That portion of the flashing attached to or resting on the deck to direct the flow of water onto the roof covering.

1"x2"x4' wood strips nailed to the roof, upon which the field tile hangs.

In addition to preventing birds from nesting in the hollows of the tile, this length of formed metal or foam elevates the first course of tile so that it is positioned at the same angle as subsequent courses.

Bubbles that may appear on the surface of asphalt roofing after installation.

An outer covering of a comparatively flat roof, consisting of several layers of saturated felt. As laid, each layer is mopped with hot tar or asphalt. The top layer is finished with a mineral or rock covering and a special coating.

A package of shingles. There are 3, 4 or 5 bundles per square.

The lower edge of the shingle tabs.

To fill a joint with mastic or asphalt cement to prevent leaks.

A line made on the roof by snapping a taut string or cord dusted with chalk. Used for alignment purposes.

The highest fire-resistance rating for roofing as per ASTM E-108. Indicates roofing is able to withstand severe exposure to fire originating from sources outside the building.

Fire-resistance rating that indicates roofing materials are able to withstand moderate exposure to fire originating from sources outside the building.

Fire-resistance rating that indicates roofing materials are able to withstand light exposure to fire originating from sources outside the building.

A method of valley treatment in which shingles from one side of the valley extend across the valley while shingles from the other side are trimmed two inches from the valley centerline. The valley flashing is not exposed.

A layer of viscous asphalt applied to the base material into which granules or other surfacing is embedded.

Pre-formed flange placed over a vent pipe to seal the roof around the vent pipe opening. The collar is also called a vent sleeve.