Definition of thermal element renovation

The renovation of a thermal element is defined as "the provision of a new layer to a thermal element or the replacement of an existing layer (other than where a partial replacement layer is provided solely as a means of patch repair to a flat roof) but does not include thin decorative surface finishes". However, the following renovation works require the thermal element to be upgraded in accordance with paragraphs 3.58 to 3.60 – (a) cladding or rendering the external surface of a thermal element; (b) dry lining the internal surface of a thermal element; (c) stripping down the element to expose the basic structure (brick/blockwork, timber/metal frame, joists, rafters, etc.) and rebuilding; or (d) replacing the waterproof membrane on a flat roof. Note – Windows and doors are excluded from the definition of a thermal element.