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Glossary of Roofing Terms: O
Objectivism: The philosophy of Ayn Rand. The concept of man as a heroic being, with his own happiness as the moral purpose of his life, with productive achievement as his noblest activity, and reason as his only absolute.
Off-Ratio Foam: SPF where the 1 to 1 ratio of the A and B components has been compromised and which results in a lower quality material.
Open Time: The time after an adhesive has been applied and permitted to cure when the two surfaces can be bonded.
Open Valley : A valley where both sides of the roof are trimmed back from the centerline to expose the valley flashing material beneath.
Orange Peel Surface Texture: A surface with a texture comparable to the skin of an orange upon which a protective coating may be applied.
Organic: Formed from hydrocarbons.
Organic Felt: An asphalt roofing base material manufactured from cellulose fibers.
Organic Shingle: An asphalt shingle reinforced with organic material manufactured from cellulose fibers.
ORNL: Oak Ridge National Laboratory
OSB: Oriented Strand Board - Often used as roof sheathing in place of plywood.
Overlay: The installation of a new roof system over an existing system without removing an existing system.
Overspray: The loss of spray particles (from coatings, SPF, etc.) in the air.
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