Roof Covering: shingles, tile, slate or metal and underlayment that protect the sheathing from weather.
Sheathing: plywood or sheet material that are fastened to roof rafters to cover a house or building
Roof structure: rafters and trusses constructed to support the sheathing
Flashing: pieces of metal used to prevent water seepage around any intersection or projection in a roof system, such as vent pipes, chimneys, valleys and joints
Drainage: a roof system’s design features such as shape, slope and layout that affect its ability to shed water
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
Eave: the horizontal lower edge of a sloped roof
Fascia: a flat board, band or face located at a cornices outer edge.
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
Square: the common measurement for roof area. One square is 100 square feet (10 by10 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.