specially modified, e.g. perforated, with granulated surface, with attached pads

Full Title

Roof covering by making use of flexible material, e.g. supplied in roll form (using stiff sheets E04D3/00; gravelling of flat roofs E04D7/00 ; built-up roofs E04D11/02) > specially modified, e.g. perforated, with granulated surface, with attached pads