This British Standard specifies requirements for reinforced bitumen roofing sheets intended for use in the British Isles and countries with similar climate.
BS 747:2000 history
2013BS EN 13707:2013 Flexible sheets for waterproofing. Reinforced bitumen sheets for roof waterproofing. Definitions and characteristics
2005BS EN 13707:2004+A2:2009 Flexible sheets for waterproofing - Reinforced bitumen sheets for roof waterproofing - Definitions and characteristics
2005BS EN 13707:2004 Flexible sheets for waterproofing-Reinforced bitumen sheets for roof waterproofing-Definitions and characteristics
2000BS 747:2000 Reinforced bitumen sheets for roofing - Specification