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Summary: Building dictionary to explain building jargon and terminology from A - Z.
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Building dictionary for the letter O - Page 1
Oak
A hard, dense wood used in flooring, finish carpentry and furniture.
Obligation
A result of custom, law, or agreement by which an individual is duty bound to fulfill an act or other responsibility.
Oblique drawings
One face of an object is drawn directly on the picture plane. Projected lines are drawn at a 30 degree or 45 degree angle.
Oblique section
An architectural or mechanical drawing of a section through an object, at an angle other than 90� to its long axis.
Obscure glass
Glass that transmits light but does not allow a view of objects on the other side, such as ground glass or frosted glass; translucent glass.
Obscure window
A window glazed with obscure glass, installed for privacy.
Occupancy
The designed or intended use of a building. Also, the ratio of present space being used or rented to the designed full use, expressed as a percent.
Occupancy permit
See certificate of occupancy.
Occupancy rate
The number of persons per building, unit, room, or floor.
Occupancy sensor
A heat-sensitive electronic sensor that reacts to moving heat sources within its monitored field. Used as a component of security and lighting systems.
Occupant load
The maximum number of persons in an area at a given peak period.
Occupational Health and Safety Act
The federal law governing the safety of workers in the workplace.
Occurrence
In insurance terminology, a happening or event. Usually refers to an injury or damage that is neither expected nor intended.
Odorless paint
A water-base paint, or a base using odorless mineral spirit, which produces very little odor.
Off-centre
A load that is applied off the geometric centre of a structural member, or a structural member that is placed off the geometric centre of an applied load.
Offer
A proposal, as in a wage and benefits package, to be accepted, negotiated, or rejected.
Offset
(1) In surveying, a line or point placed at a given distance from a control line or point used to reestablish the original location. (2) In plumbing, an assembly of fittings on a pipeline that takes one section of pipe out of line but parallel to a second section. (3) Any bend in a pipe.
Offset screwdriver
A screwdriver whose head is set at 90� to its shaft.
Offset bend
An intentional distortion from the normal straightness of a steel reinforcing bar in order to move the centre line of a segment of the bar to a position parallel to the original position of the centre line. The offset bend is commonly applied to vertical bars that are used to reinforce concrete columns.
Offset stakes
Stakes placed by the excavator to mark the corners of a building after the surveyor's stakes have been removed.
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