CEN/TR 15125:2005

SLOVENSKI STANDARD
01-september-2005
1DþUWRYDQMHSULSUDYDLQXSRUDEDQRWUDQMLKFHPHQWQLKLQDOLDSQHQLKRPHWRY
Design, preparation and application of internal cement and/or lime plastering systems
Planung, Zubereitung und Ausführung von Kalk-, Zement- und Kalkzement-
Innenputzsystemen
Ta slovenski standard je istoveten z: CEN/TR 15125:2005
ICS:
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
91.180 1RWUDQMD]DNOMXþQDGHOD Interior finishing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 15125
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
June 2005
ICS 91.100.10; 91.180
English version
Design, preparation and application of internal cement and/or
lime plastering systems
Planung, Zubereitung und Ausführung von Kalk-, Zement-
und Kalkzement-Innenputzsystemen
This Technical Report was approved by CEN on 13 May 2005. It has been drawn up by the Technical Committee CEN/TC 125.
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. CEN/TR 15125:2005: E
worldwide for CEN national Members.

Contents
Page
Foreword. 3
1 Scope. 4
2 Normative references. 4
3 Terms and definitions . 4
4 Materials and accessories . 6

5 Design – factors influencing the selection of cement and/or lime plastering
systems . 8
6 Characteristics of cement and/or lime plastering systems. 10
7 Types and standards of plaster finish . 17
8 Backgrounds, including preparation .18
9 Preparation and application of cement and/or lime plasters . 23
10 Maintenance and repair (other than restoration of old and historic buildings). 24
11 Specific recommendations relating to plasters containing cement and/or lime as
the principal binder . 26
Annex A (informative) Fixing applied backgrounds . 28
Annex B (informative) Restoration of plasters on old and historic buildings . 31
Bibliography . 35

Foreword
This document (CEN/TR 15125:2005) has been prepared by Technical Committee CEN/TC 125
"Masonry", the secretariat of which is held by BSI.
This document has been initially prepared by the European section of International Union of
Contractors of Plastering, Dry Lining, Stucco and Related Activities (UIEP) at the request of the
CEN Technical Sector Board (Resolution No.BTS1/56/1991). It has been revised by
CEN/TC125/JWG5 in conjunction with CEN/TC 241.
It is not the function of this document 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.
This TR should be read in conjunction with EN 13914-2.
The following similar Technical Reports are also available:-
CEN/TR 15123:2005 Design, preparation and application of internal polymer plastering systems
CEN/TR 15124:2005 Design, preparation and application of internal gypsum plastering systems.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to announce this Technical Report: 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 the United Kingdom.

1 Scope
This document concerns the design, preparation and application of internal plaster and plastering
systems based on cement and/or lime for internal plastering on all types of background used under
normal conditions. It includes plastering onto both new and old backgrounds and the maintenance
and repair of existing work. It concerns materials, backgrounds, preparation of the surface to be
plastered, choice of suitable cement and/or lime plastering system, methods of application and
inspection and testing of plastering.
Cement and/or lime plastering mixes with special properties intended to enhance thermal insulation,
fire resistance, acoustic insulation and to increase radiation absorption are also covered.
Because of the many and varied materials and practices in Europe it is not possible for certain
aspects of the standard to enter into sufficient detail to be fully usable to practitioners in each country.
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 998-1, Specification for mortar for masonry — Part 1: Rendering and plastering mortar
EN 13914-2, Design, preparation and application of external rendering and internal plastering - Part 2:
Design considerations and essential principles for internal plastering
3 Terms and definitions
For the purposes of this document, the terms and definitions in EN 13914-2 and the following apply.
3.1
plaster
mixture based on one or more binders, that is applied while plastic and that hardens after application,
used to obtain an internal surface finish. It does not acquire its final characteristics until it has set on
the building component
3.2
mineral plaster
mixture of aggregates, additives, admixtures and one or more binders
3.3
cement and/or lime plaster coat
obtained by application of one or more layers with one or more mixes of the same product
3.4
cement and/or lime plaster layer
cement and/or lime plaster applied wet on wet to obtain the final thickness with one or more mixes of
the same product, when all operations are completed before the cement and/or lime plaster has set
3.5
designed plaster
plaster designed and manufactured to fulfil stated properties and subjected test requirements
(performance concept)
3.6
prescribed plaster
plaster made in predetermined proportions the properties of which are assumed from the stated
proportions of the constituents (recipe concept)
3.7
plastering
application of plaster
3.8
plastering system
plaster coat or sequence of plaster coats applied to a background, including the possible use of a
support and/or reinforcement and/or pretreatment
3.9
undercoats
lower plaster coat or plaster coats of a plastering system
3.10
final coat
last plaster coat of a multicoat plastering system
3.11
dubbing out
process of filling large localized irregularities in the background, such as hollows, prior to the
application of an undercoat
3.12
one coat plaster
plaster applied in one coat which fulfils all the functions of a plastering system
3.13
background
surface of a construction element to which a plastering system is to be applied
3.14
reinforcement
material incorporated within a plaster coat to improve resistance to cracking (e.g. mesh)
3.15
support
product attached to the background to which a plaster is applied so that the plastering system is
largely independent of the background (e.g. lathing)
3.16
bonding agent
proprietary material used to provide adhesion of the plastering system to the background where
necessary
3.17
spatterdash and stipple
pretreatments to prepare a background for plastering. They do not form a coat in the plastering
system
NOTE Stipple is only used in the form of site plaster.
3.18
lining
true representation of a frame which was to be plastered up to e. g. doors, frames
3.19
depth gauge
mortar screed or metal bead used in setting for a required thickness
3.20
crazing
network of short, irregular and very fine cracks up to approximately 0,2 mm in width. Hairline cracks
do not impair the function of the plaster and are therefore acceptable to a limited extent
4 Materials and accessories
4.1 Materials for site-made plasters
4.1.1 Binders
4.1.1.1 Common cements including coloured cement
Common cements, which include coloured and pigmented cements, should conform to the
requirements of EN 197-1. It should, however, be noted that not all types and classes will be suitable
for each and every application.
4.1.1.2 Masonry cement
Masonry cement should conform to the requirements of EN 413-1.
4.1.1.3 Sulphate resistant cements
Sulphate resisting cements should conform to the requirements of relevant national standards or
provisions valid in the place of use of the plaster until a European Standard (EN 197) for sulphate
resisting cements is available.
4.1.1.4 Lime
Building lime should conform to the requirements of EN 459-1.
4.1.2 Aggregates
Aggregates should conform to the requirements of EN 13139 or EN 13055-1 as appropriate. Other
aggregates may be used which do not exert a harmful influence on the plaster.
4.1.3 Admixtures for cement and /or lime based plasters
Where available admixtures should conform to the requirements of EN 934-3.
Only those admixtures should be used which do not exert any harmful influence on the plaster. They
should not impair the strength or durability of the plaster and where applicable, the protection against
corrosion of the reinforcement or lathing. In addition they should not modify, other than in the manner
intended, the setting or hardening of the binder.
With all admixtures it is essential that the manufacturers instructions should be precisely followed.
Overdosage should be avoided.
4.1.4 Additions
4.1.4.1 Bonding agents
Only bonding agents with a proven performance should be used. With all bonding agents it is
essential that the manufacture's instructions should be precisely followed.
4.1.4.2 Pigments
Pigments should comply with the requirements of EN 12878. Other pigments should be used only if
they are known to be satisfactory.
4.1.4.3 Fibres
Fibres can be used in specialised applications such as restoration work, sprayed plasterings and
plasterings on lathing or insulation board.
The fibres should not affect the chemical or physical stability of the plaster.
4.2 Water
The water should be of a quality such that it does not adversely affect the plaster.
Water fit for drinking is suitable for mixes for plastering. Attention is drawn to the requirements of
EN 1008 in cases where water supplies may be of doubtful quality.
4.3 Types of plaster
4.3.1 General
Ready mixed plasters can be mixed entirely in the factory or partly in the factory and then completed
on site. Alternatively plaster may be mixed entirely on site.
4.3.2 Factory made and semi-finished factory made plasters
For mixes based on cement and/or lime, factory made and semi-finished factory made plasters should
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 4.1 and 4.2.
4.3.3 Site made plasters
4.3.3.1 General
Site made plasters should be made from constituents given in 4.1 and 4.2 and mixed in accordance
with 9.2 with the correct proportions (see 9.1).
4.3.3.2 Site made, designed mixes
It is recommended that such mixes should not normally be made on site unless the contractor has
taken special measures to exercise the necessary degree of control.
4.3.3.3 Site made, prescribed mixes
These mixes should be made by batching the specified binders and aggregates in appropriate
proportions. These proportions are not given in this document. Other than ensuring and checking that
these mixes are correctly batched prescribed mixes are not required to meet any test criteria.
NOTE It is recommended that other documentation should give a range of different mix proportions to
produce a range of plasters of different strengths. This will provide suitable products for backgrounds of differen
...