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Roofing Glossary: O

Roofing terms that begin with ‘O’

Our roofing glossary defines common roofing terms. Please let us know if we are missing any words!

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Open Valley
Valley installation using metal down the valley center.

Organic Mat
Material made from recycled wood pulp and paper.

Organic Shingles
Shingles made from organic (paper) mats.

OSB
Oriented Strand Board. A decking made from wood chips and lamination glues.

Overdriven
The term used for fasteners driven through roofing material with too much force, breaking the material.

Overexposed
Installing shingle courses higher than their intended exposure.

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