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Description
This document is intended for use by the building design team, building envelope designers and building inspectors. It allows the early estimation of building envelope U-values, details the information required and describes methods for showing compliance of the final building envelope design with the requirements of Parts L-2A and L-2B of the Building Regulations 2010. It is expected that similar provision will be included in the Building Regulations for Scotland and Northern Ireland in due course.
Advice is given on which calculation methods are relevant to different types of construction. These include:
Stick curtain walling
Unitised and panellised walls
Rainscreen wall
Insulated panel walls
Window assemblies
The appendices show how detailed calculations should be undertaken to establish component U-values and the properties of their associated thermal bridges, and how these should be incorporated into a detailed calculation of the equivalent U-value of a zone of the building envelope.
Finally, the document shows how the equivalent U-value of a zone of building envelope may be used as an input into software that models building energy use.
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