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Roofing Glossary

Here are some words and phrases you might hear during your roof replacement process.

Allow us to explain them for you!

Algae Discoloration

A type of roof discoloration caused by algae. Commonly described incorrectly as fungus growth.

Blisters

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

Decking

The surface, installed over the supporting framing members, to which the roofing material is applied.

Drip Edge

A corrosion-resistant, non-staining material used along the eaves and rakes to allow water run-off to drip clear of underlying construction.

Eave

The horizontal, lower edge of a sloped roof.

Felt

Fibrous material saturated with asphalt and used as an underlayment or sheathing paper.

Flashing

Pieces of metal 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. 

Gable

The upper triangular portion of a sidewall that comes to a point at the ridge of a double sloping roof. 

Hip

The inclined external angle formed by the intersection of two sloping roof planes. Runs from the ridge to the eaves.

Rake

The inclined edge of a sloped roof over a wall.

Ridge

The uppermost, horizontal external angle formed by the intersection of two sloping roof planes.

Run

The horizontal distance from the eaves to a point directly under the ridge. 

Slope

The degree of roof incline expressed as the ratio of the rise, in inches, to the run, in inches. For example, a roof slope of 4/12 has a 4 inch rise every 12 inches.

Square

A unit of roof measure covering 100 square feet

Step Flashing

Base flashing application method used where a vertical surface meets a sloping roof plane.

Tab

The exposed portion of strip shingles defined by cutouts.

Underlayment

Asphalt saturated felt or specially engineered synthetic material used beneath roofing to provide additional protection for the decking.

Valley

The internal angle formed by the intersection of two sloping roof planes.

Vent

Any outlet for air that protrudes through the roof deck such as a pipe or stack. Any device installed on the roof, gable or soffit for the purpose of ventilating the underside of the roof deck.