Rooftop fungus that can leave dark stains on roofing.

Apron Flashing
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.

Back Surfacing
Granular material added to shingles 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 a wrinkle or ripple affects shingles or their underlayment.

Closed 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.

Counter Flashing
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 sub straight over which roofing has been applied. Usually plywood, wood boards, or planks.

Drip Edge
A custom fabricated sheet metal lip that keeps shingles up off the deck at edges, and extends shingles out over eaves and gutters, and prevents water from getting behind the fascia board.

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.

Fiberglass Mat
Fibers condensed into strong, resilient mats for using in roofing materials.

Materials used to waterproof a roof around any projection.

Crushed rock that is coated with a ceramic coating and fired, used as top surface on shingles.

Ice Dam
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.

Laminate Shingles
Shingles made from two separate pieces that are laminated together. Also called dimensional shingles and architectural shingles.

Sealant installed on shingles. After installation, heat and sun will activate sealant to seal the shingles to each other.

Soffit Ventilation
Intake ventilation installed under the eaves, or at the roof edge.

Step Flashing
Metal flashing pieces installed at sidewalls and chimneys for weatherproofing.

When shingles reflect the uneven surface beneath them. This can occur on old board style roof decks as they tend to expand and contract a great deal more than plywood roof decks. To help prevent this from occurring, we recommend the installation of 3/8″ plywood overtop of old board style roof decks.

Asphalt based rolled materials designed to be installed under main roofing material to serve as added protection from wind driven rain.

Area where two adjoining sloped roof planes intersect on a roof creating a “V” shaped depression.

Waterproof Underlayment
Modified bitumen based roofing underlayment’s. Designed to seal to wood decks and waterproof critical leak areas.