SIST EN 771-6:2005
(Main)Specification for masonry units - Part 6: Natural stone masonry units
Specification for masonry units - Part 6: Natural stone masonry units
This European Standard specifies the characteristics and performance requirements of masonry units manufactured from natural stone the width of which is equal to or greater than 80 mm, for which the main intended uses are common, facing or exposed masonry units in load bearing or non-load bearing building and civil engineering applications These units are suitable for all forms of coursed or random masonry walling, including single leaf, cavity, partition, retaining and the external masonry to chimneys. They can provide fire protection, thermal insulation, sound insulation and sound absorption.
This European Standard includes natural stone masonry units of an overall non-rectangular parallelipiped shape, specially shaped and accessory units for internal and external application.
It defines the performance related to e.g. strength, petrographic description, density, porosity, dimensional accuracy, thermal conductivity, water absorption, and frost resistance and provides for the evaluation of conformity of the product to this European Standard. The marking requirements for products covered by this European Standard are also included.
This European Standard does not cover storey height panels, natural stone for paving, chimney flue linings nor units intended for use as damp proof course.
Festlegungen für Mauersteine - Teil 6: Natursteine
Diese Europaische Norm legt die Eigenschaften und Leistungsanforderungen an Mauersteine fest, die aus
Naturstein mit einer Breite !A80 mm hergestellt und vorwiegend als Normalmauersteine sowie Sicht- und
Vormauersteine in tragenden oder nichttragenden Mauerwerksbauten verwendet werden. Diese Mauersteine
eignen sich fur alle Arten von Schichtenmauerwerk oder unregelma©¬igem Mauerwerk einschlie©¬lich
einschaligen und zweischaligen Wanden, Trennwanden, Stutzwanden und Schornsteinau©¬enmauerwerk. Sie
konnen zum Brandschutz, Warmeschutz, Schallschutz und Schalldammung beitragen.
Diese Europaische Norm gilt ebenfalls fur Mauersteine aus Naturstein mit einer nicht allseitig von Rechtecken
begrenzten Form, Formsteine und Erganzungssteine fur den Innen- und Au©¬enbereich.
Sie definiert die Anforderungen z. B. an Festigkeit, petrographische Zusammensetzung, Dichte, Porositat,
Ma©¬genauigkeit, Warmeleitfahigkeit, Wasseraufnahme und Frostwiderstand und legt die
Konformitatsbewertung des Produktes fest. Die Anforderungen an die Kennzeichnung der von dieser
Europaischen Norm erfassten Produkte sind ebenfalls enthalten.
Diese Europaische Norm gilt nicht fur geschosshohe Tafeln, Natursteine fur Pflaster und fur die Auskleidung
von Rauchabzugen sowie fur Natursteine zur Herstellung feuchtesperrender Schichten.
Spécifications pour éléments de maçonnerie - Partie 6: Eléments de maçonnerie en pierre naturelle
La présente Norme européenne spécifie les caractéristiques et les exigences de performances des éléments de maçonnerie en pierre naturelle, dont la largeur ou l’épaisseur est égale ou supérieure a 80 mm, utilisés, dans les structures de maçonnerie courante ou de parement, porteuse ou non, dans des bâtiments ou des ouvrages de génie civil. Ces éléments conviennent a toutes les formes de murs de maçonnerie appareillée ou non, y compris les murs a simple et double paroi, les cloisons, les murs de soutenement et la maçonnerie extérieure de conduits de fumée. Ils peuvent constituer une protection contre les incendies, une isolation thermique ou acoustique et assurer l’absorption des bruits.
La présente Norme européenne couvre les éléments de maçonnerie en pierre naturelle n’ayant pas une forme générale de parallélépipede rectangle, notamment sur les éléments de forme particuliere et les accessoires.
Elle définit les performances relatives, par exemple, a la résistance, la description pétrographique, la masse volumique, la porosité, la précision dimensionnelle, la conductivité thermique, l’absorption d’eau et la résistance au gel et décrit l’évaluation de la conformité du produit a la présente Norme européenne. La présente Norme européenne inclut également les exigences de marquage des produits dont elle traite.
La présente Norme européenne ne couvre pas les panneaux hauteur d’étage, les pierres naturelles pour pavage, les conduits intérieurs de fumée ni les éléments destinés a etre utilisés comme barriere d’étanchéité.
Specifikacija za zidake – 6. del: Zidaki iz naravnega kamna
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 771-6:2005
01-december-2005
1DGRPHãþD
SIST EN 771-6:2002
Specifikacija za zidake – 6. del: Zidaki iz naravnega kamna
Specification for masonry units - Part 6: Natural stone masonry units
Festlegungen für Mauersteine - Teil 6: Natursteine
Spécifications pour éléments de maçonnerie - Partie 6: Eléments de maçonnerie en
pierre naturelle
Ta slovenski standard je istoveten z: EN 771-6:2005
ICS:
91.100.15
SIST EN 771-6:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 771-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2005
ICS 91.100.15 Supersedes EN 771-6:2000
English Version
Specification for masonry units - Part 6: Natural stone masonry
units
Spécification pour éléments de maçonnerie - Partie 6: Festlegungen für Mauersteine - Teil 6: Natursteine
Eléments de maçonnerie en pierre naturelle
This European Standard was approved by CEN on 16 August 2005.
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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 771-6:2005: E
worldwide for CEN national Members.
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EN 771-6:2005 (E)
Contents Page
Foreword. 3
1 Scope. 4
2 Normative references. 4
3 Terms and definitions . 5
4 Materials. 7
5 Requirements for natural stone masonry units . 7
6 Description, designation and classification of natural stone masonry units . 12
7 Marking. 13
8 Evaluation of conformity. 14
Annex A (normative) Sampling for initial type testing and for independent testing of
consignments . 17
Annex B (informative) Guidance for inspection frequencies. 19
Annex ZA (normative) Clauses of this European Standard addressing the provisions of
the Construction Products Directive. 22
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EN 771-6:2005 (E)
Foreword
This European Standard (EN 771-6:2005) has been prepared by Technical Committee CEN/TC 125
“Masonry”, the secretariat of which is held by BSI.
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 April 2006, and conflicting national standards shall
be withdrawn at the latest by July 2007.
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Construction Products Directive (89/106/EEC).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
European Standard.
It also takes into account the general rules for unreinforced and reinforced masonry in EN 1996-1-1.
This European Standard supersedes EN 771-6:2000.
EN 771, Specification for masonry units consists of:
Part 1: Clay masonry units.
Part 2: Calcium silicate masonry units.
Part 3: Aggregate concrete masonry units (dense and light-weight aggregates).
Part 4: Autoclaved aerated concrete masonry units.
Part 5: Manufactured stone masonry units.
Part 6: Natural stone masonry units.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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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EN 771-6:2005 (E)
1 Scope
This European Standard specifies the characteristics and performance requirements of masonry units
manufactured from natural stone the width of which is equal to or greater than 80 mm, for which the
main intended uses are common, facing or exposed masonry units in load bearing or non-load
bearing building and civil engineering applications These units are suitable for all forms of coursed or
random masonry walling, including single leaf, cavity, partition, retaining and the external masonry to
chimneys. They can provide fire protection, thermal insulation, sound insulation and sound absorption.
This European Standard includes natural stone masonry units of an overall non-rectangular
parallelipiped shape, specially shaped and accessory units for internal and external application.
It defines the performance related to e.g. strength, petrographic description, density, porosity,
dimensional accuracy, thermal conductivity, water absorption, and frost resistance and provides for
the evaluation of conformity of the product to this European Standard. The marking requirements for
products covered by this European Standard are also included.
This European Standard does not cover storey height panels, natural stone for paving, chimney flue
linings nor units intended for use as damp proof course.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard.
For dated references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
EN 772-1:2000, Methods of test for masonry units — Part 1: Determination of compressive strength
EN 772-11, Methods of test for masonry units - Part 11: Determination of water absorption of
aggregate concrete, manufactured stone and natural stone masonry units due to capillary action and
the initial rate of water absorption of clay masonry units
EN 772-16, Methods of test for masonry units — Part 16: Determination of dimensions
EN 772-20, Methods of test for masonry units — Part 20: Determination of flatness of faces of
masonry units
EN 998-2:2003, Specification for mortar for masonry — Part 2: Masonry mortar
EN 1052-2, Methods of test for masonry — Part 2: Determination of flexural strength
EN 1052-3, Methods of test for masonry — Part 3: Determination of initial shear strength
EN 1745, Masonry and masonry products — Methods for determining design thermal values
EN 1936, Natural stone test method — Determination of real density and apparent density and of total
and open porosity
EN 12371, Natural stone test methods — Determination of frost resistance
EN 12372, Natural stone test methods — Determination of flexural strength under concentrated load
EN 12407, Natural stone test methods — Petrographic examination
EN 12440, Natural stone — Denomination criteria
EN 12524, Building materials and products — Hygrothermal properties — Tabulated design values
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EN 771-6:2005 (E)
EN 13373, Natural stone test methods — Determination of geometric characteristics of units
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification
using test data from reaction to fire tests
EN ISO 12572, Hygrothermal performance of building materials and products — Determination of
water vapour transmission properties (ISO 12572:2001)
ISO 12491, Statistical methods for quality control of building materials and components
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
apparent density
ratio between the mass of the dry specimen and its apparent volume
3.2
masonry unit
preformed component intended for use in masonry construction
3.3
face
exposed surface of natural stone masonry units
3.4
natural stone masonry unit
masonry unit manufactured from natural stone
3.5
dimensions and surfaces
defined by reference to figure 1 relates to the name of the dimensions and surfaces for dimensioned
stone and squared rubble stone
3.6
co-ordinating size
size of the co-ordinating space allocated to a masonry unit including allowances for joints and
tolerances
3.7
work size
size of a masonry unit specified for its manufacture, to which the actual size conforms within
permissible deviations
3.8
actual size
size of a masonry unit as measured
3.9
rubble stone
masonry unit squared or not of any shape with variable dimensions, whose face is rough or worked
3.10
squared rubble stone
rubble stone which is squared and worked to dimensions declared by the manufacturer
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EN 771-6:2005 (E)
3.11
regular shaped masonry unit
masonry unit with an overall rectangular parallelepiped shape
3.12
specially shaped masonry unit
masonry unit which is not rectangular parallelepiped
3.13
accessory masonry unit
masonry unit which is shaped to provide a particular function, e.g. to complete the geometry of the
masonry
3.14
dimensioned stone
stone worked on all faces to declared dimensions
3.15
extra width
width exceeding the work size, to be adjusted to work-size width after application of the unit on site
3.16
declared value
value that a manufacturer is confident of achieving bearing in mind the precision of the test and the
variability of the manufacturing process
3.17
indicative samples
piece of natural stone of sufficient size to indicate the appearance of the finished work, regarding the
colouring, the vein pattern, the physical structure and face finish
3.18
Category I masonry units
units with a declared compressive strength with a probability of failure to reach it not exceeding 5 %;
this may be determined via the mean or characteristic value
3.19
Category II masonry units
units not intended to comply with the level of confidence of Category I units
3.20
normalised compressive strength of masonry units
compressive strength of masonry units converted to the air dry compressive strength of an equivalent
100 mm wide × 100 mm high masonry unit
3.21
mean compressive strength of masonry units
arithmetic mean of the compressive strengths of masonry units
3.22
characteristic compressive strength of masonry units
compressive strength corresponding to the 5 % fractile of the compressive strength of masonry units
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EN 771-6:2005 (E)
4 Materials
4.1 General
4.2 Materials of natural stone
Natural stone is a natural product obtained by mining or by quarrying and made into masonry units by
a manufacturing process.
The following groups of materials are considered as natural stone:
Magmatic or igneous rocks: Rocks formed by the cooling and solidification of the magma, e.g.
granite, basalt, diorite, porphyry.
Sedimentary rocks: Rocks formed by deposition (generally in water) and consolidation of
organic or inorganic particles. For example limestone, sandstone, travertine.
Metamorphic rocks: Transformed rocks resulting from action of heat and/or pressure on the pre-
existing rocks. For example slate, gneiss, quartzite, marble.
5 Requirements for natural stone masonry units
5.1 General
The requirements and properties specified in this European Standard shall be defined in terms of the
test methods and other procedures referred to in this European Standard.
It should be noted that the test methods are not always applicable to specially shaped and accessory
units as defined in 3.9 and 3.10.
The conformity criteria given in the following subclauses relate to initial type tests (see 8.2) and to
consignment testing (see Annex A). For the compressive strength of Category I units use a 50 %
fractile (p = 0,50) for mean values or 5 % fractile (p = 0,05) for characteristic values and a confidence
level of 95 %.
For production evaluation the manufacturer shall define the conformity criteria in the factory
production control documentation (see 8.3).
5.2 Denomination
The denomination shall be declared in accordance with EN 12440 (meaning traditional name,
petrological family, typical colour and place of origin).
The petrographic name shall be declared in accordance with EN 12407.
5.3 Dimensions and tolerances
5.3.1 Dimensions
The dimensions of a natural stone masonry unit shall be declared (by the manufacturer/supplier) in
mm for length, width and height in that order. They shall be given in terms of work size and in addition
the coordinating size may be given. The assembly dimensions may also be given.
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EN 771-6:2005 (E)
Key
1 Length
2 Width
3 Height
4 Bed
5 Face
6 Header
Figure 1 — Dimensions and surfaces for dimensioned stone and squared rubble stone
5.3.2 Dimensional tolerances
The permissible deviations for individual masonry units shall be as given in Table 1. The manufacturer
shall also declare which tolerance category the dimensioned natural stone masonry units shall fulfil.
The manufacturer may declare closer tolerances for one or more dimensions.
When sampled in accordance with Annex A and tested in accordance with EN 772-16 using
measurement method a) the deviation from the declared dimensions shall not exceed the tolerances
for the dimensions in question taken from Table 1 or any closer tolerance the manufacturer has
declared.
In addition the definition of dimensioned stone (finished units) includes the requirement that the faces
and headers are plane without a separate declaration and that the bed faces of category D3 masonry
units are suitable for use with thin layer mortar. When sampled in accordance with Annex A and
tested in accordance with EN 772-20 the flatness shall meet the requirements of Table 1. When
sampled in accordance with Annex A and tested in accordance with EN 13373 the out of squareness
shall meet the requirements of Table 1.
When dimensioned stone masonry units category D3, intended for use with thin layer mortar, are
sampled in accordance with Annex A and tested in accordance with EN 772-16 by procedure d, the
deviation from plane parallelism shall not exceed the values given in Table 1.
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EN 771-6:2005 (E)
Table 1 — Dimensional tolerances for natural stone masonry units
Squared rubble
Dimensioned stone
stone
Dimensions Rubble stone
Sawn faces
Faces roughly cut
D1 D2 D3
Length ± 5 mm ± 2 mm ± 2 mm ± 15 mm No requirement
a
Width ± 5 mm ± 2 mm ± 2 mm No requirement No requirement
Height ± 5 mm ± 2 mm ± 1 mm ± 15 mm No requirement
0,3 % of the
0,5 % of the longest 0,3 % of the ± 1,5 % for longest
longest dimension
Flatness dimension of the longest dimension of the face and not straight edge of the No requirement
face of the face more than ± 1mm face
for the bed face
0,5 % for the longest 0,3 % for the 0,3 % for the ± 1,5 % for longest
Squareness straight edge of the longest straight longest straight straight edge of the No requirement
face edge of the face edge of the face face
Plane
≤ 1,0
parallelism
a
Not in the case of extra width.
5.4 Configuration
5.4.1 General
The geometry, shape and features of natural stone masonry units shall be declared by the
manufacturer.
The test shall be carried out according to EN 772-16.
5.4.2 Surface appearance
An indicative sample shall show the general tonality and finish of the natural stone, but does not imply
any total uniformity in colour, and veins between the sample and supply.
Indicative samples shall also show the surface finish proposed.
NOTE Indicative samples should be delivered to the customer as an indication of specific characteristics
such as glass seams, spots, holes for travertine, worm holes for marble, crystalline veins, rust stains, geodes,
lens etc. which should not be considered as flaws.
When an indicative sample cannot exhibit sufficiently the characteristic features of the stone, at least
three specimens shall be delivered.
One specimen out of three should indicate the average appearance and the other two the extreme
appearance.
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EN 771-6:2005 (E)
5.5 Apparent density
The manufacturer shall declare the apparent density of six specimens sampled in accordance with
Annex A and tested in accordance with EN 1936.
NOTE The term apparent density used in relation to natural stone units is the same property declared as
gross density in EN 771 Parts 1 to 5.
5.6 Mechanical strengths
5.6.1 Compressive strength
The manufacturer shall declare the mean compressive strength and, when relevant, the normalised
compressive strength. In addition the manufacturer may declare the characteristic compressive
strength (5 % fractile). In addition, the manufacturer shall declare whether the natural stone masonry
unit is classified as Category I or Category II.
The normalised compressive strength procedure of a natural stone masonry unit is given in
EN 772-1:2000, Annex A.
When the natural stone masonry units are sampled from a consignment in accordance with Annex A
and tested in accordance with EN 772-1 and conditioned in accordance with EN 772-1:2000, 7.3.3 b),
then the mean compressive strength of the specified number of natural stone masonry units from a
consignment shall be not less than the declared compressive strength and no individual unit shall
have a compressive strength of less than 80 % of the declared mean value.
When it is not convenient to test whole units the test specimen may be cubes with (70 ± 5) mm or
(50 ± 5) mm edge or right circular cylinders with diameter and height which are equal to (70 ± 5) mm
or (50 ± 5) mm.
Sawn test specimens shall be representative of the original unit section.
The declaration shall relate to and indicate the intended orientation of natural stone masonry units as
tested and the method of bedding the units. Where, due to its means of formation the strength
properties of the stone are not isotropic, e.g. due to presence of bedding planes, it may be necessary
to declare the compressive strength normal to more than one face of the test specimen. If the grinding
process significantly alters the contact area of the faces tested or if the flatness tolerance cannot be
achieved and the capping procedure is thereby used this shall be declared.
The size and shape of the specimen tested shall be reported.
NOTE When shape factors are available e.g. in a database to be used to normalize the compressive strength
from cut cubes or cylinders, these may be used.
5.6.2 Flexural strength
For natural stone masonry units that could be subjected to flexural stress during use, the
manufacturer shall declare the mean flexural strength of six specimens sampled in accordance with
Annex A and tested in accordance with EN 12372.
5.7 Shear bond strength
5.7.1 General
For natural stone masonry units intended to be used in elements subjected to structural requirements
the shear bond strength of the unit in combination with mortar shall be declared in terms of the
characteristic initial shear strength in accordance with EN 1052-3. The declaration may be made
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EN 771-6:2005 (E)
either on the basis of fixed values as in 5.7.2 below or tests as in 5.7.3 below. The manufacturer shall
declare whether the value of bond strength has been obtained from the fixed values or from test.
NOTE In most cases it is expected that the use of fixed values will be sufficient.
5.7.2 Declaration based on fixed values
When no declaration is made in accordance with 5.7.3 the characteristic initial shear strength of the
unit in combination with mortar may be declared by reference to EN 998-2:2003, Annex C.
5.7.3 Declaration based on tests
The characteristic initial shear strength of the unit in combination with a specific type of mortar
specified in accordance with EN 998-2 may be declared based on the tests on masonry units sampled
from a consignment in accordance with Annex A and tested in accordance with EN 1052-3. The
characteristic initial shear strength shall not be less than the declared value.
NOTE Bond strength depends on the mortar, the masonry unit and the workmanship.
5.8 Flexural bond strength
When relevant to the uses for which natural stone masonry units are put on the market, the flexural
bond strength of masonry made with the units and mortar specified in accordance with EN 998-2 shall
be declared. The declaration shall give the value of the characteristic flexural strength of the masonry
combination for either a plane of failure perpendicular to the bed joints or a plane of failure parallel to
the bed joints or both, as relevant, and the mortar specification for which the declaration is valid.
When natural stone masonry units are sampled in accordance with Annex A and tested in
combination with the specified mortar, in accordance with EN 1052-2, the characteristic flexural
strength of the relevant masonry specimens shall not be less than the declared value for the plane of
failure.
5.9 Open porosity
The manufacturer shall declare the average open porosity of six specimens sampled in accordance
with Annex A and tested in accordance with EN 1936.
5.10 Water absorption coefficient by capillarity
When relevant for the uses of the product the water absorption coefficient due to the capillary action
shall be declared by the manufacturer. When the natural stone masonry units are sampled from a
consignment in accordance with Annex A and tested in accordance with EN 772-11 then the mean
water absorption of the specified number of natural stone masonry units shall be not greater than the
declared water absorption.
When it is not convenient to test whole units the test specimen may be cubes with (70 ± 5) mm edge
or cylinders with diameter and height which are equal to (70 ± 5) mm. The area of the base to be
immersed shall be calculated by measurements of two medians to the nearest 0,1 mm. The mass of
the specimen shall weigh to the nearest 0,01 g. The specimens shall be weighed a minimum of
7 times, at the following intervals ± 5 %:
High absorbent stone: time = 1, 3, 5, 10, 15, 30, 60, 480 and 1 440 min.
Low absorbent stone: time = 30, 60, 180, 480, 1 440, 2 880 and 4 320 min.
When the stone shows bedding planes or anisotropy features, the test shall be carried out with the
base immersed parallel to that which will be horizontal during use. If no arrangement of use is
established (e.g. isometric units) two values of coefficient of absorption due to capillary action shall be
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EN 771-6:2005 (E)
declared: normal and parallel to the bedding or anisotropy. In that case, two sets of six specimens
shall be tested.
5.11 Durability
When relevant to the uses for which the units are put on the market, the manufacturer shall declare
the units as freeze/thaw resistant or not freeze/thaw resistant, dependant upon the location i.e.
geographical or in a building. For units sampled in accordance with annex A and tested in accordance
with EN 12371 and declared as freeze/thaw resistant the manufacturer shall also declare the number
of cycles the units can resist without initiating cracks, ruptures etc.
NOTE When the intended use of the product provides a complete protection against water penetration (e.g.
a suitable layer of render, cladding, inner leaf of a cavity wall, internal walls) no reference to freeze/thaw
resistance is required.
5.12 Thermal properties
When relevant to the uses for which the unit is put on the market and in all cases for masonry units
intended to be used in elements subject to thermal insulation requirements the manufacturer shall
provide information on the thermal properties of the natural stone masonry units. If so, it shall be done
by reference to EN 1745.
5.13 Reaction to fire
For natural stone masonry units intended to be used in elements subject to fire requirements the
manufacturer shall declare the reaction to fire classification of the masonry unit.
For natural stone masonry units containing ≤ 1,0 % by mass or volume (whichever is the most
onerous) of homogeneously distributed organic materials the declaration may be fire Class A1 without
the need to test.
Natural stone masonry units containing > 1,0 % by mass or volume (whichever is the most onerous)
of homogeneously distributed organic materials shall be tested in accordance with EN 13501-1 and
the appropriate fire classification declared.
NOTE Attention is drawn to the Commission Decision 96/603/EC, amended by Commission Decision
2000/605/EC, in which non-combustible masonry units containing not more than 1 % (by mass or volume
whichever is the more onerous) of homogeneously distributed organic materials are classified as reaction to fire
Class A1 without testing.
5.14 Water vapour permeability
This characteristic shall be declared upon request (e.g. when the unit is to be used in a location
subject to vapour control requirements and fixed by means of mortar or adhesives).
The permeability shall be given by making reference to tabulated values in EN 12524, or by
determining the permeability using the test method in EN ISO 12572 and the results expressed
accordingly.
6 Description, designation and classification of natural stone masonry units
6.1 Description and designation
The description and designation of a natural stone masonry unit shall comprise at least the following:
a) number, title and date of issue of this document, i.e. EN 771-6;
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EN 771-6:2005 (E)
b) work size dimensions and tolerance category (for dimensioned natural stone masonry units)
(see 5.3);
c) denomination (see 5.2);
d) mean compressive strength and the size and shape of the specimen tested (see 5.6.1).
When relevant to the uses for which the unit is placed on the market the description and designation
shall include:
e) normalised compressive strength (see 5.6.1);
f) mean flexural strength (see 5.6.2);
g) shear bond strength (see 5.7);
h) flexural bond strength (see 5.8);
i) open porosity (see 5.9);
j) apparent density (see 5.5);
k) water absorption coefficient by capillarity (see 5.10);
l) durability (see 5.11);
m) thermal properties (see 5.12).
Other technical information may optionally be provided.
6.2 Classification
Specification of the properties of masonry units may be given by reference to classification systems
provided those systems are based only on those properties included in this European Standard and
do not themselves constitute a barrier to trade.
This does not remove the requirement that all manufacturers claiming compliance with this European
Standard shall state declared values of the properties of their products, when required.
7 Marking
The following particulars shall be clearly marked in one of the following: the units, the packaging, the
delivery note or any certificate supplied with the masonry units:
a) name, trademark or other means of identification of the manufacturer/supplier;
b) means of identifying the masonry units and relating them to their description and designation.
NOTE For CE-marking and labelling see Annex ZA. Where ZA.3 requires the CE-marking to be
accompanied by the same information as required by this clause the requirements of this clause can be
considered to have been met.
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EN 771-6:2005 (E)
8 Evaluation of conformity
8.1 General
The manufacturer/s
...
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