The previous definition related to adding a new layer as part of a repair to existing flat roofs over 25% which triggered the Part l upgrading expectation.
The Building (Amendment) Regulations 2011 now make it clear that where flat roofs are repaired by the addition of a layer to the existing layers over 25% of the roof area will NOT require an upgrade to the thermal properties.
A repair of this nature will no longer fall within the definition of 'building work' in Regulation 3 (1) of the Building Regulations. It will not be notifiable building work.
They also make it clear these changes do not affect the upgrading expectation relating to pitched roofs or where flat roofs are altered by the removal and replacement of layer(s).
Comes into effect 15th July 2011.
In addition a new category of the Competence Persons Scheme relating to replacement windows, rooflights and doors within buildings that are NOT dwellings. There are some exceptions such as load-bearing glass, display windows, glazed curtain walling and revolving glass doors.