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O

O.C. – “On Center”. A measurement term meaning a certain distance between like materials. Studs rafters, joists, and the like in a building placed at 16 inches O.C. will be laid out so that there is 16 inches from the center of one stud to the center of the next.
O.G. (or ogee) – A molding with a profile in the form of a letter S; having the outline of a reversed curve. – A molding with a profile in the form of a letter S; having the outline of a reversed curve.
Ohmmeter – In electrical contracting, a device to measure the resistance across a load. They are never used on a live circuit. It is used to track down broken wires.
Ohm’s Law – States that, in a given electrical circuit, the amount at current in amps is equal to the pressure in volts divided by the resistance in ohms. The formula is: I (Current) = V voltage or V = I x R R resistance or R = V/I
Oil-Canning – The term describing distortion of thin-gauge metal panels which are fastened in a manner restricting normal thermal movement.
Organic – A term designating any chemical compound which contains carbon and hydrogen.
Outrigger – An extension of a rafter beyond the wall line. Usually a smaller member nailed to a larger rafter to form a cornice or roof overhang.
Overhang – That part of the roof structure which extends horizontally beyond the vertical plane of the exterior walls of a building.
Oxidize – To combine with oxygen in the air.