prEN 18266

SLOVENSKI STANDARD
01-januar-2026
Ugotavljanje točkovne toplotne prehodnosti ploščatih ali spiralnih sidrnih
elementov v kompletu ETICS
Determination of Point thermal transmittance of one plate or spiral anchor in the ETICS
kit
Bestimmung des punktbezogenen Wärmedurchgangskoeffizienten von Teller- oder
Spiraldübeln in WDVS-Kit
Détermination du coefficient ponctuel de transmission thermique d’une cheville à rosace
ou hélicoïdale dans le kit ETICS
Ta slovenski standard je istoveten z: prEN 18266
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2025
ICS 91.040.99
English Version
Determination of Point thermal transmittance of one plate
or spiral anchor in the ETICS kit
Détermination du coefficient ponctuel de transmission Bestimmung des punktbezogenen
thermique d'une cheville à rosace ou hélicoïdale dans Wärmedurchgangskoeffizienten von Teller- oder
le kit ETICS Spiraldübeln in WDVS-Kit
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 88.
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18266:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions, symbols and units . 4
3.1 Terms and definitions . 4
3.2 Symbols and units . 4
4 Principles . 5
5 Calculation method . 5
6 Calculation object . 5
6.1 General. 5
6.2 Dimensions of the test specimen . 5
6.3 Numbers of calculation objects . 5
7 Reference construction . 6
7.1 General. 6
7.2 Consideration of anchor properties . 8
7.3 Boundary conditions . 8
8 Procedure . 9
9 Calculation and expression of results . 9
9.1 Calculation of the point thermal transmittance . 9
9.2 Subdivision of the system . 9
9.3 Determination of the thermal transmittance . 9
10 Test Report . 10
Bibliography . 11

European foreword
This document (prEN 18266:2025) has been prepared by Technical Committee CEN/TC 88 “Thermal
insulating materials and products”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
1 Scope
This document is applicable for the determination of the point thermal transmittance χ of one anchor for
different insulation thicknesses. It is based on the calculation of the standards EN ISO 10211 and
EN ISO 6946.
This document has been drafted for applications in buildings, but can also be used in other areas where
it is relevant.
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 ISO 6946, Building components and building elements — Thermal resistance and thermal transmittance
— Calculation methods
EN ISO 9229, Thermal insulation — Vocabulary
EN ISO 10211:2017, Thermal bridges in building construction — Heat flows and surface temperatures –
Detailed calculations
EN ISO 10456:2007, Building materials and products — Hygrothermal properties — Tabulated design
values and procedures for determining declared and design thermal values
3 Terms and definitions, symbols and units
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 9229 and EN 17237 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:

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