Part 2 of this standard sets out the specifications on a 2-D geometrical model of a linear thermal bridge for the numerical calculation of the linear thermal transmittance of the linear thermal bridge and the lower limit of the minimum surface temperatures.

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Part 1 of this standard sets out the specifications on a 3-D and 2-D geometrical model of a thermal bridge for the numerical calculation of: - heat flows in order to assess the overall heat loss from a building; - minimum surface temperatures in order to assess the risk of surface condensation. These specifications include the geometrical boundaries and subdivisions of the model,the thermal boundary conditions and the thermal values and relationships to be used.

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This standard deals with simplified methods for determining heat flows through discrete linear thermal bridges which occur at junctions of building elements. It is not applicable to thermal bridging associated with window and door frames or curtain walling. It specifies requirements relation to thermal bridges catalogues and manual calculation methods, and provides a limited number of tabulated default values of linear thermal transmittances.

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    26 pages
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Frequently Asked Questions

CEN/TC 89/WG 1 is a Working Group within the European Committee for Standardization (CEN). It is named "Thermal bridges and surface condensation" and is responsible for: To draft standards on calculation methods for evaluation of thermal bridges and assessment of the possibility of surface condensation. This committee has published 3 standards.

CEN/TC 89/WG 1 develops CEN standards. The scope of work includes: To draft standards on calculation methods for evaluation of thermal bridges and assessment of the possibility of surface condensation. Currently, there are 3 published standards from this working group.

The European Committee for Standardization (CEN) is a public standards organization that brings together the national standardization bodies of 34 European countries. CEN provides a platform for developing European Standards (ENs) and other technical documents in relation to various products, materials, services, and processes, supporting the European Single Market.

A Working Group in CEN is a specialized group responsible for developing standards or technical work within a defined scope. These bodies bring together international experts to create consensus-based standards that support global trade, safety, and interoperability.