Architectural and Engineering Glossary

E

End-bedded

Same as face-bedded.

Endbeam

See beam.

Endboard

A wood board that closes off the end of a cornice where there is no cornice return.

Exhaust Grille

A grille through which air is exhausted from a conditioned space to the atmosphere.

Exhaust Opening

An exhaust grille or any type of opening through which air is exhausted from a space.

Exhaust Shaft

An outlet duct from an exhaust fan through which foul air or gases are expelled to the atmosphere.

Exhaust Ventilation

The removal of foul air from a space by a mechanical means,such as a fan;fresh air is allowed to enter through available or controlled openings.

EXIST

On drawings,abbr.for “existing.”

Existing Building

In regulations and in codes,a building which is already completed or which may be built under prior laws or regulations.

Existing Grade

The grade 2 prior to excavation or filling.

Exit

That portion of a means of egress which is separated from the rest of a building by walls,floors,doors,or other means and which provides a reasonably protected path of escape for the occupants of a building in the event of fire.

Exit Access

That portion of a means of egress which leads to an exit.
 

Exit Corridor

A corridor or enclosed passageway connecting a stairway,fire tower,or other required exit with a street or alley or with an open space communicating with a street or alley. 

Exit Court

A yard or court providing egress to a public way for one or more required exits.
 

Exit Device

See panic exit device.

Exit Discharge

That portion of a means of egress between the termination of the exit at the exterior of a building and the ground level.

Exit Door

A door that leads to an escape route to the exterior in case of fire;the door must carry an exit sign that conforms with the applicable code. 

Exit Light

An illuminated sign used to identi an exit.
 

Exit Passageway

An enclosed means of egress connecting a required exit or exit court with a public way.

Exonarthex

The narthex nearest the entrance,when two are present.

Exostes

A loggia having a balcony.

Exothermic

Said of a reaction that occurs with the evolution of heat.

Exotic Plant

A plant that is not native to the locality or region in which it is being grown.

Expanded Cement

See expansive cement.

Expanded Clay

Clay which has been heated to a semiplastic condition and expanded to many times its original volume by the formation of internal gas;used as a lightweight aggregate.

Expanded Corner Bead

A corner bead having wide expanded flanges that are easily flexed;provides increased reinforcement.

Expanded Glass

See foam glass.

Expanded Metal

A type of metal lath having an open mesh formed by slitting metal sheet;made in various patterns and metal thicknesses,with either a flat or an irregular surface.

Expanded Shale

Shale which has been heattreated so that it expands to many times its original volume;used as a lightweight aggregate.
 

Expanding Bit

Same as expansion bit.

Expanding Cement

Same as expansive cement. 

Expanding Pile

A pile provided with a mechanical device at its lower end to expand the bottom so as to provide greater bearing and a higher resistance to uplift.
 

Expanding Vault

A conical vault.

Expansion

The increase in length or volume of a material,or a body,caused by temperature,moisture,or other environmental condition.

Expansion Attic

An unfinished attic in a completed house,capable of being converted into livable area.

Expansion Bearing

A support at the end of a span where provision is made for the expansion and contraction of the structure.

Expansion Loop

See expansion bend. 

Expansion Shield

Same as expansion bolt. 

Expansion Sleeve

A pipe sleeve which permits movement of the element that it houses.