Dictionary of Construction Terminology

Dictionary of Construction Terminology

Search for glossary terms (regular expression allowed)
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Term Definition
O C- On Center
The measurement of spacing for studs, rafters, and joists in a building from the center of one member to the center of the next.
Oakum
Loose hemp or jute fiber that's impregnated with tar or pitch and used to caulk large seams or for packing plumbing pipe joints
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.
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.
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.
Outside corner
The point at which two walls form an external angle, one you usually can walk around.
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.