This standard gives the method of calculation of the thermal resistance and thermal transmittance of building components and building elements, excluding doors, windows and other glazed units, components which involve heat transfer to the ground, and components through which air is designed to permeate.
The calculation method is based on the appropriate design thermal conductivities or design thermal resistances of the materials and products involved.
The method applies to components and elements consisting of thermally homogeneous layers (which can include air layers).
The standard also gives an approximate method that can be used for inhomogeneous layers, except cases where an insulating layer is bridged by metal.
BS EN ISO 6946:1997 history
2022BS EN ISO 6946:2017 Building components and building elements. Thermal resistance and thermal transmittance. Calculation methods
2008BS EN ISO 6946:2008 Building components and building elements. Thermal resistance and thermal transmittance. Calculation method
2008BS EN ISO 6946:2007 Building components and building elements - Thermal resistance and thermal transmittance - Calculation method
1997BS EN ISO 6946:1997 Building components and building elements - Thermal resistance and thermal transmittance - Calculation method