Architectural and Engineering Glossary

C

Combined Aggregate

A mixture of fine and coarse aggregate for a concrete.

Combined Aggregate Grading

The particle size distribution of a mixture of fine and coarse aggregates.

Combined Building Drain

A building drain that conveys the drainage of both sewage and storm water.

Combined Frame

A doorframe having fixed panes of glass flanking one or both sides of the door.

Combined Load

Two or more different types of loads (such as dead load,live load,or wind load) on a structure,occurring simultaneously.

Combined Sewer

A sewer which carries both sanitary sewage and storm water.

Combined Stack

A soil pipe that carries both soil and waste discharges.

Combined Stresses

A stress state which cannot be represented by a single component of stress.

Combplate

The toothed portion of the stationary threshold plate at both ends of an escalator or moving walk,designed to mesh with the grooved surface of the moving steps or treadway.

Combustibility

The ease with which a material will burn when subject to heat.

Combustible

Capable of undergoing combustion in air,at pressures and temperatures that might occur during a fire in a building.

Combustion Liquid

A liquid having a flash point at or above 140F (60C) and below 200F (93.4C).

Come Along

A tool for spreading concrete,similar to a hoe;has a blade approx.20 in.(50 cm) wide and 4 in.(10 cm) high.

Comedor

A dining room in a Spanish Colonial house.

Comfort Chart

A chart which relates effective temperature,dry bulb temperature,wet bulb temperature,and air movement to human comfort;comfort zones are indicated on such a chart.

Comfort Station

A building or part thereof where toilet and lavatory facilities are available for public use.

Comfort Zone

In a heating,ventilating,and air-conditioning system,the range in temperature,humidity,and air movement that most of the building’s occupants consider to be comfortable.

Commaunder

Same as a blockhouse.

Commercial Bronze

An alloy containing 90% copper,10% zinc;so called because of its bronze color;esp.used in weatherstripping.

Commercial Tolerances

The plus and/or minus allowances that are acceptable with a specified dimension.

Common

A large plot of grassy,fenced-in,publicly owned land,generally at or near the center of a village or town;in earlier eras,once shared by the townspeople as a pasture.

Common Alloy

An alloy that does not increase in strength when heat treated but may be strengthened by strain hardening.

Common Area

An area either within a building or outside a building which is intended for use of all occupants of the building or a group of buildings,but not for the free use of the general public.

Common Ashlar

A pick or hammer dressed block of stone.

Common Brass,high Brass

An alloy containing 65% copper,35% zinc;the most common of commercial wrought brasses.

Common Excavation

The excavation of material that does not require blasting,such as earth,in contrast to the excavation of solid rock.

Common Lap

Shingle roofing in which alternate courses are offset one half the width of a shingle.

Common Lime

Either hydrated lime or quick lime;used in plastering.

Common Return

An electrical conductor which serves as the electrical return for more than one circuit.

Common Roof

A roof supported only by common rafters,without purlins.

Common Room

1.A room or lounge for the informal use of all members of a college.2.A room or lounge for the use of the patrons of an inn.

Common Vent

See dual vent.

Common Wall

See party wall.

Communion Table

In Protestant churches,a table used instead of an altar in the Communion service.

Community

A group of people having common rights,privileges,or interests,or living in the same place under the same laws and regulations. 

Community Center

A building or group of public buildings for the social,cultural,and educational activities of a neighborhood or entire community.
 

Compacted Yards

The compacted volume measured in cubic yards.
 

Compartment

A small space within a larger enclosed area,often separated by partitions.
 

Compartment Ceiling

A ceiling divided into panels,which are usually surrounded by moldings.

Compass Brick

An arch brick.

Compass Headed Arch

A semicircular arch.

Compass Plane

A plane having a curved base plate (either concave or convex);for smoothing curved woodwork.

Compass Saw

A handsaw having a narrow blade;used to cut small intricate shapes or circles of small radius.

Compass Survey

A traverse survey which relies on the magnetic needle for orienting the sequence as a whole or for determining the bearings of the lines individually.

Compass Timber

Timber that has been cut from a branch having a smooth curve of the required shape.

Complete Fertilizer

In landscape architecture,a fertilizer that contains all the nutrients that plants use in quantity,such as nitrogen,phosphorus,and potassium.

Complete Fusion

In welding,fusion that has occurred over the entire basemetal surfaces exposed for welding and between all layers and passes.

Completion List

See inspection list.

Compliance

See certificate of compliance.

Compo

1.Any composition material.2.Mortar made with an appropriate proportion of cement,lime,and sand.3.Various plastic cements and pastes which harden on exposure,as papiermâché.