Deck: The substrate over which roofing is applied, usually plywood, wood boards, or planks. The surface is supported by the framing members.

	Eaves: The roof edge from the fascia to the structure’s outside wall. In general terms, the first three feet across a roof is termed the eave.

	Starter Strip: Asphalt roofing applied at the eaves that provides protection by filling in the spaces under the cutouts and joints of the first course of shingles. This is the first course of roofing installed. Usually trimmed from main roof material.

	Valley: Area where two adjoining sloped roof planes intersect on a roof creating a "V" shaped depression.

	Drip Edge: An installed lip that keeps shingles up off of the deck at edges, and extends shingles out over eaves and gutters, and prevents water from backing up under shingles.

	Drip Edge: An installed lip that keeps shingles up off of the deck at edges, and extends shingles out over eaves and gutters, and prevents water from backing up under shingles.

	Flashing: Pieces of metal or roll roofing used to prevent seepage of water into a building around any intersection or projection in a roof such as vent pipes, chimneys, adjoining walls, dormers and valleys. Galvanized metal flashing should be minimum 26-gauge.

	Shingles: A roof covering consisting of individual overlapping elements. These elements are normally flat rectangular shapes that are laid in rows without the side edges overlapping, a double layer is used to ensure a waterproof result. Shingles are laid from the bottom edge of the roof up, with the bottom edge of each row overlapping the previous row by about half its length.

	Ridge: The highest point on the roof, represented by a horizontal line where two roof areas intersect, running the length of the area.

	Underlayments: Asphalt based rolled materials designed to be installed under the main roofing material to separate the roof covering from the roof deck, to shed water, and to provide secondary weather protection for the roof area of the building.