ABC Roofing Terms Glossary

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Term	Definition
Dormer	A framed window unit that projects through the sloping plane of a roof.
Double coverage	Application of asphalt roofing such that the lapped portion is at least two inches wider than the exposed portion, resulting in two layers of roofing material over the deck.
Downspout	A pipe for draining water from roof gutters. A downspout is also called a leader.
Drip edge	A non-corrosive, non-staining material used along the eaves and rakes to allow water run-off to drip clear of underlying construction.
Dutch lap method	a shingle that is textured, overlayed, or laminated and designed to produce a three-dimensional effect. Similar to Laminated shingle and Architectural shingle.
Eaves	The horizontal, lower edge of a sloped roof.
Eaves flashing	Additional layer of roofing material applied at the eaves to help prevent damage from water back-up.
Edge venting	The installation of a vent material along the roof edge (e.g., Starter Vent) as part of a ventilation system. Edge vent material should be used in conjunction with other venting material (e.g., ridge vent) as it not intended for use by itself.
Edging strips	Boards nailed along eaves and rakes after cutting back existing wood shingles to provide secure edges for re-roofing with asphalt shingles.
Exposed nail method	Application of roll roofing in which all nails are driven into the cemented, overlapping course of roofing. Nails are exposed to the weather.