The definitions are arranged in alphabetical order:

A | B | C | D | E | F | G | H | I | L | M | N | O | P | Q | R | S | T | U | V | W

Eaves:: The horizontal, lower edge of a sloped roof.
Eaves flashing:: Additional layer of roofing material applied at the eaves to help prevent damage from water back-up.
Edging strips:: Boards nailed along eaves and rakes after cutting back existing wood shingles to provide secure edges for reroofing with asphalt shingles.
Ell:: An extension of a building at right angles to its length.
Exposed nail method:: Application of roll roofing in which all nails are driven into the cemented, overlapping course of roofing. Nails are exposed to the weather.
Exposure I grade plywood:: Type of plywood approved by the American Plywood Association for exterior use.

Feathering strips:: Tapered wood filler strips placed along the butts of old wood shingles to create a level surface when reroofing over existing wood shingle roofs. Also called horsefeathers.
Felt:: Fibrous material saturated with asphalt and used as an underlayment or sheathing paper.
Fiber glass mat:: An asphalt roofing base material manufactured from glass fibers.
Flashing:: Pieces of metal or roll roofing used to prevent seepage of water into a building around any intersection or projection in a roof such as vent pipes, chimneys, adjoining walls, dormers and valleys. Galvanized metal flashing should be minimum 26-gauge.
Flashing Cement:: See asphalt plastic roofing cement.
FM:: Factory Mutual Research Corp.
Free-tab shingles:: Shingles that do not contain factory-applied strips or spots of self-sealing adhesive.

Gable:: The upper portion of a sidewall that comes to a triangular point 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. 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. Contains a gable at each end.
Granules:: Ceramic-coated colored crushed rock that is applied to the exposed surface of asphalt roofing products.
Gutter:: The trough that channels water from the eaves to the downspouts.

Head lap:: Shortest distance from the butt edge of an overlapping shingle to the upper edge of a shingle in the second course below. The triple coverage portion of the top lap of strip shingles.
HEX shingles:: Shingles that have the appearance of a hexagon after installation.
Hip:: The inclined external angle formed by the intersection of two sloping roof planes. Runs from the ridge to the eaves.
Hip roof:: A type of roof containing sloping planes of the same pitch on each of four sides. Contains no gables.
Hip shingles:: Shingles used to cover the inclined external angle formed by the intersection of two sloping roof planes.
Horsefeathers:: See feathering strips.

Ice dam:: Condition formed at the lower roof edge by the thawing and re-freezing of melted snow on the overhang. Can force water up and under shingles, causing leaks.
Interlocking shingles:: Individual shingles that mechanically fasten to each other to provide wind resistance.