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This glossary was designed to help those not directly involved in roofing with their understanding of roofing terminology. Many technical and chemical terms were not included.

Objectivism¹: 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.<picture>

Overlay: See Re-Cover.

Overspray: The loss of spray particles (from coatings, SPF, etc.) in the air.

¹ THE AYN RAND LEXICON, Objectivism From A To Z, edited by Harry Binswanger, page 343, ©1986, Published by Meridian, an imprint of New American Library, a division of Penguin Books USA Inc.


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