Glossary of Roofing Terms 2

Gable:

A type of roof with two slopes meeting at a horizontal ridge. Also, the triangular area formed by such a roof.

Hip"

A downward sloping intersection of two roof planes that extends from the ridge to the outside corner of the house. Also, a type of roof.

Rake:

The edge of a pitched roof at the gable end.

Ridge:

The top edge of the roof, where two roof slopes meet in a horizontal line.

Sheathing:

Boards or plywood sheets that form the nailing base for roofing shingles or tiles.

Slope (or pitch):

The number of inches of verticle rise of the roof over a horizontal distance of 12 inches; a “4 in 12” roof has a slope that rises 4 inches over a 12-inch run.

Soffit:

The underside of the rafters and roof at the eaves.

Square:

Unit of measure equaling 100 square feet, used as a basis for measuring roof area. Also, the amount of roofing material, allowing for overlapping, needed to cover 100 square feet of roof.

Underlayment:

The material, usually asphalt-saturated roofing felt, used to cover deck sheathing before the roof surface is put down.

Valley:

The junction where two downward sloping roofs meet at an angle, an important channel for water runoff.

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