Technical Booklet F1 Conservation of Fuel and Power in Dwellings·Page 9
Definitions: Renovation of a thermal element
Renovation of a thermal element means providing a new layer or replacing an existing layer (but not partial patch repairs to flat roofs), and does not include thin decorative surface finishes.
"Renovation of a thermal element" means 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;
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet F1 - Conservation of Fuel and Power in Dwellings.pdf