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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.
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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.
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