EN 771-6:2011+A1:2015

SLOVENSKI STANDARD
01-oktober-2015
1DGRPHãþD
SIST EN 771-6:2011
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
Spécification pour éléments de maçonnerie - Partie 6: Eléments de maçonnerie en pierre
naturelle
Ta slovenski standard je istoveten z: EN 771-6:2011+A1:2015
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 771-6:2011+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2015
ICS 91.100.15 Supersedes EN 771-6:2011
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 3 March 2011 and includes Amendment 1 approved by CEN on 11 January 2015.

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
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 771-6:2011+A1:2015 E
worldwide for CEN national Members.

Contents Page
European foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Materials of natural stone .8
5 Requirements for natural stone masonry units .8
5.1 General .8
5.2 Denomination .8
5.3 Dimensions and tolerances .8
5.3.1 Dimensions .8
5.3.2 Dimensional tolerances .9
5.4 !Configuration and appearance" . 10
5.4.1 Configuration . 10
5.4.2 Surface appearance . 10
5.5 Apparent density. 11
5.6 Mechanical strengths . 11
5.6.1 Compressive strength . 11
5.6.2 Flexural strength . 11
5.7 Shear bond strength . 12
5.7.1 General . 12
5.7.2 Declaration based on fixed values . 12
5.7.3 Declaration based on tests . 12
5.8 Flexural bond strength . 12
5.9 Open porosity . 12
5.10 Water absorption coefficient by capillarity . 12
5.11 Durability . 13
5.12 Thermal properties . 13
5.13 Reaction to fire . 13
5.14 Water vapour permeability . 14
5.15 Dangerous substances . 14
6 Description, designation and classification of natural stone masonry units . 14
6.1 Description and designation . 14
6.2 Classification . 15
7 Marking . 15
8 !Assessment and verification of constancy of performance (AVCP)" . 15
8.1 General . 15
8.2 Product type determination . 16
8.3 Factory production control . 17
8.3.1 General . 17
8.3.2 Testing and measuring equipment . 17
8.3.3 Production equipment . 17
8.3.4 Raw materials . 17
8.3.5 Production process . 17
8.3.6 Finished product testing . 18
8.3.7 Statistical techniques . 18
8.3.8 Marking and stock control of products . 18
8.3.9 Traceability . 18
8.3.10 Nonconforming products . 18
Annex A (normative) !Sampling for type testing and for independent testing of consignment" . 19
A.1 General . 19
A.2 Sampling procedure . 19
A.2.1 General . 19
A.2.2 Random sampling . 19
A.2.3 Representative sampling . 19
A.2.4 Dividing the sample . 20
A.2.5 Number of units required for testing . 20
Annex B (informative) !Guidance for test frequencies for designing a FPC system to
demonstrate conformity of finished products with the requirements of the standard and

the declaration of the manufacturer" . 21
Annex ZA (informative) !Clauses of this European Standard addressing the provisions of the

EU Construction Products Regulation" . 23
ZA.1 Scope and relevant characteristics . 23
ZA.2 Procedure(s) for AVCP of natural stone masonry units . 24
ZA.2.1 System(s) of AVCP . 24
ZA.2.2 Declaration of performance (DoP) . 26
ZA.3 CE marking and labelling. 30
Bibliography . 34

European foreword
This document (EN 771-6:2011+A1:2015) 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 February 2016, and conflicting national standards shall be withdrawn
at the latest by May 2017.
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 771-6:2011".
This document includes Amendment 1 approved by CEN on 2015-01-11.
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association and supports basic requirements for construction works of the EU
Construction Products Regulation (Regulation (EU) No 305/2011).
For relationship with EU Regulation/Directive(s), see informative Annex ZA, which is an integral part of this
document."
This European Standard also takes into account the general rules for unreinforced and reinforced masonry in
EN 1996-1-1.
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, 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.
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 loadbearing or non-loadbearing 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 parallelepiped
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 !assessment
and verification of constancy of performance (AVCP)" 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 document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 772-1:2011, 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, autoclaved aerated concrete, manufactured stone and natural stone masonry units due to capillary
action and the initial rate of water absorption of clay masonry units
EN 772-16:2011, 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 aggregate
concrete, manufactured stone and natural stone masonry units
EN 998-2:2010, 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 thermal properties
EN 1936, Natural stone test methods ― 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 ISO 10456, Building materials and products ― Hygrothermal properties ― Tabulated design values and
procedures for determining declared and design thermal values (ISO 10456:2007)
EN 13373, Natural stone test methods ― Determination of geometric characteristics on units
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using
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)
3 Terms and definitions
For the purposes of this document, 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
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 %
NOTE 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
3.23
product group
products from one manufacturer having common values for one or more characteristics
4 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 !product type determination" (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,
!petrographic" 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.
Key
1 Length 3 Height 5 Face
2 Width 4 Bed 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 772-16:2011 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 772-16:2011 by procedure d, the deviation from
plane parallelism shall not exceed the values given in Table 1.
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
± 5 mm ± 2 mm ± 2 mm No requirement No requirement
Width
Height ± 5 mm ± 2 mm ± 1 mm ± 15 mm No requirement
Flatness 0,5 % of the longest 0,3 % of the longest 0,3 % of the longest ± 1,5 % for longest
dimension of the dimension of the dimension of the straight edge of the
face face face and not more face No requirement
than ± 1mm for the
bed face
Squareness 0,5 % for the longest 0,3 % for the 0,3 % for the ± 1,5 % for longest
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 mm
parallelism
a
Not in the case of extra width.
5.4 !Configuration and appearance"
!
5.4.1 Configuration
When relevant to the uses, for which they are put on the market, the geometry, shape and features of natural
stone masonry units shall be declared by the manufacturer. The declaration may be made by reference to one
or another of the groups defined in EN 1996-1-1.
NOTE Dimensioned natural stone units are considered to be Group 1.
The test shall be carried out according to EN 772-16."
5.4.2 Surface appearance
An indicative sample !shall be delivered to the customer upon request. It" 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.
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 771-1 to EN 771-5.
5.6 Mechanical strengths
5.6.1 Compressive strength
The manufacturer shall declare the mean normalised compressive strength (fb). !deleted text" 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 772-1:2011,
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 772-1:2011, 7.3.2 a), the mean
compressive strength of the specified number (at least 10 specimen) 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 (100 ± 5) mm (70 ± 5) mm
or (50 ± 5) mm edge or right circular cylinders with diameter and height which are equal to (100 ± 5) mm
(70 ± 5) mm or (50 ± 5) mm.
The number of specimen shall be at least 10.
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 ten specimens sampled in accordance with Annex A and tested in
accordance with EN 12372.
!When the stone shows bedding planes or anisotropy features, the declaration shall give the orientation of
the force relatively to them."
5.7 Shear bond strength
5.7.1 General
For natural stone masonry units !deleted text" 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 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 998-2:2010, 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 min, 3 min, 5 min, 10 min, 15 min, 30 min, 60 min, 480 min and
1 440 min.
— Low absorbent stone: time = 30 min, 60 min, 180 min, 480 min, 1 440, 2 880 min 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 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, dependent 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 the mean
λ -value and the determination model as prescribed in EN 1745.
10,dry,unit
Additionally another fractile may be provided. In such cases both the additional fractile and the corresponding
λ -value shall be given.
10,dry,unit
When the natural stone masonry units are sampled in accordance with Annex A and tested in accordance with
EN 1745 following the model provided, then the obtained λ-value of the specified number of natural stone
masonry units shall be not greater than the provided λ-value.
When relevant to the use for which the units are put on the market, the value of specific heat capacity given in
EN 1745 may be given.
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.
Information on reaction to fire class of supplementary insulation material shall be on basis of European
Standards as declared by the supplier of insulating material.
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 ISO 10456, or by determining
the permeability using the test method in EN ISO 12572 and the results expressed accordingly.
!
5.15 Dangerous substances
National regulations on dangerous substances may require verification and declaration on release, and
sometimes content, when construction products covered by this standard are placed on those markets.
In the absence of European harmonized test methods, verification and declaration on release/content should
be done taking into account national provisions in the place of use.
NOTE An informative database covering European and national provisions on dangerous substances is available at
the Construction web site on EUROPA accessed through: http://ec.europa.eu/enterprise/construction/cpd-ds/."
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;
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);
!
n) dangerous substances (see 5.15)."
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.
8 !Assessment and verification of constancy of performance (AVCP)"
8.1 General
!The manufacturer shall demonstrate compliance of his product with the requirements of this European
Standard and with the declared performance for the product properties by carrying out both:
— product type determination (see 8.2), which can be physical testing, calculation, reference to tabulated
values or combinations of these methods;
— factory production control (see 8.3).
Alternative methods of test to the reference methods specified in this European Standard may be adopted
except for the product type determination tests and in case of dispute, provided that these alternative methods
satisfy the following:
a) a correlation can be shown to exist between the results from the reference method and those from the
alternative method; or
b) a safe relationship can be demonstrated when using the alternative method compared to the reference
methods and
c) the information on which the relationship is based is available."
!
8.2 Product type determination
After completion of the development of a new product type and before placing on the market, appropriate
product type determination shall be carried out to confirm that the properties predicted from the development
meet the requirements of this standard and the performance of the characteristics to be declared for the
product.
Whenever a major change in the source, blend, or nature of raw materials occurs, or when there is a change
in processing conditions, leading to what the manufacturer considers will constitute a new product type being
produced, the appropriate product type determination shall be repeated.
The manufacturer may define product groups. The product group may differ according to the characteristics in
question.
In the product type determination process a manufacturer may take in consideration already existing test
results.
A manufacturer may use the product type determination results determined by someone else (e.g. another
manufacturer or a research technology & development service provider) to justify his own declaration of
performances regarding a product that is manufactured according to the same design and with raw materials,
constituents and manufacturing methods of the same kind, provided that permission is given by the owner of
the results, and the results are valid for both products.
The tests to be conducted shall be the tests or calculations as described in Table A.1 for the properties
selected from the following list relevant to the manufacturer’s declaration for the product type’s intended use:
— dimensions and tolerances;
— configuration;
— apparent density;
— compressive strength;
— flexural strength;
— shear bond strength;
— flexural bond strength;
— open porosity;
— water absorption coefficient by capillarity;
— freeze/thaw resistance;
— thermal properties;
— reaction to fire;
— water vapour permeability.
Sampling for type testing shall be in accordance with Annex A.
The results of type tests shall be recorded.
NOTE For the performance characteristics to be determined in order to address the Declaration of Performance and
CE marking provisions, see Table ZA.1."
8.3 Factory production control
8.3.1 General
The manufacturer shall
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