Roofing Terminology
(Click on a letter to learn more)
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Heat Welding
Method of melting or fusing together the overlapping edges of separate sheets of thermoplastics and polymer modified bitumens.
Headlap
The minimum distance, measured at 90 degrees to the eaves along the face of a shingle or felt, form the upper edge of the shingle or felt to the nearest exposed surface.
Holiday
An area where a liquid applied material is missing.
Hot Stuff
Roofer's term for hot bitumen.
Hydroscopic
The term used to describe a material which attracts, absorbs and retains atmospheric moisture.
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