BRE BR 443 PDF

'Conventions for U-value calculations' guides the architect and specifier for calculating U-values by:

- indicating the methods of calculation appropriate for different construction elements: roofs, walls, floors, basements, windows and doors

- providing further information about using the methods

- providing data relevant to typical UK constructions.

Particular guidance is given on thermal conductivity of materials, and on various issues commonly arising when calculating U-values and how they apply to different construction types.

This 2006 edition of the guide is fully updated in line with Part L of the Building Regulations that came into effect in April 2006.