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Open Valley

Method of valley installation in which shingles on both sides of the valley are trimmed along a chalk line snapped on each side of the valley. Typically a premium installation method in which shingles do not extend across the valley. Valley flashing is...

Organic Felt

An asphalt roofing material made from cellulose fibers.

Overdriven

The term used for fasteners driven through roofing material with too much force, damaging the material. Usually when pnumatic nailers are turned up to too high of a pressure.

Overexposed

Installing shingle courses higher than their intended exposure allowing fasteners to be exposed and vulnerable to...

Overhang

That portion of the roof structure that extends beyond the exterior walls of a building.