SIST EN 771-1:2004/A1:2005

SLOVENSKI STANDARD
SIST EN 771-1:2004/A1:2005
01-april-2005
6SHFLILNDFLMD]D]LGDNH±GHO2SHþQL]LGDNL
Specification for masonry units - Part 1: Clay masonry units
Festlegungen für Mauersteine - Teil 1: Mauerziegel
Spécification pour les éléments de maçonnerie - Partie 1:Briques de terre cuite
Ta slovenski standard je istoveten z: EN 771-1:2003/A1:2005
ICS:
91.100.25
SIST EN 771-1:2004/A1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 771-1:2003/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2005
ICS 91.100.30
English version
Specification for masonry units - Part 1: Clay masonry units
Spécification pour les éléments de maçonnerie - Partie Festlegungen für Mauersteine - Teil 1: Mauerziegel
1:Briques de terre cuite
This amendment A1 modifies the European Standard EN 771-1:2003; it was approved by CEN on 29 December 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant 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 amendment 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 771-1:2003/A1:2005: E
worldwide for CEN national Members.

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EN 771-1:2003/A1:2005 (E)
Contents
Page
Foreword.3
1 Modification in Scope.4
2 Modification in Normative references .4
3 New 3.35 combined thickness of webs and shells.4
4 Modifications in 5.2.1.1 .4
5 Modifications in 5.2.1.2 .5
6 New 5.2.1.2.4 Flatness of bed faces (LD units).5
7 New 5.2.1.2.5 Plane parallelism of bed faces (LD units).6
8 Modification in 5.2.2.1 General (LD units) .6
9 Modification in 5.2.2.2 Thickness of shells and webs (LD units).6
10 Modification in 5.2.3.1 Gross dry density (LD units).7
11 Modification in 5.2.3.2 Net dry density (LD units) .7
12 Modifications in 5.2.4 Compressive strength (LD units) .7
13 Modification in 5.3.1 Dimensions and tolerances (HD units) .7
14 Modification in 5.3.2 Configuration (HD units) .9
15 Modification in 5.3.3.1 Gross dry density (HD units) .10
16 Modification in 5.3.3.2 Net dry density (HD units) .10
17 Modification in 5.3.4 Compressive strength (HD units).10
18 Modification in 6.1.1 LD units.11
19 Modification in 6.1.2 HD units.11
20 Modification in 8.2 Initial type tests .11
21 Modification in Table A.1 — Number of LD units required for a test .12
22 Modification in Table A.2 — Number of HD units required for a test.12
23 Modification in Table ZA.1.1 — Scope and relevant clauses for LD units.12
24 Modification in Table ZA.1.2 — Scope and relevant clauses for HD units .13
25 Modification in Figure ZA.1 — Examples of CE Marking information.13
26 Deletion of Bibliography .14

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EN 771-1:2003/A1:2005 (E)
Foreword
This document (EN 771-1:2003/A1:2005) has been prepared by Technical Committee CEN/TC 125 "Masonry",
the Secretariat of which is held by BSI.
This Amendment to the European Standard EN 771-1:2003 shall be given the status of a national standard,
either by publication of an identical text or by endorsement, at the latest by August 2005, and conflicting
national standards shall be withdrawn at the latest by August 2005.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see modifications to informative Annex ZA, which is an integral part of
this document.
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 771-1:2003/A1:2005 (E)

1 Modification in Scope
Delete penultimate paragraph and substitute:
"This document does not specify standard sizes for clay masonry units, nor does it specify standard work
dimensions, angles and radii of specially shaped clay masonry units. This document does not include method
of measurement, tolerance and range requirements for dimensions, angles and radii characteristics of
specially shaped clay masonry units.”
2 Modification in Normative references
Add the following references:

"EN 772-9, Methods of test for masonry units — Part 9: Determination of volume and percentage of voids and
net volume of clay and calcium silicate masonry units by sand filling

EN 772-20, Methods of test for masonry units — Part 20: Determination of flatness of faces of masonry units
EN 998-2, Specification for mortar for masonry — Part 2: Masonry mortar
EN 1996-1-1, Eurocode 6: Design of masonry structures — Part 1-1:Common rules for reinforced and
unreinforced masonry structures
EN 1996-1-2, Eurocode 6: Design of masonry structures — Part 1-2: General rules — Structural fire design"
3 New 3.35 combined thickness of webs and shells
Add the following new definition:

"3.35
combined thickness of webs and shells
the sum of the thicknesses of the shells and webs from one face or header of a masonry unit to the opposite
face or header respectively along whichever path, via the formed voids, gives the smallest value, expressed
as a percentage of the unit width or length respectively
4 Modifications in 5.2.1.1
In line 4, delete "NOTE 1" and substitute "NOTE"
Add the following immediately below Figure 1:
"The following measurement procedure shall be used:
 when at least two of the work dimensions of the unit are not greater than 250 mm, 125 mm and 100 mm
for length, width and height respectively procedure b) as described in EN 772-16 shall be followed using
a calliper with overlapping jaws with the jaws aligning with the dotted lines in Fig. 1 b) of EN 772-16:2000
with the exception for the measurement of the height which is determined as the average of two
measurements, where the second measurement is transverse to the dotted line at the middle of the unit.
The width of the jaws shall be not less than 5 and not greater than 10 mm.
 for all other units procedure a) as described in EN 772-16 shall be followed."
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EN 771-1:2003/A1:2005 (E)

Delete "The manufacturer shall also declare . . . . . drawings to achieve these requirements" and substitute the
following:
5.2.1.2 Dimensional tolerances (LD units)
5.2.1.2.1 Tolerances (LD units)
The manufacturer shall also declare which of the tolerance categories for mean values in 5.2.1.2.2 the clay
masonry units fulfil.
When relevant to the uses for which the unit is put on the market, the manufacturer shall also declare which of
the range categories in 5.2.1.2.3 a given consignment of the clay masonry units fulfils.
NOTE This additional declaration may be made for example in relation to:
 achievement of the required accuracy (planarity, bonds and thin layer joints) of the masonry;
 use of detailed project drawings to achieve these requirements."
5 Modifications in 5.2.1.2
Delete:
"5.2.1.2 Tolerances (LD units)
Mean value"
and substitute "5.2.1.2.2 Tolerance of the mean value (LD units)"
In line 2 delete "procedure stated below" and substitute "procedure stated in 5.2.1.1,"
Delete "Range" and substitute "5.2.1.2.3 Range (LD units)"
Delete "When declared and the clay masonry units . . . procedure stated below . . ." and substitute "When
declared and regular shaped clay masonry units . . . procedure in 5.2.1.1, . . ."
Delete:
" Measurement procedure
The following measurement procedure . . . . . procedure a) as described in EN 772-16 shall be followed."
6 New 5.2.1.2.4 Flatness of bed faces (LD units)
Add the following new subclause:

"5.2.1.2.4 Flatness of bed faces (LD units)

When clay masonry units are intended to be used with thin layer mortar, the manufacturer shall declare the
maximum deviation from flatness of the bed faces.
When regular shaped clay masonry units are sampled from a consignment in accordance with Annex A and
tested in accordance with EN 772-20, the deviation from flatness of the bed faces shall not exceed the
declared value.
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EN 771-1:2003/A1:2005 (E)
7 New 5.2.1.2.5 Plane parallelism of bed faces (LD units)
Add the following new subclause:

"5.2.1.2.5 Plane parallelism of bed faces (LD units)
When clay masonry units are intended to be used with thin layer mortar, the manufacturer shall declare the
maximum deviation from plane parallelism of the bed faces.
When regular shaped clay masonry units are sampled from a consignment in accordance with Annex A and
tested in accordance with EN 772-16 by procedure d), the deviation from plane parallelism of the bed faces
shall not exceed the declared value.
8 Modification in 5.2.2.1 General (LD units)
Delete the existing text after Figure 2 and substitute the following:
“When relevant to the uses, for which clay masonry (LD) units are put on the market, the configuration shall be
declared. The declaration may be made by reference to one or another of the groups defined in EN 1996-1-1
or EN 1996-1-2 and/or it may include one or more items such as those in the following list, as relevant:
 shape and features, including the direction of perforations (by means of a drawing or illustration,
when relevant);
 volume of all formed voids as a percentage of the length x width x height of the unit;
 volume of the largest of any formed voids as a percentage of the length x width x height of the unit;
 volume of grip holes as a percentage of the length x width x height of the unit;
 thickness of webs;
 thickness of shells;
 combined thickness of webs and shells from face to face;
 combined thickness of webs and shells from header to header;
 area of voids on a bed face as a percentage of the length x width of the unit;
NOTE The header of clay masonry units may have interlocking features, e.g. mortar pockets, tongue and groove
systems. The face of clay masonry units may have a surface-profile (rendering keyways).
Each declared value shall be stated as either an upper limit or a lower limit or as a range of values. When
clay masonry units are sampled from a consignment in accordance with Annex A and tested in accordance
with EN 772-16, EN 772-9 and EN 772-3, as specified below, the mean value derived from measurements of
the test sample shall be within the range or limit declared."
9 Modification in 5.2.2.2 Thickness of shells and webs (LD units)
In the first paragraph, delete the second sentence “The minimum …appropriate.”
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EN 771-1:2003/A1:2005 (E)
10 Modification in 5.2.3.1 Gross dry density (LD units)
Add new final paragraph:
“In addition, the manufacturer may declare the minimum and maximum individual values of gross dry density.”
11 Modification in 5.2.3.2 Net dry density (LD units)
At the start of the first sentence delete “The” and substitute the following:
“When relevant to the uses for which the unit is put on the market, the”
Add new final paragraph:
“In addition, the manufacturer may declare the minimum and maximum individual values of net dry density.”
12 Modifications in 5.2.4 Compressive strength (LD units)
Delete existing text and substitute the following:
“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 structural requirements, the mean compressive strength shall be declared
...