ABC Roofing Terms Glossary

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Term	Definition
Bundle	A package of shingles. There are 3, 4 or 5 bundles per square.
Butt edge	The lower edge of the shingle tabs.
Caulk	To fill a joint with mastic or asphalt cement to prevent leaks.
Chalk line	A line made on the roof by snapping a taut string or cord dusted with chalk. Used for alignment purposes.
Class "A"	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.
Class "B"	Fire-resistance rating that indicates roofing materials are able to withstand moderate exposure to fire originating from sources outside the building.
Class "C"	Fire-resistance rating that indicates roofing materials are able to withstand light exposure to fire originating from sources outside the building.
Closed cut valley	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.
Coating	A layer of viscous asphalt applied to the base material into which granules or other surfacing is embedded.
Collar	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.