Flexible sheets for waterproofing. Reinforced bitumen sheets for roof waterproofing. Definitions and characteristics|Conformity, Bituminous products, Physical properties of materials, Sheet roof coverings, Fire resistance, Marking, Technical data sheets, Type testing, Acceptance (approval), Weather protection systems, Quality control, Bitumens, Mechanical properties of materials, Construction materials, Roof coverings, Flexible materials, Chemical-resistant materials, Reinforced materials, Bituminous felts, Roofing felts