Architectural and Engineering Glossary

C

Ceiling Height

The clear vertical distance from the surface of the finished floor to the ceiling above it.

Ceiling Outlet

1.A ceiling diffuser.2.A small metal box,mounted at ceiling level,in which electric conductors terminate;used to support a lighting fixture or other ceiling mounted electric appliance.

Ceiling Plenum

In an air-conditioning system,the space between a hung ceiling and the underside of a floor slab above,where this space is used as a plenum for return air.

Ceiling Ratio

In illumination engineering,the ratio of the luminous flux which reaches the ceiling directly to the upward component of the flux provided by a luminaire.

Ceiling Rose

See ceiling medallion.

Ceiling Strap

A strip of wood,nailed to the underside of floor joists or rafters,from which a ceiling is suspended or fastened.

Ceiling Strut

An adjustable vertical member which extends from the head of a doorframe to construction above;used to hold the frame in a fixed position prior to wall construction;also see strut guide.

Ceiling Suspension System

A system of metal members designed to support a suspended ceiling,typically an acoustical ceiling.Also may be designed to accommodate lighting fixtures or air diffusers.

Ceilure

See celure.

Celature

Engraved,chased,or embossed decoration on metal.

Cella,naos

The sanctuary of a classical temple,containing the cult statue of the god.

Cellar Hole

The excavation for a cellar or the open remains of a cellar.

Cellar Rot

Same as wet rot.

Cellar Sash

A window sash set into the foundation wall of a building,usually just below the horizontal member or surface that provides bearing and anchorage for the wall above.

Cellarino

In the Roman or Renaissance Tuscan or Doric orders of architecture,the neck or necking beneath the ovolo of the capital.

Cellarway

Passage to or through one or more cellars.

Cellula

1.In ancient Rome,a small sanctuary in the interior of a small temple.2.Any small chamber or storeroom.

Cellular Polystyrene

An insulation composed principally of a polymerized styrene resin which has been processed to form a rigid foam having a closed cell structure.
 

Cellular Block

A concrete masonry block which has uniformly distributed pores throughout its mass.

Cellular Brick

(Brit.) A brick or block in which holes,closed at one end, exceed 20% of the volume.

Cellular Cofferdam

A self sustaining cofferdam fabricated of interlocking steel sheet piling;has separate inside and outside walls.

Cellular Construction

Construction with concrete elements in which part of the interior concrete is replaced by voids.

Cellular Core Door

See mesh core door.

Cellular Glass

See foam glass.

Cellular Material

Any material that contains many cells (either open or closed,or both) dispersed throughout the mass.

Cellular Office

A large floor space that is divided into a number of individual offices by permanent walls,in contrast to an open plan office.

Cellular Plastic

A plastic containing numerous cells disposed uniformly throughout its mass. 

Cellular Raceway

A hollow space,in a modular floor system,suitable for use as a raceway for electric conductors.

Cellular Rot

Same as wet rot.

Cellular Rubber

A rubber product containing cells that are either open and interconnecting or closed and not interconnecting.

Cellular Striation

In a cellular material,such as plastic,a layer of cells that differ greatly from the characteristic cell structure of the material.

Celluloid

A relatively tough thermoplastic material made from plasticized cellulose nitrate with camphor;inflammable,easily molded,readily dyed,not light stable.

Cellulose Enamel

Lacquer made with nitrocellulose.Also see lacquer.

Cellulose Fiber Tile

An acoustical tile formed of cellulose fiber.

Cellulose Lacquer

A lacquer having a cellulose derivative base.

Cellulose Nitrate

A material formed by the reaction of cellulose fibers with nitric and sulfuric acids.Those with lower nitrogen content are used as binders in lacquers and are very inflammable.A high nitrogen content results in nitrocellulose,an explosive.

Celsius Scale

Same as centigrade scale.

Celtic Cross

A cross with a long vertical shaft and short horizontal arms,and with a circle struck from their intersection,joining all four.

CEM

On drawings,abbreviation for cement. 

CEM PLAS

On drawings,abbr.for cement plaster.

CEM MORT

On drawings,abbr.for cement mortar.

CEM FL

On drawings,abbr.for “cement floor.”

Cem.fin.

Abbr.for “cement finish.”

Cement Block

See concrete block.

Cement Grout

See grout.

Cement Gun

A device for applying cement mortar as a spray;uses compressed air as the propellant.

Cement Mixer

See concrete mixer.

Cement Mortar

A mixture of cement,lime,sand,or other aggregates with water;used for plastering over masonry or to lay blocks.The lime adds plasticity and resistance to moisture.Also see mortar.

Cementitious

Having cementing properties.

Cementitious Mixture

A mixture of mortar,concrete,or grout that contains hydraulic cement.