Lon Smith Roofing Terms Glossary

This glossary was designed to help those not directly involved in roofing with their understanding of roofing terminology. Many technical and chemical terms were not included.

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Term	Definition
Interlocking shingles	Individual shingles that mechanically fasten to each other to provide wind resistance.
Joists	Any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling.
Laminated shingles	Strip shingles containing more than one layer of tabs to create extra thickness. Laminated shingles are also called three-dimensional shingles.
Lap	To cover the surface of one shingle or roll with another.
Lap cement	An asphalt-based cement used to adhere overlapping plies of roll roofing.
Lean-to roof	A roof with one slope only that is built against a higher wall.
Life-cycle cost	The total lifetime cost of a roof. Calculated by adding maintenance costs to the installed price, then deducting the added value the roof provides when the home is resold.
Low slope application	Method of installing asphalt shingles on roof slopes between two and four inches per foot.
Mansard roof	A type of roof containing two sloping planes of different pitch on each of four sides. The lower plane has a much steeper pitch than the upper, often approaching vertical. Contains no gables.
Mastic	An asphalt-based cement used to bond roofing materials. Also known as flashing cement.