Glossary of Roofing Terms
Roofing nails and staples driven into decks at angles not parallel to the deck.
Metal flashing used at chimney fronts.
A bituminous waterproofing agent used in various types of roofing materials.
The American Society for Testing and Materials. Organization that sets standards for a wide variety of materials, including roofing.
Granular material added to shingle’s back to assist in keeping separate during delivery and storage.
Bubbles or pimples in roofing materials. Usually moisture related. In shingles blisters are caused by either moisture under the material or moisture trapped inside the material.
When shingles are subjected to high winds, and are forced off a roof deck.
When a wrinkle or ripple affects shingles or their underlayments.
Closed Cut Valley
A shingle valley installation method where one roof plane’s shingles completely cover the other’s. The top layer is cut to match the valley lines.
The metal or siding material that is installed over roof-top base flashing systems.
A peaked water diverter installed behind chimneys and other large roof projections. Effectively diverts water around projections.
When shingles are improperly installed over an existing roof or are over-exposed, they may form a curl or cup. May also be due to a manufacturing defect.
The substrate over which roofing is applied. Usually plywood, wood boards, or planks.
A raised roof extending out of a larger roof plane.
An installed lip that keeps shingles up off the deck at edges, and extends shingles out over eaves and gutters, and prevents
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.
When installing rolled products in roofing, the area where a roll ends on a roof, and is overlapped by the next section of rolled material.
The area on any roofing material that is left exposed to the elements.
Nails or staples used to secure roofing to the deck.
Fibers condensed into strong, resilient mats for use in roofing materials.
Metal pan extending up or down a roof slope around flashing pieces. Usually at chimneys and plumbing vents
Materials used to waterproof a roof around any projections
Sealant designed for use around flashing areas, typically thicker than plastic cement. Also, Silicon based Caulking
Traditional roof style; two peaked roof planes meeting at a ridge line of equal size.
Crushed rock that is coated with a ceramic coating and fired, used as top surface on shingles.
The method to assure sealing of shingles on very steep slopes, in high wind areas, and when installing in cold weather.
When shingles are nailed or fastened above the manufacturer’s specified nail location.
The down-slope ridges on hip roofs.
A roof with four roof planes coming together at a peak and four separate hip legs.
When a snow load melts on a roof and re-freezes at the eave areas. Ice dams force water to “back-up” under shingles and cause leakage.
Continuous metal flashing consisting of several feet of metal. Used at horizontal walls, bent to resemble an “L”.
Shingles made from two separate pieces that are laminated together. Such as GAFMC Timberline®Series, Country Mansion® and Grand Sequoia® Shingles. Also called dimensional shingles and architectural shingles.
The area where roll roofing or rolled underlayments overlap one another during application (see also side laps and end laps).
Roof pitches less than 4/12 are considered low sloped roofs. Special installation practices must be used on roofs sloped 2/12-4/12. Shingles can not be installed at slopes less than 2/12.
A roof design with a nearly vertical roof plane that ties into a roof plane of less slope at its peak.
The general term for the base material of shingles and certain rolled products.
Rolled roofing membrane with polymer modified asphalt and either polyester or fiberglass reinforcement.
Nail Guide Line
Painted line on laminated shingles, to aid in the proper placement of fasteners.
When a nail is not fully driven, it sits up off the roof deck.
Valley installation using metal down the valley center.
Material made from recycled wood pulp and paper.
Shingles made from organic (paper) mats.
Oriented Strand Board. A decking made from wood chips and lamination glues.
The term used for fasteners driven through roofing material with too much force, breaking the material.
Installing shingle courses higher than their intended exposure.
Term for the size of hand sealant dabs, size of a 25¢ piece.
Method of installing shingles in a straight up the roof manner.
The vertical edge of gable style roof planes.
Hard plastic ridge vent material.
Rooftop rectangular shaped roof vents. Also called box vents, mushroom vents, airhawks, soldier vents, roof louvers.
Sealant installed on shingles. After installation, heat and sun will activate sealant to seal the shingles to each other.
The non exposed area on rolled roofing. Area without granules. Designed for nail placement and sealant.
The area on rolled material where one roll overlaps the rolled material beneath it. Also called selvage edge on rolled roofing.
Where a vertical roof plane meets a vertical wall. The sides of dormers etc.
Intake ventilation installed under the eaves, or at the roof edge.
Steep Slope Roofing
Generally all slopes higher than 4/12 are considered steep slopes.