Roofing Terminology
(Click on a letter to learn more)
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Damp Proofing
Treatment of a surface or structure to resist the passage of water in the absence of hydrostatic pressure.
Dead Level
The term used to describe an absolutely horizontal roof. Zero slope.
Dead Level Asphalt
A roofing asphalt that has a softening point of 140F (60C) and that conforms to the requirements of ASTM Standard D 312, Type 1.
Dead Loads
Non-moving rooftop loads, such as mechanical equipment, air conditioning units, and the roof deck itself.
Deck
The structural surface to which the roofing or waterproofing system (including insulation) is applied.
Degradation
A deleterious change in the chemical structure, physical properties, or appearance of a material due to natural or artificial exposure.
Delamination
Separation of the plies in a roof membrane system or separation of laminated layers of insulation.
Dewpoint
The temperature at which water vapor starts to condense in cooling air at the existing atmospheric pressure and vapor content.
Drain
A device that allows for the flow of water from a roof area.
Dropback
A reduction in the softening point of bitumen that occurs when bitumen is heated in the absence of air.
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