E04D 11/002

Roof covering, as far as not restricted to features covered by only one of groups [CPC: E04D1/00] - [CPC: E04D9/00]; Roof covering in ways not provided for by groups [CPC: E04D1/00] - [CPC: E04D9/00], {e.g. built-up roofs, elevated load-supporting roof coverings consisting of two or more layers, at least one of the layers permitting turfing of the roof}