O

The time between the application of glue to joints (or wood veneer) and the assembly.

This type of bidding is frequently used to conform to legal requirements pertaining to public projects.

Roofing boards which are laid with a gap between adjacent boards.

A building system which is designed so that its subsystems are interchangeable with like subsystems,its subassemblies are interchangeable with like subassemblies,and its components or building elements are interchangeable with like building components or elements of other systems.

In foam rubber,cellular plastics,etc.,a cell which interconnects with other cells.

A chapel,one side of which faces the open air.

A discontinuous electric circuit through which no current can flow.
 

The process of selecting a contractor in which an advertisement for bids is published in the news media to notify qualified contractors of the owner’s intention to receive sealed competitive bids.

Said of a building component,building assembly,or building which is manufactured in such a way that all portions can be readily inspected at the installation site with out disassembly or destruction.

Overhanging eaves where the rafters are exposed at the eaves and can be seen from below.

A wood crenelated molding of perforated,open design;often used in Gothic Revival buildings in Colonial America.

An excavation,open to the sky,which has been cut from the ground surface downward,in contrast to tunnel excavation.

An unfilled hole or gap in lumber,plywood,or wood veneer.

See open cornice.

Space without roof and/or side closure,capable of serving for egress to a street or other public space.

A floor whose joists are visible from the floor below.

A common Norman molding consisting of a series of overlapping shapes resembling the outlines of a heart.
 

In a pump,an impeller that  does not have shrouds (i.e.,disks  that  enclose the impeller vanes);usually used where the  water being pumped contains suspended solids.

A structural platform used for required access to industrial operations conducted in the open air,such as oil refining and chemical processing;often, a roof or canopy is provided for shelter,but there are no walls.

A structure,normally open to the outdoors on two or more sides,for the temporary storage of motor vehicles.

Plumbing which is exposed;the traps and drainage pipes,beneath the fixtures,are accessible,ventilated,and open to inspection. 

The space between two adjacent treads in a stair when such space is not filled by a solid riser.
 

A vertical duct or small enclosed passage within a building,open to the outer air at the top,and used to ventilate interior spaces connected to it.Also see light well.

See open sheeting.

Horizontal or vertical planks or boards placed at intervals along the face of an excavation;used where the soil is sufficiently firm to  make close sheeting unnecessary and where groundwater is not a problem.

Shelving which is exposed,not concealed by a door or cabinet.

A construction project operating under a work system that does not require membership in a particular union as a condition of employment.Compare with closed shop.

In roofing,a slating pattern in which spaces are left between adjacent slates in a course.

A solar energy system whose storage tank is open to atmospheric pressure.

In urban planning,the designation given parks,recreational and natural areas,or other land not occupied by buildings.

The reciprocal of coverage3.

A fire sprinkler (i.e.,sprinklerhead) with a normally open nozzle.
 

In a theater,a stage platform not bounded by a proscenium arch.

A stair whose treads are visible on one or both sides.

A stairway,one or both sides of which are open to a room in which it is located.

An inclined board in a vertical plane,parallel to the slope of a stair (i.e., a string),whose upper edge is cut to fit the profile of the treads and risers of the steps;the treads of the stairs project beyond the face of the string and are visible;compare with closed string.

See open stair.

A fluid piping system in which the circulating fluid is connected to an open vented elevated tank,to a cooling tower,or the like;the tank serves as a reservoir to accommo date the expansion and contraction of the fluid,and as a convenient location for inspecting the condition of the fluid.

See open bidding.

A cellular plastic in which there is a predominance of interconnected cells. 

A system for pumping grout in which there is no provision for recircuating the grout to the pump.

1.An A-block or an H-block concrete masonry unit.2.A standard block having recessed end webs.

A mortgage which permits the mortgager to borrow additional funds for improvements after the original loan has been made and permits him to repay them over an extended amortization period.

Same as open plan system.

Same as Vierendeel truss. 

An aggregate containing little or no mineral filler,or in which the void spaces in the compacted aggregate are relatively large.
 

Having a coarse texture.Also see coarse-textured,wide-ringed. 

An educational building,or portion thereof,having corridors that do not comply with code requirements for exterior exit corridors.

A large space,divided by free standing,partial-height partitions;usually designed to accommodate a large number of office workers.

Same as bid opening.