oSIST prEN 18266:2026
(Main)Determination of Point thermal transmittance of one plate or spiral anchor in the ETICS kit
Determination of Point thermal transmittance of one plate or spiral anchor in the ETICS kit
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.
Bestimmung des punktbezogenen Wärmedurchgangskoeffizienten von Teller- oder Spiraldübeln in WDVS-Kit
Dieses Dokument gilt für die Bestimmung des punktbezogenen Wärmedurchgangskoeffizienten χ eines Dübels bei unterschiedlichen Dicken des Dämmstoffs. Grundlage hierfür ist die Berechnung nach den Normen EN ISO 10211 und EN ISO 6946.
Dieses Dokument wurde für Anwendungen in Gebäuden erstellt, kann aber auch in anderen Bereichen verwendet werden, in denen es relevant ist.
Détermination du coefficient ponctuel de transmission thermique d’une cheville à rosace ou hélicoïdale dans le kit ETICS
Le présent document s’applique à la détermination du coefficient ponctuel de transmission thermique χ d’une cheville pour différentes épaisseurs d’isolant. Il s’appuie sur les calculs des normes EN ISO 10211 et EN ISO 6946.
Le présent document a été rédigé pour des applications dans le bâtiment, mais il peut également être utilisé dans d’autres domaines, le cas échéant.
Ugotavljanje točkovne toplotne prehodnosti ploščatih ali spiralnih sidrnih elementov v kompletu ETICS
General Information
- Status
- Not Published
- Public Enquiry End Date
- 22-Jan-2026
- Technical Committee
- TOP - Thermal insulation
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 28-Nov-2025
- Due Date
- 17-Apr-2026
- Completion Date
- 20-Mar-2026
Overview
oSIST prEN 18266:2026 is a prospective European standard developed by SIST, focused on the determination of point thermal transmittance (χ) of one plate or spiral anchor in the ETICS kit. ETICS (External Thermal Insulation Composite Systems) is widely used in building envelopes for energy efficiency and thermal protection. This standard provides a clear calculation method for evaluating the local effect of single anchors-such as plate or spiral anchors-on the overall thermal performance of insulated wall assemblies. The methodology is grounded in established calculation standards, specifically EN ISO 10211 and EN ISO 6946.
Key Topics
- Point Thermal Transmittance (χ): Quantification of heat transfer through a singular anchor, considering various insulation thicknesses.
- Reference Wall Assemblies: Standardized specimen configurations with defined layers (plaster, substrate, insulation, render) and their physical properties.
- Calculation Principles: Use of finite element analysis per EN ISO 10211 for accurate three-dimensional heat transfer simulation.
- Material Parameters: Specification of material types, thermal conductivity, and the geometric properties of anchors as referenced in EN ISO 10456.
- Boundary and Test Conditions: Determination settings such as temperature gradients, adiabatic edge conditions, and anchor positioning within wall assemblies.
- Reporting Requirements: Comprehensive documentation of all relevant test parameters, anchor and insulation data, calculation details, and results.
Applications
This standard is particularly relevant for:
- Building Envelope Design:
- Enables designers and façade engineers to anticipate the thermal bridging impact of anchors in ETICS systems.
- Supports energy-efficient construction by facilitating the selection of anchoring systems with minimal adverse effects on wall U-values.
- Thermal Performance Assessment:
- Provides manufacturers, testing laboratories, and quality assurance teams with a harmonized calculation method for evaluating point thermal transmittance per European requirements.
- Assists regulatory compliance regarding national and EU building energy efficiency directives.
- System Optimization:
- Beneficial for ETICS manufacturers seeking to optimize anchor design and placement, balancing structural stability and thermal performance.
- Allows for the comparison of different anchor types (plate versus spiral) and configurations under standardized conditions.
- Research & Development:
- Supports thermal analysis for innovative facade systems and advanced insulation materials.
Related Standards
Related standards referenced in oSIST prEN 18266:2026 for calculation methods and definitions include:
- EN ISO 10211:
Thermal bridges in building construction - Heat flows and surface temperatures - Detailed calculations. - EN ISO 6946:
Building components and building elements - Thermal resistance and thermal transmittance - Calculation method. - EN ISO 10456:
Building materials and products - Hygrothermal properties - Tabulated design values and procedures for determining declared and design thermal values. - EN ISO 9229:
Thermal insulation - Vocabulary. - EN 17237:
Thermal insulation products for buildings - ETICS with renders - Specification.
Practical Value
oSIST prEN 18266:2026 delivers substantial practical value by:
- Providing a scientific and consistent method for assessing point heat losses through anchors, supporting energy optimization in building façades.
- Ensuring that ETICS systems are designed and assessed using reliable and comparable data across projects and manufacturers.
- Facilitating regulatory acceptance and market access for ETICS products in European and international markets as energy performance standards become more stringent.
- Enabling comprehensive reporting and documentation, thus supporting transparency, traceability, and quality assurance in construction projects.
By applying this standard, stakeholders in the construction industry can effectively manage and minimize thermal bridging, contributing to sustainability goals and improved building performance.
Get Certified
Connect with accredited certification bodies for this standard
DIBt (Deutsches Institut für Bautechnik)
German Institute for Building Technology.
DIN CERTCO
DIN Group product certification.
Aboma Certification B.V.
Specialized in construction, metal, and transport sectors.
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Frequently Asked Questions
oSIST prEN 18266:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Determination of Point thermal transmittance of one plate or spiral anchor in the ETICS kit". This standard covers: 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.
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.
oSIST prEN 18266:2026 is classified under the following ICS (International Classification for Standards) categories: 91.040.99 - Other buildings; 91.100.60 - Thermal and sound insulating materials. The ICS classification helps identify the subject area and facilitates finding related standards.
oSIST prEN 18266:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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:
— ISO Online browsing plat
...