DIN EN ISO 6946 2018-03 PDF

Full title and description

DIN EN ISO 6946:2018-03 — Building components and building elements — Thermal resistance and thermal transmittance — Calculation methods. German version of EN ISO 6946:2017; provides the calculation procedures used to determine thermal resistance (R) and thermal transmittance (U) for building components (excluding glazed units, components transferring heat to ground and purposely ventilated elements).

Abstract

Specifies methods to calculate the thermal resistance and thermal transmittance of building components and elements composed of thermally homogeneous and layered materials. Offers procedures for homogeneous and approximate methods for certain inhomogeneous cases (with guidance on corrections for thermal bridges such as metal fasteners). Excludes doors/windows/glazed units, components with designed air permeability and components involving heat transfer to ground.

General information

• Status: Current (German adoption of EN ISO 6946:2017; replaces DIN EN ISO 6946:2008-04).
• Publication date: 2018-03 (issued 1 March 2018).
• Publisher: Deutsches Institut für Normung (DIN) — German version of EN ISO 6946:2017 / ISO 6946:2017.
• ICS / categories: 91.120.10 (Thermal insulation of buildings).
• Edition / version: DIN EN ISO 6946:2018-03 (German version of ISO 6946:2017, Edition 3).
• Number of pages: 62 (German publication length; ISO original edition 2017 references show the international edition length separately).

Correction: the DIN version has been subject to a published correction (Berichtigung) in 2023.

Scope

Gives the calculation method for thermal resistance (R) and thermal transmittance (U) of building components and building elements formed from homogeneous or layered materials. The standard provides input data guidance, surface and airspace resistances, procedures for tapered layers and an approximate correction for certain inhomogeneous cases (e.g., insulation bridged by metal). It does not cover doors, windows and other glazed units, curtain walling, components transferring heat to the ground or elements designed to be air-permeable.

Key topics and requirements

• Calculation of thermal resistance (R) and thermal transmittance (U-value) for layered and homogeneous components.
• Definition and use of design thermal conductivities and design thermal resistances for materials and products.
• Normative values for surface resistances and airspace thermal resistance procedures.
• Methods for tapered layers and guidance for components containing inhomogeneous layers.
• Approximate correction for thermal bridges caused by metal fasteners (Annex F) and notes on cases outside scope.
• Templates and input/method-selection data sheets for consistent calculations (Annex A–B, normative/ informative annexes).

Typical use and users

Used by architects, building services and envelope designers, thermal and energy consultants, manufacturers of building materials, certification bodies, test houses and regulatory authorities to calculate U-values and R-values for compliance, energy performance calculations, hygrothermal assessment and product declarations. Also used in standards-based energy modelling, building code compliance and product data sheet preparation.

Related standards

Commonly referenced alongside other building thermal and hygrothermal standards, for example ISO 10077 (thermal performance of windows and frames), ISO 10211 (thermal bridges—detailed calculations), ISO 13370 (heat transfer via the ground), ISO 13788 (internal surface temperature and condensation), ISO 13789 (transmission and ventilation heat transfer coefficients) and ISO 10456 (tabulated hygrothermal properties and design values). National and regional EN/ISO adoptions often list these as companion documents.

Keywords

thermal resistance, thermal transmittance, R-value, U-value, heat transfer, building components, thermal bridges, calculation method, surface resistance, ISO 6946, DIN EN ISO

FAQ

Q: What is this standard?

A: It is the German adoption (DIN EN ISO 6946:2018-03) of the international standard ISO 6946:2017 specifying calculation methods for the thermal resistance and thermal transmittance of building components and elements.

Q: What does it cover?

A: Calculation procedures for R and U values of layered and homogeneous building components, normative surface resistances, airspace resistance methods, tapered layer calculations and an approximate correction for certain inhomogeneous thermal bridges; excludes glazed units, elements transferring heat to ground and purposely ventilated components.

Q: Who typically uses it?

A: Architects, energy/thermal consultants, product manufacturers, test laboratories, building code/approval authorities and anyone performing U-value or R-value calculations for building elements.

Q: Is it current or superseded?

A: The DIN adoption published in March 2018 implements ISO 6946:2017; it replaced earlier DIN EN ISO 6946 editions (2008 and prior). The DIN text has an issued correction (Berichtigung) in 2023 — users should verify they have the corrected edition.

Q: Is it part of a series?

A: Yes — ISO 6946 sits within the suite of building thermal performance and energy performance of buildings (EPB) related standards and is commonly used together with standards such as ISO 10077, ISO 10211, ISO 13370, ISO 13788 and ISO 13789 for comprehensive thermal and hygrothermal assessments.

Q: What are the key keywords?

A: Thermal resistance, thermal transmittance, U-value, R-value, heat transfer, building components, thermal bridges, calculation method, surface resistance, ISO 6946.