TGD L 2011 – 2.1.1.2 – BUILDING FABRIC General

2.1.1.2 This Part of the Building Regulations applies to the replacement of external doors, windows, or rooflights in an existing building. The average U-value of replacement units should not exceed the value of 1.6 W/m2K set out in Table 5. In this context, the repair or renewal of parts of individual elements, e.g. window glass, window casement sash, door leaf, should be considered as repair and not replacement.

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