oSIST prEN 13914-2:2026

Design, preparation and application of external rendering and internal plastering - Part 2: Internal plastering

This document deals with the design considerations and essential principles for internal plastering systems and application of plastering systems.
The different parts of the EN 13914 series of standards specify requirements and recommendations for detailing, design and material considerations, the selection of mixes and the application of gypsum plasters, gypsum/lime plasters, lightweight plasters, lime/gypsum-, cement- and cement/lime-based plasters, lime-based plasters, clay plasters, silicate plasters, organic plasters, polymer-modified plasters, etc.
This document does not deal with the following:
-   external finishes;
-   painting and/or preparation;
-   impregnations;
-   structural repair of concrete;
-   prefabricated fibre-reinforced plaster elements;
-   surface treatments.
Because of the many varied materials, practices and different climatic conditions, it is not possible for certain aspects of the standard to enter into sufficient detail to be fully usable by all practitioners.
NOTE   Local or national regulations take precedence when applicable.

Planung, Zubereitung und Ausführung von Außen- und Innenputzen - Teil 2: Innenputz

Dieses Dokument behandelt die Planung und wesentliche Grundsätze für Innenputzsysteme sowie für die Ausführung von Innenputzsystemen.
Die einzelnen Abschnitte der Normenreihe EN 13914 legen Anforderungen an und Empfehlungen für die Detailausführung, für die Planung und die Auswahl der Materialien, für die Auswahl von Putzmischungen sowie für das Auftragen von Gips-Trockenmörtel, Gipskalk-Trockenmörtel, Leichtputz, Putzen auf Kalkgips , Kalk , Zement- und Kalkzementbasis, Lehmputze, Silikatputze, organisch gebundene Putze, polymermodifizierte Putze usw. fest.
Dieses Dokument ist nicht anwendbar für:
-   außen liegende Oberflächen;
-   Anstriche und/oder ihre Vorbereitung;
-   Imprägnierungen;
-   Betonerhaltungsarbeiten;
-   vorgefertigte faserverstärkte Innenputzelemente;
-   Oberflächenbehandlungen.
Aufgrund der zahlreichen unterschiedlichen Materialien, Arbeitsweisen und klimatischen Bedingungen ist es nicht möglich, zu bestimmten Gesichtspunkten dieser Norm genügend Einzelheiten anzugeben, um allen Anwendern umfassende Verwendbarkeit zu bieten.
ANMERKUNG   Sofern anwendbar, haben lokale oder nationale Bestimmungen Vorrang.

Conception, préparation et mise en oeuvre des enduits extérieurs et intérieurs - Partie 2: Enduits intérieurs

Le présent document traite des aspects liés à la conception ainsi que des principes essentiels des systèmes d’enduit interne et de la mise en œuvre de ces systèmes.
Les différentes parties de la série EN 13914 spécifient les exigences et recommandations relatives aux dispositions constructives, à la conception et aux matériaux utilisés, au choix des mélanges et à la mise en œuvre des plâtres pour enduit; des enduits à base de plâtre/chaux; des enduits allégés; de la chaux/du plâtre; des enduits à base de ciment et de ciment/chaux; des enduits à la chaux, à l’argile, aux silicates, organiques, modifiés avec des polymères.
Le présent document ne traite pas:
—   des finitions extérieures;
—   de la mise en peinture et/ou de la préparation;
—   des imprégnations;
—   de la remise en état des structures en béton;
—   des éléments d’enduit préfabriqués renforcés par des fibres;
—   les traitements de surface.
Sous certains aspects, la présente norme ne permet pas d’entrer suffisamment dans le détail pour être pleinement utilisable en raison de la grande variété de matériaux, de méthodes et des différentes conditions climatiques.
NOTE   Des réglementations nationales ou locales prévalent, le cas échéant.

Projektiranje, priprava in uporaba zunanjih in notranjih ometov - 2. del: Notranji ometi

Ta dokument obravnava načrtovalne vidike in bistvena načela za notranje ometne sisteme ter uporabo ometnih sistemov.
Različni deli serije standardov EN 13914 določajo zahteve in priporočila za podrobnosti, načrtovanje in izbiro materialov, izbiro mešanic ter uporabo mavčnih ometov, mavčno-apnenih ometov, lahkih ometov, apneno-mavčnih, cementnih in cementno-apnenih ometov, apnenih ometov, glinenih ometov, silikatnih ometov, organskih ometov, polimerno modificiranih ometov itd.
Ta dokument ne obravnava naslednjega:
-   zunanjih zaključkov;
-   pleskanja in/ali priprave;
-   impregnacij;
-   strukturnih popravil betona;
-   prefabriciranih vlaknasto ojačanih ometnih elementov;
-   obdelave površin.
Zaradi številnih različnih materialov, praks in različnih podnebnih pogojev ni mogoče, da bi nekateri vidiki standarda vstopili v dovolj podrobnosti, da bi bili v celoti uporabni za vse izvajalce.
OPOMBA   Lokalni ali nacionalni predpisi imajo prednost, kadar so uporabni.

General Information

• Status: Not Published
• Public Enquiry End Date: 23-Jul-2026
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: CAA - Mineral binders and masonry
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 10-Jun-2026
• Due Date: 28-Oct-2026
• Directive: Harmonized Standard305/2011 - 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
• Ref Project: prEN 13914-2 - Design, preparation and application of external rendering and internal plastering - Part 2: Internal plastering

Relations

• Revises: SIST EN 13914-2:2016 - Design, preparation and application of external rendering and internal plastering - Part 2: Internal plastering
• Effective Date: 28-Aug-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2026
Projektiranje, priprava in uporaba zunanjih in notranjih ometov - 2. del: Notranji
ometi
Design, preparation and application of external rendering and internal plastering - Part 2:
Internal plastering
Planung, Zubereitung und Ausführung von Außen- und Innenputzen - Teil 2: Innenputz
Conception, préparation et mise en oeuvre des enduits extérieurs et intérieurs - Partie 2:
Enduits intérieurs
Ta slovenski standard je istoveten z: prEN 13914-2
ICS:
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2026
ICS 91.100.10 Will supersede EN 13914-2:2016
English Version
Design, preparation and application of external rendering
and internal plastering - Part 2: Internal plastering
Conception, préparation et mise en oeuvre des enduits Planung, Zubereitung und Ausführung von Außen- und
extérieurs et intérieurs - Partie 2: Enduits intérieurs Innenputzen - Teil 2: Innenputz
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 125.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13914-2:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Essential principles and building programme . 12
4.1 Essential principles . 12
4.2 Building programme. 13
5 Materials . 13
5.1 General. 13
5.2 Factory-made and semi-finished factory-made plasters — properties . 13
5.2.1 General. 13
5.2.2 Gypsum plasters . 14
5.2.3 Lime, cement and lime/cement plasters . 14
5.2.4 Plasters with organic and/or silicate binders . 14
5.2.5 Clay plasters . 14
5.2.6 Renovation plaster . 14
5.3 Materials for site-made plasters . 14
5.3.1 General. 14
5.3.2 Mineral binders and clay . 15
5.3.3 Aggregates . 15
5.3.4 Admixtures for cement- and/or lime-based plasters . 15
5.3.5 Fibres . 15
5.4 Water . 15
5.5 Reinforcement, carriers and beads . 15
5.6 Fixings . 17
5.7 Substructures . 17
6 Design . 17
6.1 General. 17
6.2 Factors influencing the plastering system . 17
6.2.1 Design functions and properties of a plastering system . 17
6.2.2 Background characteristics as part of a plastering system . 18
6.2.3 Service conduits . 21
6.2.4 Compatibility of backgrounds and plaster coats . 22
6.2.5 Drying and hardening times . 22
6.3 Durability . 23
6.3.1 General. 23
6.3.2 Effects of moisture . 23
6.3.3 Corrosive effect on metals in contact with plasters . 24
6.3.4 Resistance to cracking. 24
6.3.5 Impact and abrasion resistance . 24
6.4 Thermal insulation . 24
6.5 Acoustic properties . 24
6.6 Plasters with enhanced resistance to soluble salts . 25
6.7 Plasters with enhanced protection from X-ray radiation . 25
6.8 Plastering system for decorative finish . 25
6.9 Thickness of plaster coats on walls and ceilings . 25
6.9.1 General purpose . 25
6.9.2 Solid backgrounds . 25
6.9.3 Boards . 26
6.9.4 Metal laths or welded wire meshes . 26
6.9.5 Service conduits and ducts . 27
6.9.6 Beads, depth beads and plastering templates. 27
6.10 Types and standards of plaster finish . 27
6.10.1 Types of finish . 27
6.10.2 Quality levels of smooth finishes . 27
6.10.3 Flatness of the plastered finish . 28
6.10.4 Verticality of the background and plastered finish . 28
6.10.5 Angularity . 28
6.11 Air tightness. 29
6.12 Condensation . 30
7 Work on site, preparation and application of plasters . 30
7.1 Storage . 30
7.2 Cleanliness and protection of the works . 30
7.3 Considerations by the designer for application matters . 30
7.3.1 General . 30
7.3.2 Preparatory treatment and pre-treatment . 31
7.3.3 Thickness of plastering system . 31
7.3.4 Smoothness of surface finish . 31
7.3.5 Flatness and angularity . 31
7.3.6 Drying/hardening . 31
7.4 Considerations for the applicator . 31
7.4.1 General . 31
7.4.2 Pre-treatment for gypsum plaster . 32
7.4.3 Pre-treatment for lime/cement and clay plaster . 32
7.4.4 Pre-treatment for organic plaster . 32
7.4.5 Pre-treatment of mixed backgrounds . 32
7.4.6 Dubbing-out . 32
7.4.7 One-coat system . 32
7.4.8 Multi-coat system . 32
8 Maintenance and repair (other than restoration). 33
8.1 General . 33
8.2 Inspection . 33
8.3 Efflorescence . 33
8.4 Repairs to cracks. 33
8.4.1 General . 33
8.4.2 Repairs to fine cracks and crazing in plasterwork only . 33
8.4.3 Repairs to wider cracks in plasterwork only . 34
8.4.4 Repairs to cracks in plasterwork and background . 34
Annex A (normative) Design considerations for work and acceptance of smooth plaster
finishes under aspects of lighting . 35
A.1 General . 35
A.2 Lighting — General recommendations . 35
A.3 Lighting generally falling perpendicular to the plaster surface . 35
A.4 Glancing light conditions. 35
A.5 Viewing conditions . 36
Annex B (informative) Methods of minimizing the occurrence of cracks . 37
B.1 General. 37
B.2 Movement/Joints . 37
B.3 Dissimilar backgrounds which cause differential movement . 37
Annex C (informative) Fixing applied backgrounds . 38
C.1 Fixing applied backgrounds in welded wire meshes or metal lath . 38
C.2 Metallic mesh for reinforcement . 38
C.3 Non-metallic mesh for reinforcement . 39
C.4 Beads and temporary formwork . 39
Annex D (informative) Restoration of plasters . 41
D.1 General. 41
D.2 Design . 41
D.3 Application . 41
Bibliography . 43
European foreword
This document (prEN 13914-2:2026) has been prepared by Technical Committee CEN/TC 125
“Masonry”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13914-2:2016.
This document includes the following significant technical changes with respect to EN 13914-2:2016:
a) update of normative references;
b) additions and revisions of terms;
c) revision of the content of all sections and all annexes.
The EN 13914 series consists of the following parts:
— EN 13914-1, Design, preparation and application of external rendering and internal plastering —
Part 1: External rendering;
— EN 13914-2, Design, preparation and application of external rendering and internal plastering —
Part 2: Internal plastering.
Introduction
For the purposes of this document (except where stated in relation to a specific product standard) the
term ‘strength’ should be considered in terms of relative strengths between different types of
backgrounds compared with the nominal strengths of prescribed plaster mixes. Although it can be
possible to consider this in terms of compressive strength, this standard deals with aspects of a craft as
opposed to design calculations. Therefore ‘strength’ is not considered in terms of numerical values
derived from testing. Similar considerations also apply to terms such as ‘movement’, ‘absorbency’ and
‘permeability’, etc. used in this document.
This document refers only to the technical suitability of materials and/or procedures. During the
application the user needs to observe any legal obligations relating to health and safety at any stage.
Because this document is a code-like document as opposed to the more conventional European product
standard, it is appropriate to mention that, as with product standards, the use of the verbal form ‘shall’
denotes a requirement for which verification of compliance has to be able to be demonstrated.
Recommendations are denoted by the verbal form ‘should’ and should be followed unless there is a
justifiable reason for not doing so.
It is not the function of this standard to assign responsibility for the design and application of any work
or actions mentioned within to any specific party. Such responsibility is a matter for other documentation
associated with the work, e.g. the contract.
It has been assumed in the drafting of this document that the application of its provisions is entrusted to
appropriately qualified and experienced people, for whose guidance it has been prepared.
1 Scope
This document deals with the design considerations and essential principles for internal plastering
systems and application of plastering systems.
The different parts of the EN 13914 series of standards specify requirements and recommendations for
detailing, design and material considerations, the selection of mixes and the application of gypsum
plasters, gypsum/lime plasters, lightweight plasters, lime/gypsum-, cement- and cement/lime-based
plasters, lime-based plasters, clay plasters, silicate plasters, organic plasters, polymer-modified plasters,
etc.
This document does not deal with the following:
— external finishes;
— painting and/or preparation;
— impregnations;
— structural repair of concrete;
— prefabricated fibre-reinforced plaster elements;
— surface treatments.
Because of the many varied materials, practices and different climatic conditions, it is not possible for
certain aspects of the standard to enter into sufficient detail to be fully usable by all practitioners.
NOTE Local or national regulations take precedence when applicable.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements
EN 413-1, Masonry cement — Part 1: Composition, specifications and conformity criteria
EN 459-1, Building lime — Part 1: Definitions, specifications and conformity criteria
EN 998-1:2016, Specification for mortar for masonry — Part 1: Rendering and plastering mortar
EN 1008, Mixing water for concrete — Specification for sampling, testing and assessing the suitability of
water, including water recovered from processes in the concrete industry, as mixing water for concrete
EN 10088-1, Stainless steels — Part 1: List of stainless steels
EN 10244-1, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 1: General
principles
EN 10244-2, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 2: Zinc or
zinc alloy coatings
EN 10346, Continuously hot-dip coated steel flat products for cold forming — Technical delivery conditions
EN 13055, Lightweight aggregates
EN 13139, Aggregates for mortar
EN 13279-1:2008, Gypsum binders and gypsum plasters — Part 1: Definitions and requirements
EN 15824, Specifications for external renders and internal plasters based on organic binders
EN ISO 16120-2, Non-alloy steel wire rod for conversion to wire — Part 2: Specific requirements for
general-purpose wire rod (ISO 16120-2)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
plaster
mixture of different materials (binders, additives, admixtures, water, aggregates) to obtain a surface
finish which is applied internally to walls and ceilings
3.2
plastering
application of plaster
Note 1 to entry: Plastering is used as a verb here.
3.3
factory-made plaster
plaster batched and mixed in a factory
3.4
gypsum plaster
all kinds of gypsum building plaster, gypsum-based building plaster and gypsum-lime building plaster
used in buildings
[SOURCE: EN 13279-1:2008, 3.2]
3.5
lime, cement or lime-cement based plaster
plaster with one or more inorganic binders
3.6
clay plaster
formulated plaster based on clay used in buildings
3.7
organic plaster
factory-made plaster with one or more organic binders in paste or powder form
3.8
thermal insulating plaster
plaster designed to improve the thermal efficiency of a building internally
3.9
designed plaster
plaster whose composition and manufacturing method is chosen by the producer in order to achieve
specified properties (performance concept)
Note 1 to entry: Designed plasters are used e.g. for renovation, acoustic properties and as protection against X-
ray radiation.
[SOURCE: EN 998-1:2016, 3.1.3.1, modified]
3.10
prescribed plaster
plaster made in pre-determined proportions, the properties of which are assumed from the stated
proportion of the constituents (recipe concept)
[SOURCE: EN 998-1:2016, 3.1.3.2, modified]
3.11
plaster coat
obtained by application of one or more layers with one or more mixes of the same product
3.12
plaster layer
layer produced by the application of the same plaster in one or more operations, “fresh on fresh”
3.13
plaster system
plaster coat or sequence of plaster coats to be applied to a background, including the possible use of a
support and/or reinforcement and/or pre-treatment
3.14
one coat plaster
plaster applied in one coat which fulfils all the functions of a plastering system
3.15
thin one coat plaster
2 mm to 6 mm mostly gypsum plaster coat applied to a surface
3.16
skim coat
plaster finish coat applied e.g. on gypsum or lime or clay plaster
3.17
reinforcement
material incorporated within a plaster coat to improve resistance to cracking (e.g. welded wire mesh,
glass fibre mesh, fibres)
[SOURCE: prEN 13914-1:2026, 3.16, modified]
3.18
reinforcing coat
polymer modified, mineral or organic plaster layer with a mesh embedded into it and applied over an
undercoat or defective background which contributes to the minimising of cracks
[SOURCE: prEN 13914-1:2026, 3.17, modified]
3.19
final coat
last coat, decorative or not, of a plaster system
[SOURCE: prEN 13914-1:2026, 3.18, modified]
3.20
background
surface of a construction element to which a plaster or a plaster system is to be applied
[SOURCE: prEN 13914-1:2026, 3.21, modified]
3.21
preparatory treatment
actions to be taken on backgrounds with devices, machines and/or tools, to remove dust and unstable or
deleterious material e.g. efflorescence
[SOURCE: prEN 13914-1:2026, 3.22]
3.22
key
property of a background or plaster coat which allows the bonding of a plaster without the need for a
pre-treatment or carrier
[SOURCE: prEN 13914-1:2026, 3.23, modified]
3.23
pre-treatment
application of a material on the background to improve the application properties of the plaster (e.g.
bonding agent, primer, spatterdash)
[SOURCE: prEN 13914-1:2026, 3.24, modified]
3.24
bond
mechanical and/or chemical adhesion between the plaster and the background
[SOURCE: prEN 13914-1:2026, 3.25, modified]
3.25
bonding agent
proprietary material used to provide or improve adhesion of the plaster or plaster system to the
background where necessary
[SOURCE: prEN 13914-1:2026, 3.26, modified]
3.26
primer
material for pre-treatment of the background
Note 1 to entry: For example primers can be used to reduce suction or to stabilize the surface of the background.
[SOURCE: prEN 13914-1:2026, 3.27]
3.27
spatterdash
technique for pre-treatment characterized by brushing, throwing or spraying of site or factory-made
mortar onto a background to improve its bonding properties and/or to regulate the suction of the
background
[SOURCE: prEN 13914-1:2026, 3.28]
3.28
dubbing out
process of filling large localized irregularities in the background, such as hollows, prior to the application
of a plaster coat
[SOURCE: prEN 13914-1:2026, 3.29, modified]
3.29
carrier
product attached to the background to which a plaster is applied so that the plaster system is largely
independent of the background (e.g. lathing)
[SOURCE: prEN 13914-1:2026, 3.30, modified]
3.30
crazing
network of short, irregular and very fine cracks up to approximately 0,2 mm in width
Note 1 to entry: Hairline cracks do not impair the function of the plaster and are therefore acceptable to a limited
extent.
[SOURCE: prEN 13914-1:2026, 3.32, modified]
3.31
depth gauge
band of plaster or bead used in setting out for a required thickness or evenness
[SOURCE: prEN 13914-1:2026, 3.33, modified]
3.32
drying time
necessary hardening- and drying- time until the next layer or coating can be applied
[SOURCE: prEN 13914-1:2026, 3.34]
3.33
lining
temporary frame for plastering up to
3.34
efflorescence
formation of salts on a surface during drying caused by the presence of soluble substances
[SOURCE: prEN 13914-1:2026, 3.35]
3.35
plaster stabilizer
coating/primer used to strengthen sandy, chalky or weathered plaster surfaces
3.36
post-treatment
any measures required after plaster application to ensure undisturbed strength development of the
plaster, e.g. keeping plaster surfaces moist
4 Essential principles and building programme
4.1 Essential principles
The design shall include drawings and specifications, e.g. quantities, prepared in detail to afford proper
guidance in the preparation of estimates and the execution of the work.
Prior to the commencement of the contract there should be an exchange of information between all
parties concerned.
When preparing the details the following points shall be taken into account:
a) nature and condition of the background, including any necessary preparatory treatment or pre-
treatment;
b) functional requirements;
c) type of plaster and other materials to be used in the plastering system. It is recommended that these
materials should conform to the appropriate documents where available and where not available
should conform to standards accepted in the place of use;
d) type of finish/appearance;
e) thickness required including:
1) the finished sizes and heights of rooms or other spaces;
2) details of the nature of the junctions with door frames, ceilings, linings, etc.;
3) the positioning of installations and fittings;
4) any other situations which can affect the plaster thicknesses;
f) information about the different building surfaces to receive the various types of cornices, corner
treatments, metal accessories (such as angles and beads), expansion joints, etc.;
g) work of other trades, particularly in connection with service pipes, conduits, wiring, etc. that are to
be covered by or buried in the plaster;
h) compatibility of the plaster with adjacent materials.
4.2 Building programme
In preparing a time schedule for the work involved in a building, each operation should be considered in
relation to the others.
Agreement shall be reached between all parties on the programme times for all necessary operations and
the correct sequence for carrying out these operations. The programme should be kept up-to-date as the
project proceeds and damage by subsequent trades should be avoided.
The following items shall be considered by those involved in planning the programme:
a) plastering should only commence in those parts of the building which are weather-tight;
b) time for the background to be completed and for all the preceding trades to be complete;
c) time for the background to be examined and to dry out;
d) background and air temperatures shall not rise above 30 °C or fall below 5 °C, except for silicate
plasters and lime plasters which shall not be used below 8 °C. Deviations from the temperature
specifications should only be made if special products are used that are expressly approved by the
manufacturer for other ambient conditions or if suitable measures are taken;
e) time for preparation of the background, application and drying out of each coat of plaster;
f) time for inspection and repair, if necessary;
g) time for the plaster to dry out prior to painting or other decoration;
h) avoidance of late changes/alterations;
i) prevent draughts; (windows should be installed);
j) avoid high relative humidity during drying process.
5 Materials
5.1 General
Plasters can be produced entirely in the factory, partly in the factory (semi-finished) or on site.
5.2 Factory-made and semi-finished factory-made plasters — properties
5.2.1 General
Factory-made and semi-finished factory-made plasters shall comply with the requirements of EN 998-1,
EN 13279-1 or EN 15824 for those parts of the process either wholly or partly carried out in the factory,
unless otherwise specified by the manufacturer. For those parts of the process for semi-finished factory-
made plasters completed on site, only materials permitted by the manufacturer shall be used. No addition
of any material is permitted for wet ready-to-use plasters. Unless otherwise specified by the
manufacturer, no addition, other than water in the recommended proportions, shall be added to dry
factory-made plasters. Only materials conforming to the requirements of 5.3 should be used. For clay
plaster see 5.2.5.
5.2.2 Gypsum plasters
For mixtures based on gypsum or gypsum and lime, factory-made and semi-finished factory-made
plasters shall conform to EN 13279-1 for those parts of the process either wholly or partly carried out in
the factory.
Gypsum plaster can be used in areas with no exposure to water or high levels of humidity, as this causes
weakening and disintegration. Gypsum undercoats should be sufficiently roughened to provide a key for
subsequent coats. For multi-coat gypsum plaster systems, it is not necessary to ensure that thorough
drying of one-coat has taken place before application of the following coat, but sufficient strength should
have developed.
5.2.3 Lime, cement and lime/cement plasters
For mixtures based on cement and/or lime, factory-made and semi-finished factory-made plasters shall
conform to EN 998-1 for those parts of the process either wholly or partly carried out in the factory. For
those parts of the process for semi-finished factory-made plasters completed on site, the materials should
conform to the recommendations of 5.3.
Depending on the materials of the plaster mix shrinkage can take place during the drying out process.
Cement and/or lime undercoats should be sufficiently roughened to provide a key for subsequent coats.
Each undercoat should be allowed to harden before applying the subsequent coat. As subsequent coats it
is possible to use e.g. gypsum smooth finish, clay smooth finish.
These plasters can also be polymer-modified.
5.2.4 Plasters with organic and/or silicate binders
These plasters harden essentially by physical drying; they shall comply with EN 15824.
The adhesion to different dry backgrounds including paints is usually sufficient.
Silicate plasters contain silicate and resin as binders. They shall conform to EN 15824. These plasters
harden chemically and by physical drying.
5.2.5 Clay plasters
Clay plasters harden by physical drying.
Clay plaster is manufactured using clay and mineral additives and if required fibre reinforcement. Clay
2 2
plasters can have strength characteristics, usually in the range from 1,5 N/mm to 3,0 N/mm , depending
on the manufacturer and raw materials. They need to be used in accordance with the manufacturer’s
recommendation.
Clay plaster can be used in areas with no exposure to water, as this causes weakening and disintegration.
Depending on the plaster mix, shrinkage can take place during the drying out process.
5.2.6 Renovation plaster
Renovation plasters are described in EN 998-1 with the abbreviation R. These are suitable
plasters for plastering damp masonry which can contain salt.
5.3 Materials for site-made plasters
5.3.1 General
Constituent materials with established suitability shall be used, as detailed in 5.3.2 to 5.3.5.
5.3.2 Mineral binders and clay
Mineral binders with established suitability shall be used. Binders shall conform to the relevant standards
listed in Table 1.
Table 1 — Mineral binders
Material Standard Remarks
Common cements EN 197-1
Not all types are
Masonry cements EN 413-1
suitable for each and
Building lime EN 459-1
every application
Gypsum binder EN 13279-1
Clay is not standardized and a suitability test has to be carried out.
5.3.3 Aggregates
Aggregates shall conform to EN 13139 for dense aggregates or EN 13055 for light aggregates, as
appropriate.
5.3.4 Admixtures for cement- and/or lime-based plasters
The admixtures used should conform to EN 934-3. However, admixtures falling outside the scope of
EN 934-3 can be used in accordance with the manufacturer’s instructions.
5.3.5 Fibres
Natural and synthetic fibres, that do not affect the chemical or physical stability of the plaster, may be
used either added on site or in premixed or factory-made plasters.
Fibres shall be dry, clean and free from oil or grease.
5.4 Water
Water used for plasters shall fulfil the requirements of EN 1008. Drinking or potable water is suitable.
5.5 Reinforcement, carriers and beads
Reinforcement, carriers and beads should conform to the recommendations given in Table 2.
Plastic beads can be used if they comply with the manufacturer’s recommendation.
Table 2 — Materials for reinforcement, carriers and beads
Product Material Related standard Remarks
Reinforcement Glass fibre mesh EN 13496 Alkali-resistant glass fibre mesh can be used
for all types of plaster. The use of non-
alkali-resistant glass fibre mesh is not
suitable for products containing cement
and/or lime.
The minimum mesh size to be used should
correspond to the type of plaster used (e.g.
4 mm × 4 mm).
For plasters with a grain size of less than
1 mm the mesh size should be not less than
2,5 mm × 2,5 mm.
Expanded metal EN 13658-1 Stainless steel in accordance with
(stainless steel or zinc- EN 10088-1 (austenitic steel)
coated steel)
Zinc-coated steel in accordance with
plain or profiled welded EN ISO 16120-2 and EN 10346
wire mesh (stainless
The square mesh should be not less than
steel or zinc coated)
12 mm and not more than 50 mm with
wires not less than 0,7 mm.
Where the aggregate grain size exceeds
3 mm the use of a mesh larger than 15 mm
should be considered.
Carrier Profiled wire lath EN 13658-1 Profiled wire lath – in longitudinal direction
(stainless steel or zinc- or evenly distributed indentations to
coated steel) provide rigidity and easy fixing to the
background
Stainless steel clay lath —
Expanded metal Stainless steel in accordance with
(stainless steel or zinc- EN 10088-1 (austenitic steel)
coated steel)
Zinc-coated steel in accordance with
EN ISO 16120-2 and EN 10346
Profiled welded wire
mesh (stainless steel or
zinc-coated)
Reed mat — Used for lime and clay plaster in work on
conservation projects
Timber lathing —
Beads (e.g. Stainless steel and zinc EN 13658-1 Stainless steel in accordance with
corner beads) coated steel EN 10088-1 (austenitic steel)
Zinc-coated steel in accordance with
EN ISO 16120-2 and EN 10346
Plastic and plastic — —
coated steel products
Other products and/or techniques can be used.
Metal lathing, reinforcement and beads of whatever type shall be suitable for internal use. Careful
consideration should be given to the choice of the material for its use in typical applications in wet areas,
e.g. commercial kitchens, see also Annex C.
5.6 Fixings
Consideration should be given to the corrosion resistance of beads fixed with mortar.
It is recommended that mortar systems be used with the same binder system and not to mix e.g. gypsum
with cement.
If the beads, lathing or reinforcement are mechanically fixed with nails, screws or staples, attention shall
be given to the compatibility of the fixing with the bead, lathing or reinforcement.
The fixings shall be in accordance with EN 10088-1 (austenitic steel) if stainless steel is used and with
EN ISO 16120-2, EN 10346, EN 10244-1 and EN 10244-2 if zinc-coated steel is used.
5.7 Substructures
Substructures can consist of galvanized steel, stainless steel or timber. The carrier is fixed to the
substructure in order to receive the plaster. Substructures shall be of sufficient strength so that the
carrier and the plaster applied to the carrier are both held rigidly. Careful consideration should be given
to the choice of the material for its use in typical applications in wet areas, e.g. commercial kitchens.
6 Design
6.1 General
This section gives general advice.
6.2 Factors influencing the plastering system
6.2.1 Design functions and properties of a plastering system
A plasteri
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