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Deck/sheathing: The surface, usually plywood or oriented strand board (OSB),
to which roofing materials are applied.
Dormer: 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.
Eave: The horizontal lower edge of a sloped roof.
Fascia: A flat board, band or face located at a cornice's outer edge.
Felt/underlayment: 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.
Flashing:
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.
Louvers: Slatted devices installed in a gable or soffit (the
underside of eaves) to ventilate the space below a roof deck and equalize
air temperature and moisture.
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 a resin glue. OSB often is used as a substitute for plywood
sheets.
Penetrations: Vents, pipes, stacks, chimneys-anything that penetrates
a roof deck.
Rafters: The supporting framing to which a roof deck is attached.
Rake:
The inclined edge of a roof over a wall.
Ridge: The top edge of two intersecting sloping roof surfaces.
Sheathing: The boards or sheet materials that are fastened to rafters
to cover a house or building.
Slope: 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.
Square: The common measurement for roof area. One square is 100
square feet (10 by 10 feet).
Truss: Engineered components that supplement rafters in many newer
homes and buildings. Trusses are designed for specific applications and
cannot be cut or altered.
Valley: 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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