Slate and stone for discontinuous roofing and external cladding - Part 1: Specifications for slate and carbonate slate

This European Standard specifies requirements for slate and carbonate slate for discontinuous roofing and external cladding, as defined in 3.1, and 3.2, used for assembly into discontinuous roofing and external cladding.
For the purposes of this European Standard, slates and carbonate slates have been classified.
This European Standard does not apply to products for roofing or external cladding made from the following:
a)   stone other than those defined in 3.1 and 3.2;
b)   concrete;
c)   polymeric materials;
d)   fibre reinforced cement;
e)   metal;
f)   clay.
This European Standard is not applicable to roofing and cladding slates used internally.
This European Standard is not applicable to bonded cladding (cladding fixed with adhesives) and cladding fixed with dowels and cramps.
NOTE 1   Requirements for internal wall lining slate are specified in EN 1469.
This document does not include requirements for appearance.
NOTE 2   Some general guidance for appearance is given in Annex A.
This European Standard does not include installation rules for slates.
NOTE 3   References to national recommendations on methods of construction for slate roofs are given in Annex C.
NOTE 4   Where the term "slate" is used in this document it means slate and carbonate slate unless otherwise indicated.

Schiefer und Naturstein für überlappende Dachdeckungen und Außenwandbekleidungen - Teil 1: Spezifikationen für Schiefer und carbonathaltige Schiefer

Diese Europäische Norm legt Anforderungen an Schiefer und carbonathaltigen Schiefer für überlappende Dachdeckungen und Außenwandbekleidungen fest, die in 3.1 und 3.2 definiert sind und die für die überlappende Verlegung und zur Außenwandbekleidung verwendet werden.
Für die Anwendung dieser Europäischen Norm wurden Schiefer und carbonathaltige Schiefer klassifiziert.
Diese Europäische Norm gilt nicht für Produkte für Dachdeckungen oder Außenwandbekleidungen, die aus den folgenden Baustoffen bestehen:
a)   Gesteine außerhalb der Definitionen in 3.1 und 3.2;
b)   Beton;
c)   Polymerwerkstoffe;
d)   Faserzement;
e)   Metall;
f)   Ton.
Diese Europäische Norm gilt nicht für Dach  und Wandschiefer für die Verwendung in Innenräumen.
Diese Europäische Norm gilt nicht für geklebte Bekleidungen (mit Klebstoff befestigte Bekleidungen) und mit Dübeln oder Klammern befestigte Bekleidungen.
ANMERKUNG 1   Anforderungen an Schiefer für Innenwandbekleidungen sind in EN 1469 festgelegt.
Dieses Dokument enthält keine Anforderungen an das Aussehen.
ANMERKUNG 2   Einige allgemeine Leitlinien zum Aussehen sind in Anhang A angegeben.
Diese Europäische Norm enthält keine Einbauanleitung für Schiefer.
ANMERKUNG 3   Verweisungen auf nationale Empfehlungen zu Konstruktionsverfahren für Schieferdächer sind in Anhang C angegeben.
ANMERKUNG 4   Die Benennung "Schiefer" bezieht sich in diesem Dokument, falls nicht anders angegeben, auf Schiefer und carbonathaltige Schiefer.

Ardoises et pierres pour toiture et bardage extérieur pour pose en discontinu - Partie 1: Spécifications pour ardoises et ardoises carbonatées

La présente Norme européenne spécifie les exigences relatives aux ardoises et ardoises carbonatées pour toiture et bardage extérieur pour pose en discontinu, telles que définies en 3.1 et 3.2, utilisées pour la toiture et le bardage extérieur pour pose en discontinu.
Pour les besoins de la présente Norme européenne, les ardoises et ardoises carbonatées ont été classées.
La présente Norme européenne ne s'applique pas aux produits de toiture ou de bardage extérieur fabriqués dans les matériaux suivants :
a)   les pierres autres que celles définies en 3.1 et 3.2 ;
b)   le béton ;
c)   les matériaux polymères ;
d)   le ciment renforcé par des fibres ;
e)   le métal ;
f)   l'argile.
La présente Norme européenne n'est pas applicable aux ardoises pour la toiture et le bardage en intérieur.
La présente Norme européenne n'est pas applicable au bardage renforcé (bardage fixé par des adhésifs) et au bardage fixé par des goujons et des crampons.
NOTE 1   Les exigences relatives aux ardoises utilisées en revêtement mural sont spécifiées dans l'EN 1469.
Le présent document ne comprend pas d'exigences relatives à l'aspect.
NOTE 2   Des informations générales sur l'aspect des ardoises figurent à l'Annexe A.
La présente Norme européenne ne comprend pas de règles d'installation relatives aux ardoises.
NOTE 3   Des références à des recommandations nationales sur les méthodes de construction des toitures en ardoise figurent dans l'Annexe C.
NOTE 4   Sauf indication contraire, lorsque le terme « ardoises » est utilisé dans le présent document, il désigne les ardoises et les ardoises carbonatées.

Skrilavec in naravni kamen za pokrivanje streh in oblaganje zunanjih zidov - 1. del: Specifikacije za skrilavce in karbonatne skrilavce

Standard EN 12326-1 določa zahteve za skrilavce in karbonatne skrilavce pri pokrivanju streh in oblaganju zunanjih zidov, kot je določeno v točkah 3.1 in 3.2, kadar so uporabljeni kot sestavni deli pri pokrivanju streh in oblaganju zunanjih zidov. Za namene tega evropskega standarda so bili skrilavci in karbonatni skrilavci razdeljeni v razrede. Ta evropski standard ne velja za izdelke za pokrivanje streh ali oblaganje zunanjih zidov, ki so izdelani iz: a) kamna, ki ni kamen iz točk 3.1 in 3.2; b) betona; c) polimernih materialov; d) z vlakni ojačanega cementa; e) kovine; f) opeke. Ta evropski standard ne velja za skrilavce, ki se uporabljajo pri pokrivanju notranjih streh in oblaganju notranjih zidov. Ta evropski standard ne velja za vezno oblaganje zidov (oblaganje, ojačano z lepili) in oblaganje, ojačano s centirnimi zatiči in sponkami.

General Information

Status
Published
Publication Date
26-Aug-2014
Current Stage
9093 - Decision to confirm - Review Enquiry
Due Date
03-Mar-2020
Completion Date
11-Jun-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Skrilavec in naravni kamen za pokrivanje streh in oblaganje zunanjih zidov - 1. del: Specifikacije za skrilavce in karbonatne skrilavceSchiefer und Naturstein für überlappende Dachdeckungen und Außendwandbekleidungen - Teil 1: Spezifikation für Schiefer und carbonathaltige SchieferArdoises et pierres pour toiture et bardage extérieur pour pose en discontinu - Partie 1: Spécifications pour ardoises et ardoises carbonatéesSlate and stone for discontinuous roofing and external cladding - Part 1: Specifications for slate and carbonate slate91.100.15Mineralni materiali in izdelkiMineral materials and products91.060.20StreheRoofs91.060.10Stene. Predelne stene. FasadeWalls. Partitions. FacadesICS:Ta slovenski standard je istoveten z:EN 12326-1:2014SIST EN 12326-1:2014en,fr,de01-november-2014SIST EN 12326-1:2014SLOVENSKI

STANDARDSIST EN 12326-1:20041DGRPHãþD
SIST EN 12326-1:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12326-1
August 2014 ICS 91.100.15 Supersedes EN 12326-1:2004English Version

Slate and stone for discontinuous roofing and external cladding -Part 1: Specifications for slate and carbonate slate

Ardoises et pierres pour toiture et bardage extérieur pour pose en discontinu - Partie 1: Spécifications pour ardoises et ardoises carbonatées

Schiefer und Naturstein für überlappende Dachdeckungen und Außenwandbekleidungen - Teil 1: Spezifikationen für Schiefer und carbonathaltige Schiefer This European Standard was approved by CEN on 10 July 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12326-1:2014 ESIST EN 12326-1:2014

EN 12326-1:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................4 Introduction .........................................................................................................................................................5 1 Scope ......................................................................................................................................................6 2 Normative references ............................................................................................................................6 3 Terms and definitions ...........................................................................................................................7 4 Symbols and abbreviations ..................................................................................................................8 5 Requirements .........................................................................................................................................9 5.1 Origin and petrography .........................................................................................................................9 5.2 Thickness ...............................................................................................................................................9 5.2.1 General ....................................................................................................................................................9 5.2.2 Nominal thickness .................................................................................................................................9 5.2.3 Individual thickness ..............................................................................................................................9 5.3 Characteristic modulus of rupture .................................................................................................... 12 5.4 Grain ..................................................................................................................................................... 12 5.5 Water absorption ................................................................................................................................ 12 5.6 Freeze–thaw resistance (for slates with water absorption > 0,6) .................................................. 13 5.7 Thermal cycle resistance ................................................................................................................... 13 5.8 Apparent calcium carbonate content ............................................................................................... 13 5.9 Sulfur dioxide exposure test ............................................................................................................. 13 5.10 Non-carbonate carbon content ......................................................................................................... 14 5.11 Defects ................................................................................................................................................. 14 5.12 Other dimensions ............................................................................................................................... 14 5.12.1 General ................................................................................................................................................. 14 5.12.2 Deviation of length and width ............................................................................................................ 14 5.12.3 Deviation from edge straightness ..................................................................................................... 15 5.12.4 Deviation from rectangularity ............................................................................................................ 15 5.12.5 Deviation from flatness ...................................................................................................................... 15 5.12.6 Format of random slates and special shaped slates ...................................................................... 16 5.13 Fire ....................................................................................................................................................... 16 5.13.1 External fire performance .................................................................................................................. 16 5.13.2 Reaction to fire performance ............................................................................................................. 16 5.14 Release of dangerous substances .................................................................................................... 17 6 Assessment and verification of constancy of performance - AVCP ............................................. 17 6.1 General ................................................................................................................................................. 17 6.2 Number of slates required for type tests and factory production control .................................... 18 6.3 Testing frequency ............................................................................................................................... 18 6.4 Type testing ......................................................................................................................................... 20 6.4.1 General ................................................................................................................................................. 20 6.4.2 Test Reports ........................................................................................................................................ 20 6.5 Factory production control (FPC) ..................................................................................................... 20 6.5.1 General ................................................................................................................................................. 20 6.5.2 Product related requirements ............................................................................................................ 20 6.5.3 Procedures in case of nonconformity and/or complaint ................................................................ 21 7 Marking, labelling and packaging ..................................................................................................... 23 Annex A (informative)

Appearance of slates ................................................................................................. 24 SIST EN 12326-1:2014

EN 12326-1:2014 (E) 3 A.1 Colour ................................................................................................................................................... 24 A.2 Marks .................................................................................................................................................... 24 Annex B (informative)

Guidance for the calculation of the basic individual thickness of slates ............. 25 B.1 Calculation of the basic individual thickness of slates ................................................................... 25 B.2 National X factors ................................................................................................................................ 26 B.3 Example calculations for minimum thickness of slates .................................................................. 26 B.3.1 Nominal thickness ............................................................................................................................... 26 B.3.2 Examples for the calculation of nominal thickness ......................................................................... 26 Annex C (informative)

General guidance on the installation of slates ........................................................ 30 Annex D (informative)

Format for the accompanying commercial document ............................................ 31 Annex E (informative)

Method to estimate the nominal thickness of packed slates epc) .......................... 35 E.1 Principle................................................................................................................................................ 35 E.2 Apparatus ............................................................................................................................................. 35 E.3 Preparation of test pieces................................................................................................................... 35 E.4 Procedure ............................................................................................................................................. 35 E.5 Expression of results .......................................................................................................................... 35 E.6 Test report ............................................................................................................................................ 35 Annex ZA (informative)

Clauses of this European Standard addressing the provisions of the EU Construction Products Regulation .................................................................................................... 36 ZA.1 Scope and relevant characteristics ................................................................................................... 36 ZA.2 Procedure for AVCP of the slate and carbonate slate for discontinuous roofing and external cladding ................................................................................................................................. 39 ZA.2.1 Systems of AVCP ................................................................................................................................ 39 ZA.2.2 Declaration of performance (DoP) ..................................................................................................... 41 ZA.2.2.1 General .......................................................................................................................................... 41 ZA.2.2.2 Content.......................................................................................................................................... 42 ZA.2.2.3 Example of DoP ............................................................................................................................ 43 ZA.3 CE marking marking and labelling .................................................................................................... 45 Bibliography ...................................................................................................................................................... 47

SIST EN 12326-1:2014

EN 12326-1:2014 (E) 4 Foreword This document (EN 12326-1:2014) has been prepared by Technical Committee CEN/TC 128 “Roof covering products for discontinuous laying and products for wall cladding”, the secretariat of which is held by NBN. 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 February 2015 and conflicting national standards shall be withdrawn at the latest by May 2016. 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. This document supersedes EN 12326-1:2004. 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 the EU Construction Products Regulation. For relationship with EU Directive(s) and the Construction Products Regulation, see informative Annex ZA, which is an integral part of this document. In comparison to the previous edition, the following sections have been modified: 3.1, 3.2, 3.3, 3.13, 5.1, 5.2.3, 5.3, 5.5, 5.6, 5.8, 5.9, 5.12.1, 5.12.5, 5.13, 5.14, Clause 6, Annex B, Annex C, Annex D, Annex E and Annex ZA. This European Standard EN 12326-1 is one of a series of product standards for building materials. EN 12326 consists of the following parts:  Part 1: Specifications for slate and carbonate slate;  Part 2: Methods of test for slate and carbonate slate. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12326-1:2014

EN 12326-1:2014 (E) 5 Introduction The evaluation of the performance of the products has been defined, as far as possible, in terms of a number of type tests. A distinction has been made between product appraisal (type test) and routine factory production control requirements. The performance of a roof or wall constructed with these products depends not only on the properties of the product as required by this document, but also on the design, construction and performance of the roof or wall as a whole in relation to the environment and conditions of use. SIST EN 12326-1:2014

EN 12326-1:2014 (E) 6 1 Scope This European Standard specifies requirements for slate and carbonate slate for discontinuous roofing and external cladding, as defined in 3.1, and 3.2, used for assembly into discontinuous roofing and external cladding. For the purposes of this European Standard, slates and carbonate slates have been classified. This European Standard does not apply to products for roofing or external cladding made from the following: a) stone other than those defined in 3.1 and 3.2; b) concrete; c) polymeric materials; d) fibre reinforced cement; e) metal; f) clay. This European Standard is not applicable to roofing and cladding slates used internally. This European Standard is not applicable to bonded cladding (cladding fixed with adhesives) and cladding fixed with dowels and cramps. NOTE 1 Requirements for internal wall lining slate are specified in EN 1469. This document does not include requirements for appearance. NOTE 2 Some general guidance for appearance is given in Annex A. This European Standard does not include installation rules for slates. NOTE 3 References to national recommendations on methods of construction for slate roofs are given in Annex C. NOTE 4 Where the term “slate” is used in this document it means slate and carbonate slate unless otherwise indicated. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12326-2:2011, Slate and stone for discontinuous roofing and external cladding — Part 2: Methods of test for slate and carbonate slate EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from reaction to fire tests ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection SIST EN 12326-1:2014

EN 12326-1:2014 (E) 7 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 slate rock originating from clayey sedimentary rocks, including sediments of volcanoclastic origin and belonging petrographically to a range which begins at the boundary between sedimentary and metamorphic formation and ends at the epizonal-metamorphic phyllite formations

Note 1 to entry: The predominant and most important components are the phyllosilicates and the cleavage resulting froma schistosity flux, caused by low or very low grade of metamorphism. Note 2 to entry: Slate is distinguished from sedimentary stones, which invariably splits along a bedding or sedimentation plane. Note 3 to entry: The origin of the metamorphism can be due to tectonic or lithostatic compression or a combination of the two. 3.2 roofing slate slate used for roofing and external cladding, which easily splits into thin sheets along a plane of cleavage 3.3 carbonate slate rock used for roofing and external cladding, containing phyllosilicates and a minimum apparent calcium carbonate content of 20 % and exhibiting a prominent slaty cleavage 3.4 vein separately identifiable band of slate rock within the geological formation of a quarry or mine 3.5 slate vein localized occurrence (in a roofing or external cladding slate), usually passing through the thickness of a slate, of minerals that have intruded or infiltrated into a joint or fissure in the parent rock 3.6 grain orientation of the minerals in slate which results in an anisotropic bending strength Note 1 to entry: In the bending strength test, grain is perpendicular to the load bar in the test that usually gives the highest failure result. 3.7 rectangular slate slate which is square or rectangular including such slates which have been shouldered 3.8 shouldering removal of the upper (when installed) corner(s) of a roofing or external cladding slate to facilitate laying Note 1 to entry: This description does not apply to special designs of slates. 3.9 shouldered slate slate from which the upper corners have been removed SIST EN 12326-1:2014

EN 12326-1:2014 (E) 8 3.10 type test product appraisal test concerned with one or more of the following, the effect of which cannot be anticipated on the basis of previous tests: — the operation of a new quarry, mine or vein of slate for the first time; — an unanticipated change in the geology of the rock 3.11 factory production control test test performed on samples drawn from continuous production to establish whether a lot conforms to this document 3.12 nominal thickness thickness of slates declared by the manufacturer 3.13 corrected packed thickness thickness of 100 packed slates divided by 100 and reduced by a factor depending on the flatness characteristics of the slate declared by the manufacturer Note 1 to entry: See Annex E. 3.14 basic individual thickness thickness of slates determined from the modulus of rupture, as shown in Annex B, and/or from traditional construction methods Note 1 to entry:

See Annex B and Annex C. 3.15 minimum individual thickness minimum thickness of slates determined by adjusting the basic individual thickness in accordance with 5.2.3 3.16 modulus of rupture maximum stress sustained by a slate test piece when a bending moment is applied Note 1 to entry: In this document, the arrangement of the test is three point bending. 3.17 random slates slates or sets of slates produced to undefined dimensions 4 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. AQL acceptable quality level W1, W2 codes applied to the result of the water absorption test and if relevant the freeze–thaw test b width of a slate, in mm ebi basic individual thickness of roofing slates determined from the modulus of SIST EN 12326-1:2014

EN 12326-1:2014 (E) 9 rupture and/or traditional construction methods, in mm ei individual thickness of roofing slates, in mm el thickness of a slate calculated as a function of its longitudinal modulus of rupture and the X factor, in mm emi minimum thickness of individual slates, in mm ep thickness of packed slates, in mm es depth of softening in the sulfur dioxide exposure test for slates with an apparent calcium carbonate content more than 20 %, in mm et basic thickness of a slate calculated as a function of its transverse modulus of rupture and the X factor, in mm l length, in mm Rcl characteristic longitudinal modulus of rupture, in N/mm2 Rct characteristic transverse modulus of rupture, in N/mm2 S1, S2, S3 codes applied to the result of the sulfur dioxide exposure test for slates with an apparent calcium carbonate content of less than or equal to 20 % S-3 inspection level defined in ISO 2859-1 T1, T2, T3 codes applied to the result of the thermal cycle test X nationally designated constant determined as a function of climate and/or construction techniques in (N1/2„mm-1/2) 5 Requirements 5.1 Origin and petrography A petrographic examination as specified in EN 12326-2:2011, Clause 16, shall be carried out for identification purposes and to decide whether the slate falls within the scope of this document and to establish the relationship between the bedding and the cleavage. Every slate in a consignment shall be supplied from the declared source quarry, mine or vein of slate and shall be of the declared slate type as defined in 3.1 and 3.2. 5.2 Thickness 5.2.1 General A flow chart for the control of nominal and individual thickness of slates is given in Figure 1. 5.2.2 Nominal thickness The nominal thickness of each roofing slate product, in millimetres, and the amount by which the individual thickness varies, as a percentage of the nominal thickness, shall be declared. NOTE Annex E gives a quick method for estimating the nominal thickness. 5.2.3 Individual thickness 5.2.3.1 The measurement of individual thickness shall be carried out in accordance with EN 12326-2:2011, Clause 8. The individual thickness of the slates shall not be less than 2,0 mm. SIST EN 12326-1:2014

EN 12326-1:2014 (E) 10 5.2.3.2 The minimum individual thickness of slates (emi) shall be determined as a function of their mechanical resistance — the bending strength and modulus of rupture (determined in accordance with EN 12326-2:2011, Clause 10) — and the climatic conditions or the traditional construction techniques in the country of use, increased by the appropriate value given in 5.2.3.3, 5.2.3.4 and/or 5.2.3.5. The minimum individual thickness shall be the largest value determined using any of the above factors. NOTE 1 The mechanical resistance of a slate is a function of both the inherent strength of the rock from which it is made and its thickness. Annex B provides a method of calculating the basic individual thickness (ebi). NOTE 2 The usual construction techniques can be given in national regulations or national standards for execution. A list of documents is given in Annex C. NOTE 3 Member states can explain their national rules used to determine the minimum thickness of slates in an informative national document. 5.2.3.3 The increase in the basic individual thickness of slates (ebi) with an apparent calcium carbonate content equal to or less than 20 % (determined in accordance with EN 12326-2:2011, Clause 13) shall not be less than the appropriate value shown in Table 1 for the relevant sulfur dioxide exposure code S1 or S2 in 5.9.1 (as determined in accordance with EN 12326-2:2011, 14.1). 5.2.3.4 Slates with an apparent calcium carbonate content equal to or less than 20 %, (determined in accordance with EN 12326-2:2011, Clause 13) and achieving a sulfur dioxide exposure code S3 in 5.9.1 (determined in accordance with EN 12326-2:2011, 14.1) shall have a minimum individual thickness of not less than 8,0 mm or the thickness determined in accordance with EN 12326-2:2011, 15.2, and 5.2.3.5 of this document. 5.2.3.5 The increase in basic individual thickness of slates (ebi) with an apparent calcium carbonate content more than 20 % (determined in accordance with EN 12326-2:2011, Clause 13) or of slates achieving a sulfur dioxide exposure code S3 (determined in accordance with EN 12326-2:2011, 14.1) shall not be less than the value obtained using the following formula: 20,5(7)eee=++mibis where emi

is the minimum individual thickness, in millimetres; ebi
is the basic individual thickness, in millimetres (see Annex B); es
is the thickness of the softened layer, in millimetres. SIST EN 12326-1:2014
EN 12326-1:2014 (E) 11

Figure 1 — Flow chart for the control of the nominal and individual thickness of slates SIST EN 12326-1:2014

EN 12326-1:2014 (E) 12 Table 1 — Minimum individual thickness of slates in relation to the apparent calcium carbonate content and the sulfur dioxide exposure code Apparent calcium carbonate content Sulfur dioxide exposure code determined in accordance with EN 12326–2:2011, 14.1 Depth of softened layer es determined in accordance with EN 12326–2:2011, 14.2 Formulas for thickness adjustment %

≤5,0 S1 NA a None S2 NA ebi + 5 % S3 NA ebi ≥ 8,0 mm or switch to the test in EN 12326–2:2011, 14.2 > 5,0 ≤ 20,0 S1 NA ebi + 5 % S2 NA ebi + 10 % S3 NA ebi ≥ 8,0 mm or switch to the test in EN 12326–2:2011, 14.2 > 20,0 NA 0 to 0,70 ebi + 0,50 + (7.es2) > 0,70 Not suitable for roofing or external cladding slates a Not applicable. 5.2.3.6 The variation of individual thickness shall be within the declared range, which shall not be more than ± 35 % of the nominal thickness. 5.3 Characteristic modulus of rupture The characteristic modulus of rupture, determined in accordance with EN 12326-2:2011, Clause 10, shall be declared. 5.4 Grain If the characteristic modulus of rupture, determined in accordance with EN 12326-2:2011, Clause 10, indicates different bending strengths in the longitudinal and transverse orientations, the direction of the largest value shall be declared. NOTE Grain is not always visible to the naked eye. In this case, petrographic analysis can be used to determine grain orientation. 5.5 Water absorption When tested in accordance with EN 12326-2:2011, Clause 11, slates shall be classified and declared as code W1(≤0,6), í1(>0,6) or í2 from Table 2. SIST EN 12326-1:2014

EN 12326-1:2014 (E) 13 Table 2 — Water absorption requirements Water absorption Code (%)

≤ 0,6 í1(≤0,6) > 0,6 and tested according to 5.6 W1(>0,6) > 0,6 and not tested according to 5.6 W2 5.6 Freeze–thaw resistance (for slates with water absorption > 0,6) When tested in accordance with EN 12326-2:2011, Clause 12, - the mean modulus of rupture for each orientation before and after the freeze–thaw test are reported in addition to the code W1(>0,6) from Table 2. 5.7 Thermal cycle resistance When tested in accordance with EN 12326-2:2011, Clause 15, slates shall be declared with a code according to Table 3. Table 3 — Thermal cycle requirements Code Observation in test T1 No changes in appearance Surface oxidation of metallic minerals Colour changes that neither affect the structure nor form runs of discolouration T2 Oxidation or appearance changes of the metallic inclusions with runs of discolouration but without structural changes T3 Oxidation or appearance changes of metallic m

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