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Glossary

Terms


Asphalt  – A black or dark brown material that varies in consistency – from a glassy solid to viscous liquid. It’s a petroleum product that can be used in either its natural or refined state. Asphalt is usually refined to meet different roofing requirements. Speak with us to inquire which grades of asphalt your task will require.

Asphalt Roof Cement  – An asphalt-based cement commonly used to repair loose shingles and seal leaks. It’s also known as flashing cement.

Base Sheet – The bottom waterproofing layer in a roof’s membrane system.

Base Flashing – A section of the flashing attached to or resting on the deck to direct the flow of water onto the roof covering.

Bridging – A method of reroofing that allows for proper exposure of the shingles.

Built-up Roof – A roof system built by alternating layers of ply sheets and other roofing materials, e.g. coal tar pitch, asphalt, or cold application adhesive.

Cap Flashing – A layer of flashing applied to a vertical surface that prevents water from getting to the base flashing.

Counter Flashing– See definition for cap flashing

Drip Edge – Corrosion resistant metal flashing used along the roof’s edges to prevent water runoff dripping onto the building.

Downspout – A vertical tube that drains water from a roof’s gutters. 

Eave – The horizontal, lower edge of a sloped roof. It runs from the fascia to the structure’s outside wall.

Exposure – The amount of a shingle’s upper surface that isn’t overlapped by the next successive shingle.

Flashing – Waterproof material placed around projections, e.g. chimneys and skylights, to prevent leaks.

Gable – The triangular portion of a sidewall. It lies in between the edges of a roof’s intersecting slopes.

Gable Roof – A roof with two sections that slope in opposite directions and meet at a triangular roof ridge.

Granules – Crushed rock applied on exposed roofing surfaces. They protect shingles and other roofing products from direct sunlight.

Gutter – A trough in a water discharge system that channels rainwater from a roof’s eaves to its downspouts.

Hip –  An angle formed by the intersection of two sloping roofing planes. The planes run from the ridge plane – where they meet – down to the roof’s eaves.

Hip Roof –  A roof where all walls from a horizontal join called the ridge plane. This roof, as its name suggests, has no gables.

Lap – To cover the surface of a shingle or roll with another.

Membrane – Flexible waterproofing that prevents internal leaks in the roof.

Nesting – A method of reroofing where the top edge of the new shingle is butted against the bottom edge of the old one. It is primarily done to avoid shingle cupping – a telltale sign of wear and tear.

Ply – A layer of roofing.

Protected membrane roof (PMR) -| A roofing assembly setup where extruded polystyrene foam (XEPS) is installed loosely over the actual roof membrane.

Telegraphing – Distortion caused by the shingles being laid on an uneven surface.

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