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Term Definition
E Value

The ratio of stress to strain.

Easement

A limited right, whether temporary or permanent, to use the property of another in a certain way. This may include the right of access to water, light and air, right-of-way, etc.

EER (Energy Efficiency Ratio)

The Btu output divided by the input in watts. The higher the EER the more efficient the equipment.

Effective Temperature

The sensation produced by the combined effects of temperature, relative humidity, and air movement.

Efflourescence

A white soluble salt deposit on the surface of concrete and masonry, usually caused by free alkalies leached from the mortar by moisture moving through it.

Effluent

Partially treated liquid sewage flowing from any part of a disposal system to a place of final disposition.

Elastic Deformation

The ability of a material to return to its original position after a load has been removed.

Elastic Limit

The greatest stress a material can withstand without permanent deformation upon the release of the stress.

Elasticity

The property of a material that causes it to return to its original shape upon removal of a deforming load.

Elastomer

A macromolecular material that returns to its approximate initial dimensions and shape after being subjected to substantial deformation.

Elastomeric

Having the properties of an elastomer.

Electric Conduction

The ability of a material to conduct an electric current.

Electric Current

The movement of electrons in an electric conductor.

Electric Current, Alternating

An electric current that reverses the direction of flow periodically.

Electric Current, Direct

An electric current that does not reverse its polarity.

Electric Power

The rate of generating, transferring, or using electric energy. It is expressed in watts (W) and kilowatts (kW).

Elevation

The vertical distance above sea level or other known point of reference.

Elevator

A hoisting and lowering mechanism equipped with an enclosed car that moves between floors in a building.

Elongation

Drawing out to a greater length when under load of expansion due to temperature increases.

Eminent Domain

The right of a government, under the police power concept, to take private property for public use.

Enamel

A classification of paints that dry to a hard flat semigloss or gloss finish.

Encroachment

Part of a building or an obstruction that extends into the property of another.

Epoxy Finish

A clear finish having excellent adhesion qualities, abrasion and chemical resistance, and water resistance.

Epoxy Resin

A class of synthetic thermosetting resins derived from certain special types of organic chemicals.

Equilibrium

The state of being equally balanced.

Equilibrium Moisture Content

The moisture content at which wood neither gains nor loses moisture when surrounded by air at a specified relative humidity and temperature.

Erection Plan

An assembly drawing showing where each structural steel member is located on the building frame.

Erosion

The process by which the surface of the earth is worn away by the action of natural elements, such as water and wind. Also referred to as Weathering.

Escalator

A continuous moving stair used to move people up and down between floors.

Evaporator

That part of a refrigerating system in which the refrigerant is evaporated, allowing it to absorb heat from the contactin heat source.

Evergreen

Having green leaves throughout the year, as opposed to deciduous.

Excavation

The digging or removal of earth.

Expansion Joint

A joint used to separate two parts of a building to allow expansion and contraction movement of the parts.

Expansive Soil

Clay that swells when wet and shrinks when dried.

Exposed Aggregate Finish

A finished concrete surface in which a coarse aggregate is exposed to view.

Exterior Insulation and Finish System

Exterior cladding assembly consisting of a polymer finish over a reinforcement adhered to foam plastic insulation that is fastened to masonry, concrete, building sheathing or directly to the structural framing. The sheathing may be cement board or gypsum sheathing.

Extrapolate

To project tested values, assuming a continuity of an established pattern, to obtain values beyond the limit of the test results. Not necessarily reliable.

Extruding

A process in which a billet of material is shaped into a strip having a uniform cross section by forcing the material through a die.