What is the European standard used for classification of construction products and building elements, including roofing?

What gravel break is included in Department for Education green roof specifications?

Fire breaks such as paving slabs or strips of pebbles should be installed across extensive green roofs to what requirement?

BS EN 13501-5 refers to four separate roof testing methods that are used to measure the fire safety of roofs. Which is the most thorough?

Which is the highest rating of roof classification under BS EN 13501-5?