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Open-Web Joist

A prefabricated steel truss made of welded members, used for floor and roof construction.

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Oriented Strand Board

A panel made from wood strands that have their strand face oriented in the long direction of the panel.

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Outlet Box

A box that is part of the electrical wiring system that contains one or more receptacles.

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Optimization

The use of human health, environmental, and other product information by project teams to select preferable materials and products, and by manufacturers to improve materials and products https://healthymaterialslab.org/tool-guides/hml-resources

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Overhang

Outward projecting eave-soffit area of a roof; the part of the roof that hangs out or over the outside wall. See also Cornice.

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Oriented Strand Board or OSB

A manufactured 4' X 8' wood panel made out of 1"- 2" wood chips and glue. Often used as a substitute for plywood.

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Organic Material

A class of compounds comprising only those existing in plants and animals.

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Open hole inspection

When an engineer (or municipal inspector) inspects the open excavation and examines the earth to determine the type of foundation (caisson, footer, wall on ground, etc.) that should be installed in the hole.

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Outside corner

The point at which two walls form an external angle, one you usually can walk around.

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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.

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Overlaid Plywood

Plywood panels whose exterior surfaces are covered with a resin-impregnated fiber ply.

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Oxidize

To convert an element into oxide, such as rusting steel.

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P trap

Curved, "U" section of drain pipe that holds a water seal to prevent sewer gasses from entering the home through a fixtures water drain.

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Overload

The operation of electrical equipment in excess of the normal full-loaded electrical rating or of a conductor carrying current in excess of its rated capacity.