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		A built-up roofing consists of plies or layers of roofing felt bonded together on site with hot bitumen. It is laid down to conform to the roof deck and to seal all angles formed by projecting surfaces so that it constitutes a single-unit flexible waterproof membrane. The simple principle for flat roofs is to turn the membrane up to make a skirting or base flashing on vertical surfaces in order to form a large water-tight tray. The only outlets from this tray are the roof drains or scuppers to dispose of water.
							Construction of satisfactory built-up roofing is only possible if high standards are maintained in all phases of design and construction. Design requires a thorough consideration of the physical environment, the relationship of the roofing system to the structure, the component materials and their inter-relationship, as well as proper consideration of all design details.