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Thermal resistance and thermal transmittance — Calculation method (ISO 6946:2007)

Thermal
resistance and thermal
transmittance —
Calculation method
(ISO 6946:2007)

This International Standard provides the method of calculation of the thermal resistance and thermal
transmittance of building components and building elements, excluding doors, windows and other glazed units,
curtain walling, 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 for the application concerned.
The method applies to components and elements consisting of thermally homogeneous layers (which can
include air layers).
This International Standard also provides an approximate method that can be used for elements containing
inhomogeneous layers, including the effect of metal fasteners, by means of a correction term given in
Annex D. Other cases where insulation is bridged by metal are outside the scope of this International
Standard.

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