/or previously existing test data that the exchange does not have a detrimental effect on the fire performance within a comparable glazing system of the same glass product group

6.9 Bead surface coverings

Decorative surface coverings of the glazing beads may be exchanged, or added where one does not exist, provided it can be demonstrated that the covering material achieves at least Class A2 when tested according to EN 13501-1 In addition it must be shown that they do not adversely affect the fire resistance performance of the fire resistant glazed element, e.g in the case of replacement coverings that provide a contribution to insulation

If the surface covering is not Class A2 then it has to be proven in reference test data and/or previously existing test data that it does not negatively affect the fire performance

Any coverings on glazed elements classified EI shall be secured using only fixing method(s) proven in the reference test and/or by previously existing test data

7 Specific changes to the framing system

7.1 Asymmetrical framing systems

Fire resistance test evidence shall be provided, were required, for exposure to fire from both directions unless it can be determined which direction is the worst case If this can be established, then only fire resistance test evidence for the worst case is required

In the absence of this fire resistance test evidence, the framing system shall only be used in the direction of fire exposure as tested

NOTE To demonstrate that the fire performance classification is unaffected by the direction of exposure, a reference test and/or supporting previously existing test data will be necessary

The extension allows the addition of junction types within the frame provided that it can be demonstrated by the reference test and/or from previously existing test data that the new junctions do not negatively affect the fire resistance

Some possible junction types are shown in Figure 2 below

Type A: four panes coming together at one point;

Type B: three panes coming together at one point, including a full height vertical pane;

Type C: three panes coming together at one point, including a full width horizontal pane;

Type D: two panes, side by side, all panes in full size vertical (mullion) or horizontal (transom);

Type E: corner junction

Figure 2 — Examples of possible junction types

The edge cover shall remain within the limits determined by fire test evidence unless supported by previously existing test data

The maximum glass pane area separately established in 6.3 to 6.5 shall not be exceeded in the extended fire resistant glazed element

The fire resistant glass shall be from the same glass product group as that used in the reference test

7.2.2 Timber frames

In addition to the general rules given in 7.2.1 the following additional rules apply for timber frames Exchange of the type of timber species used for the frame is allowed for fire resistant glass from the same glass product group as follows:

 Increased thickness of frame

The basis is the reference test together with data on the basis of density and/or comparative char rate tests (when available), calculations according to EN 1995-1-2 or reference values for the replacement timber type and its density

Laminated timber frames shall only be used if it has been proven in a fire test according to

EN 1364-1, or previously existing test data evidence may be used

Split timber frames (bolted, glued or nailed) shall be tested unless scaled drawings and representative frame sections can show that there is sufficient timber in the section such that the char line in the required period does not reach the bead fixings Char data for the timber in question shall be provided

to establish this point At least one test to EN 1364-1 is also required or previously existing test data evidence can be used

7.2.3 Metal frames

In addition to the general rules given in 7.2.1 the following additional rules apply for steel and aluminium frames

Exchange of steel for steel frames, or aluminium for aluminium frames is allowed provided that:

a) Substitute frame has the same material specification as that in the reference test as demonstrated

by the appropriate characteristics of the frame (e.g thermal expansion, thermal conductivity, melting point, strength) The specifications of the two framing systems shall be included in the extended application report for comparison

b) Substitute frame has the same fire performance as the frame in the reference test This shall be demonstrated by reference to fire test data at the same classification time Previously existing test data may be used

c) Deflection of the frame that is being considered in the extended application shall be no more than the measured deflection in the reference test The deflection of this frame must either be known from previously existing test data or by theoretical calculation If this data is not available or it is not possible to accurately calculate the deflection, then exchange is not allowed

d) Alternative frame has successful test evidence, which demonstrates that all the necessary design features (e.g junctions, fixings) of the fire resistant glazed element under consideration can be constructed with the alternative frame without impairing the required fire performance in a test of the fire resistant glazed element Previously existing test data may be used

e) In particular, the test report shall include information on expansion joints if these are to be covered by the extended application

f) Frame section may be changed provided that it can be demonstrated that:

increased in the cold state;

7.3 Frame surface coverings

Decorative surface coverings of the framing members may be exchanged, or added where one does not exist, provided it can be demonstrated that the covering material achieves at least Class A2 when classified according to EN 13501-1 In addition it must be shown that they do not adversely affect the fire performance of the fire resistant glazed element, e.g in the case of replacement of coverings that provide a contribution to insulation performance

If the surface covering is not Class A2 then it shall be proven by reference test data and/or previously existing test data that it does not negatively affect the fire performance

Any coverings on glazed elements classified EI shall only be secured using fixing methods that do not impair the fire performance of the element as proven by reference test data and/or previously existing test data

7.4 Supporting construction and fixing of the frames

For the reference test in one of the standard supporting constructions (according to EN 1363-1:1999 Section 7.2), extended application may be allowed for any other supporting construction within the same type (e.g high density rigid or low density rigid or flexible) and has the same or higher fire resistance classification But the fixing system used shall be proven by the reference test and/or by previously existing test data

8 Changes to the fire resistant glazed element

8.1 Increase in overall dimensions and area

An increase in width, height and area is only allowed provided the length of overrun time is as shown

in Table 4 below

Table 4 — Required Overrun time on glazed elements

a Overrun times between 3 min and 6 min or 5 % and 10 % see explanation below (after the equations 6 to 8)

The basis for the extension is the reference test

The width or height can be increased in accordance with equations 6 or 7 respectively Where both width and height are increased the maximum extended area shall be in accordance with equation 8