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 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.

Festlegungen für Mauersteine - Teil 6: Natursteine

Spécification pour éléments de maçonnerie - Partie 6: Éléments de maçonnerie en pierre naturelle

Specifikacija za zidake - 6. del: Zidaki iz naravnega kamna

Ta evropski standard določa značilnosti in zahteve za zmogljivost zidakov iz naravnega kamna, širokih 80 mm ali več, ki so predvideni predvsem za uporabo pri splošni, fasadni in izpostavljeni zidavi pri nosilnih ali nenosilnih visokih ali nizkih gradnjah. Ti zidaki so primerni za vse oblike sten z zidaki v ravnih vrstah ali naključno razporejenimi zidaki, ki vključujejo enoslojne zidove, votle zidove, predelke, oporne zidove in zunanje stene dimnikov. Zagotavljajo lahko zaščito pred požarom, toplotno izolacijo, zvočno izolacijo in zvočno absorpcijo.
Ta evropski standard vključuje zidake iz naravnega kamna nepravokotnih paralelepipednih oblik, zidake posebnih oblik in pomožne zidake za uporabo v notranjosti in zunanjosti.
Opredeljuje zmogljivost v zvezi z npr. močjo, petrografskim opisom, gostoto, poroznostjo, dimenzijsko natančnostjo, toplotno prevodnostjo, vpijanjem vode in odpornostjo proti zmrzali ter omogoča »ocenjevanje in preverjanje nespremenljivosti zmogljivosti (AVCP)« proizvodov v skladu s tem evropskim standardom. Vključene so zahteve za označevanje proizvodov, ki jih zajema ta evropski standard.
Ta evropski standard ne zajema panelov etažne višine, naravnega kamna za tlakovanje, oblog za dimne cevi za dimnike ali zidakov, ki se uporabljajo kot izolacijska zaščita pred vlago.

General Information

Status
Published
Publication Date
18-Aug-2015
Technical Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
14-Mar-2022

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SLOVENSKI STANDARD
SIST EN 771-6:2011+A1:2015
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
SIST EN 771-6:2011+A1:2015 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 771-6:2011+A1:2015
---------------------- Page: 2 ----------------------
SIST EN 771-6:2011+A1:2015
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.
---------------------- Page: 3 ----------------------
SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (E)
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

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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (E)

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

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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (E)
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.

---------------------- Page: 6 ----------------------
SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (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 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
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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (E)

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

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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (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 %

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

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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (E)
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.
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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (E)
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.
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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (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
± 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
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.
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SIST EN 771-6:2011+A1:2015
EN 771-6:2011+A1:2015 (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 771-1 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 sto

...

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