EN 492:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fibre-cement slates and fittings - Product specification and test methodsArdoises en fibres-ciment et leurs accessoires en fibres-ciment - Spécification du produit et méthodes d'essaiFaserzement-Dachplatten und dazugehörige Formteile - Produktspezifikation und PrüfverfahrenTa slovenski standard je istoveten z:EN 492:2004SIST EN 492:2005en91.100.4091.060.20ICS:SIST EN 492:1998/AC:2000SIST EN 492:1998/A1:2000SIST EN 492:19981DGRPHãþDSLOVENSKI
STANDARDSIST EN 492:200501-marec-2005

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 492
December 2004 ICS 91.100.40
Supersedes EN 492:1994
English version
Fibre-cement slates and fittings - Product specification and test methods
Ardoises en fibres-ciment et leurs accessoires en fibres-ciment - Spécification du produit et méthodes d'essai
Faserzement-Dachplatten und dazugehörige Formteile - Produktspezifikation und Prüfverfahren This European Standard was approved by CEN on 3 March 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1050 Brussels © 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 492:2004: E

Consignment inspection sampling.25 Annex B (normative)
Statistical method for determining the corresponding wet values or revised dry specifications for the bending moment when carrying out the dry method of test for quality control purposes.26 B.1 Procedure.26 B.2 Determination of the correlation between the results of testing wet and dry specimens.26 B.3 Determination of the regression line.27 B.4 Determination of a value for wet testing from an obtained value for dry testing.27 B.5 Determination of the minimum value specified for dry testing xstd corresponding to the minimum value specified for wet testing in this standard ystd.28 Annex C (informative)
Examples.30 C.1 Examples of dimension h.30 C.2 Examples of fibre-cement slates installed showing lines of fixing.31 Annex D (normative)
Requirements of Decision 2001/671/EC as regards the external fire performance of roof coverings.33 Annex ZA (informative)
Clauses of this European Standard addressing the provisions of the EU Construction Products Directive.34 ZA.1 Scope and relevant characteristics.34 ZA.2 Procedure for the attestation of conformity of fibre cement slates and fittings.36 ZA.2.1 Systems of attestation of conformity.36 ZA.2.2 EC Declaration of conformity.38 ZA.3 CE marking.39 Annex ZB (informative)
Survey of legislation relating to EC Directive 76/769/EEC.41 Bibliography.48

1 Scope This document specifies the technical requirements and establishes methods of control and test as well as acceptance conditions for fibre-cement slates and their fibre-cement fittings for one or more of the following uses: - roofing, - internal wall finishes, - external wall and ceiling finishes. It applies to fibre-cement slates with a height dimension h (see Clause 4) not exceeding 850 mm for overlapping assembly. For the purpose of this standard, fibre-cement slates have been classified according to their bending moment. This document covers fibre-cement slates reinforced with fibres of different types as specified in 5.1.1. This standard does not include calculations with regard to works, design requirements, installation techniques, wind uplift or rain proofing of the installed products. 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 197-1, Cement – Part 1: Composition, specifications and conformity criteria for common cements. ENV 1187:2002, Test methods for external fire exposure to roofs. EN 13501-1, Fire classification of construction products and building elements - Part 1: Classification using test data from reaction to fire test. ISO 390, Products in fibre-reinforced cement - Sampling and inspection. ISO 2602, Statistical interpretation of test results - Estimation of the mean - Confidence interval. ISO 2859-1, Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection. ISO 3951, Sampling procedures and charts for inspection by variables for percent non-conforming. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 acceptance test test to establish whether a batch of products conforms to a specification. The test is performed on samples drawn either from continuous production or from a consignment

2. One of the coefficients of the regression line (Annex B) d Apparent density of the fibre-cement slate in grams per cubic centimetre e Thickness of the fibre-cement slate in millimetres F Load at rupture in newtons h Dimension of the fibre-cement slate measured perpendicular to the line of fixing which is at or nearest to the horizontal plane of the roof (see Annex C, Figures C.1 and C.2), in millimetres
ls Span between the centres of the test machine supports in the bending moment test in millimetres
m Mass of the specimen after drying in grams M Bending moment at rupture in newton metres per metre Mfi Bending moment (average of both directions) at rupture of the specimen from the ith pair tested after the type test (second lot) in newton metres per metre Mfci Bending moment (average of both directions) at rupture of the specimen from the ith pair tested for reference in the type test (first lot) in newton metres per metre

xstd Minimum value to be used as the specification for the dry method of test. This value is calculated at the 97,5% lower confidence level from the value ystd specified for the wet method of test in this document yo Value calculated from the value obtained from a specimen tested dry, which is the estimate at the 97,5% lower confidence level of the value expected from a specimen tested wet ystd Minimum value specified in the standard for wet testing. 5 Product requirements 5.1 General 5.1.1 Composition Fibre-cement slates and fittings shall consist essentially of cement or a calcium silicate formed by chemical reaction of a siliceous and a calcareous material, reinforced by fibres. The cement shall comply with EN 197-1 or with technical specifications relevant in the country of use. Two types of fibre-reinforced cement slates and fittings are included in this standard: - Type AT (Asbestos Technology) for products the formulation of which contains chrysotile asbestos, - Type NT (Non-asbestos Technology) for products reinforced by other fibres and not containing asbestos. The reinforcing fibres shall be one or more of the following forms:  discrete elements randomly dispersed,  continuous strands or tapes,  nets or webs. Process aids, fillers and pigments which are compatible with the composite may be added. 5.1.2 Appearance and finish The exposed face of the fibre-cement slates may be with or without texture. The fibre-cement slates may be coloured or left in their natural colour. The fibre-cement slates may also receive adherent coloured or uncoloured coatings on their surface. The fibre-cement slates may be supplied with holes for fixing.

The following special classes are also available: Class AS: For mild climatic conditions lower bending moments than above are permissible for fibre-cement slates of h ≤ 450 mm with a minimum equivalent to the numerical value of h/20; Class BS: When higher bending moments are required for batten spacings ≥ 250 mm, the required minimum should be equivalent to the numerical value of h/5. NOTE 2 All classes are suitable for laying on three or more battens or directly onto a continuous rigid roof surface but only Classes B and BS are suitable for laying on two battens. NOTE 3 For cladding applications of fibre-cement slates, Class A is sufficient. a
e being the arithmetic mean of four measurements (according to 7.2.4).
5.3.4 Water impermeability When tested in accordance with 7.3.3, traces of moisture may appear on the under surface of the fibre-cement slate, but in no instance shall there be any formation of drops of water. 5.4 Durability requirements 5.4.1 General Mechanical and material properties are normally determined for as delivered products. The results shall be identified as applying to coated or uncoated material. Performance of the coating in the tests specified in 5.4.2 and 5.4.3 shall not be considered in the assessment of the product. 5.4.2 Freeze-thaw When tested in accordance with 7.4.1, after 100 freeze-thaw cycles the ratio RL as defined in 7.4.1.4 shall be not less than 0,75.

 class (see Table 1);
 length and width; c) minimum apparent density; d) information relevant to the handling and installation. 6 Evaluation of conformity 6.1 General The conformity of products with the requirements of this standard shall be demonstrated by:  initial type testing; and  factory production control by the manufacturer. 6.2 Type testing 6.2.1 General Type tests shall be carried out on products as delivered. If several formats or sizes of the same nominal thickness are being produced from the same composition and by the same production method, type tests only need to be carried out on one size of each nominal thickness. All characteristics listed in Table 2 shall be subject to initial type testing, except reaction to fire Class A1 without testing and external fire performance “deemed to satisfy” products. 6.2.2 Initial type testing Initial type testing shall be performed to demonstrate conformity to this standard. Tests previously performed in accordance with the provisions of this standard (same product, same characteristic(s), test method, sampling procedure, same attestation of conformity, etc.) may be taken into account. In addition, initial type testing shall be performed for the approval of a new product, or a fundamental change in formulation or method of manufacture, the effects of which cannot be predicted on the basis of previous experience. The results of all type tests shall be recorded and held by the manufacturer for at least 5 years. 6.2.3 Further type testing Whenever a change occurs in the fibre-cement slate design, the raw material or supplier of components, or the production process, which would change significantly one or more of the characteristics, the type test shall be performed for the appropriate characteristic(s).

Requirement Assessment method Number of samples Compliance criteria Mechanical resistance (slates) 5.3.3 7.3.2 Inspection S3 as per ISO 390 5.3.3 Table 1 apply 4% AQL Density (slates) 5.3.2 7.3.1 7.3.1 5.3.2 and 7.3.1 External fire performance (slates) 5.5.1 7.5.1 7.5.1 7.5.1 Reaction to fire (slates and fittings) 5.5.2 7.5.2 7.5.2 7.5.2 Water impermeability (slates) 5.3.4 7.3.3 3 test slates 5.3.4 Dimensional variations (slates and fittings) 5.2 7.2 Inspection S3 as per ISO 390 5.2.2 and 5.2.3 Release of dangerous substances (slates and fittings) 5.5.3 5.5.3 - 5.5.3 Warm water (slates) 5.4.4 7.3.4 10 samples 5.4.4 and 7.3.4.4 Soak/Dry (slates) 5.4.5 7.3.5 10 samples 5.4.5 and 7.3.5.4 Freeze-Thaw (slates) 5.4.2 7.4.1 10 samples 5.4.2 and 7.4.1.4 Heat-Rain (slates) 5.4.3 7.4.2 11 samples 5.4.3 and 7.4.2.4
6.3 Factory Production Control (FPC) 6.3.1 General The manufacturer shall establish, document and maintain a FPC system to ensure that the products placed on the market conform with the stated performance characteristics. The FPC system shall consist of procedures, regular inspections and tests and/or assessments and the use of the results to control raw and other incoming materials or components, equipment, the production process and the product. A manufacturer who has established a Quality Management System according to EN ISO 9001 is considered to satisfy the above requirements. The results of inspections, tests or assessments requiring action shall be recorded, as shall the action(s) taken. 6.3.2 Acceptance tests The specifications of acceptance tests apply to the product as delivered, but may be carried out at an earlier stage of maturity. Sampling from continuous production testing  on the base sheet prior to coating,  in conditions other than in Table 4,

Length Width Thickness ISO 2859-1 Inspection by attribute Double sampling AQL 4% Level S1 Apparent density Bending moment ISO 3951 Inspection by variable; method s or σ AQL 4% Level S3 Fittings
Length Width Thickness The same as for the dimensional characteristics of fibre-cement slates
6.3.3 Equipment All weighing, measuring and testing equipment shall be calibrated and regularly inspected according to documented procedures, frequencies and criteria. 6.3.4 Raw materials and components The specification of all incoming raw materials and components shall be documented, as shall the inspection scheme for ensuring conformity.
6.3.5 Product testing and evaluation The manufacturer shall establish procedures to ensure that the stated values of all of the characteristics are maintained.

7.2.4 Expression and interpretation of results 7.2.4.1 Length and width Each value shall comply with the tolerance specified in 5.2.3. 7.2.4.2 Thickness The average of the four measurements shall be not less than the minimum given in Table 1 and shall comply with the tolerances specified in 5.2.3.

In the case of immersion in water, the test specimen shall be saturated in water beforehand. Determine the mass m of the specimen after drying it in a ventilated oven maintained at 100 °C to 105 °C for 24 h. 7.3.1.4 Expression and interpretation of results
The apparent density is given by the formula: Vmd= where: d is the apparent density in grams per cubic centimetres;
m
is the mass of the test specimen after drying in grams; V is the volume of the test specimen in cubic centimetres.
The result shall conform to the specification of 5.3.2. 7.3.2 Mechanical characteristics: Breaking load test 7.3.2.1 Preparation of specimens The dimensions of the test specimen shall be large enough to ensure that it overlaps each test support by at least 10% of the span when tested in each direction.
The specimen can be square or rectangular. Testing shall be carried out after wet conditioning except that for quality control purposes dry testing can be carried out providing it is statistically established (see Annex B) that compliance with the requirements for wet testing given in Table 1 is ensured. Specimens shall be conditioned in accordance with Table 4.

7.3.2.2 Apparatus A bending test machine with a constant rate of deflection when applying the load (where this facility is not available a constant rate of loading is acceptable) and with an error of accuracy and an error of reproducibility equal to or less than 3% comprising (see Figure 1). Two parallel supports (one fixed), set in the same horizontal plane. The upper face of each support shall be rounded with a radius between 3 mm and 25 mm. The distance ls between the supports (span) shall be 200 mm except where the specimen dimension is too small to allow an overlap of each test support by at least 10% in which case the distance between the supports can be reduced to meet this overlap criteria. A loading bar having the same radius as the supports and located parallel and equidistant from them. It shall be attached to the loading mechanism by means of a flexible joint. 3 mm ≤ r < 25 mmFigure 1 — Bending test machine

7.3.2.4 Expression and interpretation of results The bending moment at rupture for each direction is given by the formula: blFMS××=4 where
M is the bending moment at rupture in newton metres per metre; F is the load at rupture, in newtons; ls is the span between the centres of the supports, in millimetres; b is the dimension of the specimen (length or width) measured parallel to the supports, in millimetres.

Fill the tube with water to a height of approximately 250 mm, measured from the upper surface of the test specimen. Leave for 24 h in an ambient atmosphere. Examine the underface of the test piece after 24 h. 7.3.3.4 Expression and interpretation of results After visual assessment the result shall conform to the specification of 5.3.4. 7.3.4 Warm water 7.3.4.1 Preparation of specimens Sample 10 fibre-cement slates as delivered. Cut 10 pairs of specimens to suit the bending test in 7.3.2. Both specimens of a pair shall be cut from the same fibre-cement slate and each given the same number for later comparison of results. 7.3.4.2 Apparatus 7.3.4.2.1 A water bath with a temperature control at (60 ± 2) °C; 7.3.4.2.2 A bending test machine, as described in 7.3.2.2.

is the bending moment at rupture of the specimen from the ith pair tested after warm water immersion (the second lot); Mfci is the bending moment at rupture of the specimen from the ith pair tested for reference (the first lot). Calculate the average, R, and standard deviation, s, of the individual ratios, Ri. Calculate the lower estimation, RL, of the mean of the ratios at 95% confidence level as follows (ISO 2602): sRR58,0L−= The result shall conform to the specification of 5.4.4. 7.3.5 Soak-dry 7.3.5.1 Preparation of specimens Sample 10 fibre-cement slates as delivered. Cut 10 sets of paired specimens to suit the bending test in 7.3.2. Both specimens of a pair shall be cut from the same fibre-cement slate and given the same number for later comparison of results. 7.3.5.2 Apparatus 7.3.5.2.1 A ventilated oven with temperature control to (60 ± 5) °C and a relative humidity of < 20% with full load of specimens. The 20% humidity shall be achieved for at least 3 h prior to the conclusion of the 6 hours drying. 7.3.5.2.2 A bath filled with water at ambient temperature (> 5 °C). 7.3.5.2.3 A bending test machine as described in 7.3.2.2.
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