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Architectural Shingles:

See laminated shingles.

Built-up Roofing:

A roof consisting of multiple layers of asphalt and ply sheets.


A peak saddle construction at the back of the chimney to prevent accumulation of snow or ice and used to deflect water around the chimney.


Pre-formed flange placed over a vent pipe to seal the roof around the vent pipe opening; also called a vent sleeve.


The surface, usually plywood or oriented strand board (OSB), to which roofing materials are applied.


A small structure projecting from a sloped roof, usually with a window.


Drip edge:

An L-shaped strip (usually metal) installed along roof edges to allow water run off to drip clear of the deck, eaves and siding.


The horizontal lower edge of a sloped roof



A Flat board that is nailed to the ends of a roof rafter; sometimes supports a gutter. In low-slope roofing, the vertical or steeply sloped roof or trim located at the perimeter of a building.


A sheet of asphalt-saturated material (often called tar paper) used as a secondary layer of protection for the roof deck.

Fire rating:

System for classifying the fire resistances of various materials. Roofing materials are rated Class A, B or C, with Class A materials having the highest resistance to fire originating outside the structure.


Pieces of metal used to prevent the seepage of water around any intersection or projection in a roof system, such as vent pipes, chimneys, valleys and joints at vertical walls.



The upper portion of a sidewall that comes to a triangle at the ridge of a sloping roof.

Gable Roof:

A type of roof containing sloping planes of the same pitch on each side of the ridge. This roof contains a gable at each end.

Gambrel Roof:

A type of roof containing two sloping planes of different pitch on each side of the ridge. The lower plane has a steeper slope than the upper. This roof contains a gable at each end.


Ceramic coated colored crushed rock that is applied to the exposed surface of asphalt roofing products.

Hip Roof:

A type of roof containing sloping planes of the same pitch on each of four sides. This roof contains no gables.

Laminated Shingles:

Strip shingles containing more than one layer of tabs to create extra thickness; also called three-dimensional shingles or architectural shingles.

Oriented strand board (OSB):

Roof deck panels (4 by 8 feet) made of narrow bits of wood, installed lengthwise and crosswise in layers, and held together with resin glue. OSB often is used as a substitute for plywood sheets.


Vents, pipes, stacks, chimneys-anything that penetrates a roof deck.


The degree of roof inclined expressed as the ratio of the rise, in feet, to the span, in feet.


The supporting framing to which a roof deck is attached.



The inclined edge of a roof over a wall.


The top edge of two intersecting sloping roof surfaces.

Self-sealing Strip

– Factory applied adhesive that bonds shingle courses together when exposed to the heat of the sun after application.


The boards or sheet materials that are fastened to rafters to cover a house or building.


Measured by rise in inches for each 12 inches of horizontal run: A roof with a 4-in-12 slope rises 4 inches for every foot of horizontal distance.



Area under overhang.


The common measurement for roof area. One square is 100 square feet (10 by 10 feet).


Engineered components that supplement rafters in many newer homes and buildings. Trusses are designed for specific applications and cannot be cut or altered.


– Asphalt saturated felt used beneath roofing to provide additional protection for the deck. Synthetics are widely available as well. Ranging from plastics to rubber/asphalt based.


The angle formed at the intersection of two sloping roof surfaces.


Vapor retarder:

A material designed to restrict the passage of water vapor through a roof system or wall.

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