EN 771-1:2011+A1:2015

Specification for masonry units - Part 1: Clay masonry units

This European Standard specifies the characteristics and performance requirements for masonry units manufactured from clay for which the main intended uses are protected or unprotected masonry structure (see definitions 3.3 and 3.4) (e.g. facing and rendered masonry, loadbearing or non-loadbearing masonry structures, including internal linings and partitions, for building and civil engineering).
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This European Standard includes those clay masonry units of an overall non-rectangular parallelepiped shape.
It defines the performance related to e.g. dimensional tolerances, strength, density measured according to the corresponding test methods contained in separate European Standards.
It provides for the assessment and verification of constancy of performance (AVCP) of the product to this European Standard.
The marking requirement for products covered by this European Standard is included.
This European Standard 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 European Standard does not include method of measurement of angles and radii characteristics of specially shaped clay masonry units.
This European Standard does not cover requirements for the following: units for paving, flue liners and storey height clay masonry units and clay masonry units with an incorporated thermal insulation material bonded to the faces of the unit susceptible to be exposed to fire. It does, however, include clay masonry units for external chimney masonry.

Festlegungen für Mauersteine - Teil 1: Mauerziegel

Spécification pour éléments de maçonnerie - Partie 1: Briques de terre cuite

Specifikacija za zidake - 1. del: Opečni zidaki

Ta evropski standard določa lastnosti in zahteve za zmogljivost za zidake, narejene iz opeke, ki so predvideni predvsem za uporabo pri zaščiteni ali nezaščiteni zidani konstrukciji (glej definiciji 3.3 in 3.4) (npr. zidava fasad in oblaganje, nosilne ali nenosilne zidarske konstrukcije, vključno z notranjimi oblogami in pregradami, za visoke ali nizke gradnje).
Ta evropski standard vključuje opečne zidake nepravokotnih paralelepipednih oblik.
Opredeljuje zmogljivosti v zvezi z npr. dimenzijskimi tolerancami, močjo, gostoto, izmerjeno v skladu z ustreznimi preskusnimi metodami, navedenimi v ločenih evropskih standardih.
Omogoča ocenjevanje in preverjanje nespremenljivosti zmogljivosti (AVCP) proizvodov v skladu s tem evropskim standardom.
Vključena je zahteva za označevanje proizvodov, ki jih zajema ta evropski standard.
Ta evropski standard ne določa standardnih velikosti opečnih zidakov niti ne določa standardnih delovnih dimenzij, kotov in polmerov opečnih zidakov posebnih oblik. Ta evropski standard ne vključuje metode merjenja značilnosti kotov in polmerov opečnih zidakov posebnih oblik.
Ta evropski standard ne zajema zahtev za spodaj navedeno: zidaki za tlakovanje, obloge za dimne cevi in opečni zidaki etažne višine ter opečni zidaki z vgrajenim materialom za toplotno izolacijo, vezanim na stranice zidaka, ki so lahko izpostavljene ognju. Vključuje pa opečne zidake za zidavo zunanjosti dimnikov.

General Information

• Status: Published
• Publication Date: 18-Aug-2015
• ICS: 91.100.25 - Terracotta building products
• Technical Committee: CEN/TC 125 - Masonry
• Drafting Committee: CEN/TC 125/WG 1 - Masonry units
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 14-Mar-2022
• Completion Date: 14-Apr-2025
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/116 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on masonry and related products
• Ref Project: SIST EN 771-1:2011+A1:2015 - Specification for masonry units - Part 1: Clay masonry units

Relations

• Merged From: EN 771-1:2011 - Specification for masonry units - Part 1: Clay masonry units
• Effective Date: 08-Jun-2022
• Merged From: EN 771-1:2011/FprA1 - Specification for masonry units - Part 1: Clay masonry units
• Effective Date: 21-Jan-2015

Overview

EN 771-1:2011+A1:2015 is the CEN European standard for clay masonry units. It specifies the required characteristics, performance criteria and conformity assessment for clay-made masonry units intended for use in protected and unprotected masonry (facing, rendered, loadbearing and non‑loadbearing masonry, internal linings and partitions, and external chimney masonry). The standard defines test-based requirements (referencing EN 772 series test methods), marking and the framework for Assessment and Verification of Constancy of Performance (AVCP) and factory production control (FPC).

Key topics and technical requirements

• Scope & exclusions: Covers rectangular and non‑rectangular parallelepiped clay units; excludes paving units, flue liners, storey‑height units and units with bonded thermal insulation exposed to fire.
• Dimensional tolerances & configuration: Requirements for dimensions, tolerances and unit configuration for units intended for protected (P) and unprotected (U) masonry.
• Density & voids: Classification and measurement methods (see EN 772 parts) for unit density and percentage of voids.
• Compressive strength: Performance classes and testing procedures to establish structural capacity.
• Water properties: Water absorption, initial rate of water absorption (for U units), and moisture movement requirements to manage durability and mortar compatibility.
• Durability & freeze/thaw: Criteria and guidance for long‑term resistance to weathering and freeze/thaw exposure (informative annexes).
• Active soluble salts & efflorescence: Limits and testing for soluble salts that can cause staining or deterioration.
• Thermal & hygric properties: Guidance on thermal properties and water vapour permeability where relevant.
• Reaction to fire: Classification requirements for fire safety performance.
• Bond strength: Requirements to ensure masonry bond performance with mortars.
• Marking & designation: Mandatory marking elements and a designation code for product identification and CE‑marking.
• AVCP & FPC: Procedures for product type determination, sampling, factory production control, testing frequencies and traceability; Annex ZA aligns the standard with the EU Construction Products Regulation (CPR).

Applications and who uses it

• Manufacturers: to design production, define FPC and demonstrate conformity for CE marking.
• Architects & structural engineers: to select appropriate clay units by strength, durability and thermal/water properties.
• Specifiers & consultants: to write compliance requirements into procurement and tender documents.
• Contractors & masons: to confirm suitability of units for exposed conditions, loadbearing work or facing applications.
• Regulators & testing bodies: to assess AVCP, sampling and independent testing.

Related standards

• EN 771 series (other masonry unit materials: calcium silicate, concrete, AAC, manufactured and natural stone)
• EN 772 series (test methods for masonry units)
• Eurocode 6 (design rules for masonry)
• EU Construction Products Regulation (Regulation (EU) No 305/2011) - Annex ZA references

Keywords: EN 771-1, clay masonry units, CEN, masonry standards, AVCP, compressive strength, water absorption, dimensional tolerances, CE marking, factory production control.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Festlegungen für Mauersteine - Teil 1: MauerziegelSpécification pour éléments de maçonnerie - Partie 1: Briques de terre cuiteSpecification for masonry units - Part 1: Clay masonry units91.100.25Gradbeni izdelki iz terakoteTerracotta building productsICS:Ta slovenski standard je istoveten z:EN 771-1:2011+A1:2015SIST EN 771-1:2011+A1:2015en,fr,de01-oktober-2015SIST EN 771-1:2011+A1:2015SLOVENSKI
STANDARDSIST EN 771-1:20111DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 771-1:2011+A1
August 2015 ICS 91.100.25 Supersedes EN 771-1:2011English Version
Specification for masonry units - Part 1: Clay masonry units
Spécification pour éléments de maçonnerie - Partie 1: Briques de terre cuite
Festlegungen für Mauersteine - Teil 1: Mauerziegel 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 worldwide for CEN national Members. Ref. No. EN 771-1:2011+A1:2015 ESIST EN 771-1:2011+A1:2015

!Sampling for product type determination tests and for independent testing of consignments" . 34 A.1 General . 34 A.2 Sampling procedure . 34 A.2.1 General . 34 A.2.2 Random sampling . 34 A.2.3 Representative sampling . 34 A.2.4 Dividing the sample . 35 A.2.5 Number of units required for testing . 36 Annex B (informative)
Additional information . 38 B.1 Use of clay masonry units . 38 B.2 Durability . 39 B.3 Freeze/thaw resistance . 39 B.3.1 General . 39 B.3.2 Masonry subjected to severe exposure . 39 B.3.3 Masonry subjected to moderate exposure . 40 B.3.4 Masonry subjected to passive exposure . 40 B.4 Sulfate action on mortars and plasters . 40 B.5 Efflorescence and staining . 41 B.6 General guidance on the appearance of facing clay masonry units . 41 Annex C (informative)
Guidelines 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 . 42 Annex ZA (informative)
!Clauses of this European Standard addressing the provisions of the EU Construction Products Regulation" . 44 ZA.1 Scope and relevant characteristics . 44 ZA.2 Procedure for AVCP of clay masonry units . 47 ZA.2.1 System(s) of AVCP . 47 ZA.2.2 Declaration of performance (DoP) . 48 ZA.3 CE marking and labelling. 54 Bibliography . 57
Part 1: Determination of compressive strength EN 772-3, Methods of test for masonry units
Part 3: Determination of net volume and percentage of voids of clay masonry units by hydrostatic weighing EN 772-5, Methods of test for masonry units
Part 5: Determination of the active soluble salts content of clay masonry units EN 772-7, Methods of test for masonry units
Part 7: Determination of water absorption of clay masonry damp proof course units by boiling in water 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 772-11, 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 772-13, Methods of test for masonry units
Part 13: Determination of net and gross dry density of masonry units (except for natural stone) SIST EN 771-1:2011+A1:2015

Part 16: Determination of dimensions EN 772-19, Methods of test for masonry units
Part 19: Determination of moisture expansion of large horizontally perforated clay masonry units 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 772-21, Methods of test for masonry units
Part 21: Determination of water absorption of clay and calcium silicate masonry units by cold water absorption 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 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. NOTE Annex B to this European Standard is informative and gives descriptions of such matters as applications, exposure and durability. 3.1 masonry unit preformed component intended for use in masonry construction 3.2 clay masonry unit masonry unit made from clay or other argillaceous materials with or without sand, fuel or other additives fired at a sufficiently high temperature to achieve a ceramic bond 3.3 protected masonry !masonry which is protected against water penetration and is not in contact with soil and ground water Note 1 to entry: It can either be masonry in external walls which is protected, (e.g. by a layer of suitable render or by cladding), or it can be the inner leaf of a cavity wall or it can be an internal wall. It may or may not be loadbearing." ! 3.4 unprotected masonry masonry which may be exposed to rain, freeze/thaw and/or may be in contact with soil and ground water without a suitable protection Note 1 to entry: It can either be masonry in external walls which is fully unprotected, or which is intended to be provided by a limited protection (e.g. by a thin layer of render). It may or may not be loadbearing." 3.5 !P unit clay masonry unit for use in protected masonry" SIST EN 771-1:2011+A1:2015

Key 1 Length 3 Height 5 Face 2 Width 4 Bed 6 Header NOTE This relates to the normal use of the masonry unit in the wall. Figure 1 — Dimensions and surfaces SIST EN 771-1:2011+A1:2015

dimension) size (work mm or 3 mm whichever is the greater T1+: ± 0,40
dimension) size (work mm or 3 mm for length and width whichever is the greater and ± 0,05
dimension) size (work mm or 1 mm for the height whichever is the great T2: ± 0,25
dimension) size (work mm or 2 mm whichever is the greater T2+: ± 0,25
dimension) size (work mm or 2 mm for length and width whichever is the greater and ± 0,05
dimension) size (work mm or 1 mm for the height whichever is the greater or Tm: a deviation in mm declared by the manufacturer (may be wider or closer than the other categories).
5.2.1.2.3 Range (!P" units) When declared and regular-shaped clay masonry units are sampled from a consignment in accordance with Annex A and tested in accordance with EN 772-16, the maximum range for any given dimension (i.e. the difference between the largest and smallest determined dimensions on individual units) to be found within the test sample shall be within the declared one of the five categories indicated below, where the value shall be rounded to whole mm: Category Maximum range R1: 0,6 dimension) size (workmm R1+: 0,6 dimension) size (workmm for length and width and 1,0 mm for the height R2: 0,3 dimension) size (workmm SIST EN 771-1:2011+A1:2015

5.2.1.2.4 Flatness of bed faces (!P" 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. 5.2.1.2.5 Plane parallelism of bed faces (!P" 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, the deviation from plane parallelism of the bed faces shall not exceed the declared value. SIST EN 771-1:2011+A1:2015

a) Vertically perforated unit b) Vertically perforated unit with mortar pocket c) Vertically perforated unit with grip holes
d) Vertically perforated unit with tongue and groove system e) Horizontally perforated unit (for partition walls) f) Horizontally perforated unit with rendering keyways
g) Horizontally perforated unit with mortar pocket h) Unit for concrete or mortar infill i) Unit for masonry panels Figure 2 — Examples of !P" units When relevant to the uses, for which clay masonry (!P") units are placed 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 × width × height of the unit; — volume of the largest of any formed voids as a percentage of the length × width × height of the unit; — volume of grip holes as a percentage of the length × width × height of the unit; — thickness of webs; SIST EN 771-1:2011+A1:2015

or — Dm: a deviation in % declared as a whole number by the manufacturer (may be wider or closer than the other categories).
5.2.4 Compressive strength (!P" units) When relevant to the uses for which the unit is placed 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 by the manufacturer. The manufacturer shall also declare the normalized compressive strength when relevant. NOTE 1 The manufacturer may also inform in what way the declared compressive strength fits into a national classification system. NOTE 2 EN 772-1 gives instructions on how to convert the unit compressive strength into the normalized compressive strength. In addition, the manufacturer shall declare whether the clay masonry unit is Category I or Category II. SIST EN 771-1:2011+A1:2015
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