Architectural and Engineering Glossary

I

Inside Corner Molding

A molding covering the joint at the internal angle of two intersecting surfaces,as the metal coves used with plastic laminates,etc.
 

Inside Finish

See interior trim.

Inside Glazing

External glazing which is installed from inside the building.Also see internal glazing.

Inside Lining

See inside casing.

Inside Micrometer

A micrometer especially designed for the accurate measurement of the inside diameter of a cylinder,such as a pipe.

Inside Stop,bead Stop,inner Bead,stop Bead,window Bead,window Stop

In a double-hung window,a strip of wood fixed to the casing,along the inner edge of the inner sash;restricts the motion of the sash to a vertical plane.

Inside Thread

The thread on the inside of a pipe,fitting,or machine screw.

Inside Trim

1.Any trim on the interior of a building.2.Trim around door or window openings;also called inside casing.

Inside-angle Tool

A float used in shaping inside angles in plastering and masonry.

Inside-door Lock,room-door Lock

A lock having a spring bolt (operated by a knob) and a dead bolt operated by a key.

Insoluble Residue

That portion of an aggregate or cement which is not soluble in diluted hydrochloric acid.

Inspection

1.Examination of work completed or in progress to determine its compliance with contract requirements.2.Examination of the work by a public official,owner’s representative,or others.3.The process of measuring or checking materials,workmanship,or methods for conformance with quality controls,specifications,and/or standards.

Inspection Chamber

A shallow manhole. 

Inspection Eye

Same as cleanout. 

Inspection Fitting

Same as cleanout. 

Inspection Junction

Same as cleanout. 

Inspection List

A list of items of work to be completed or corrected by the contractor.
 

Inspector

1.See building inspector.2.See owner’s inspector.3.See resident engineer.

Instability

In a structure,the sudden loss of stiffness that limits its load-carrying capability,and  in some cases results in the structure’s failure.

Instal

Abbr.for “install” or “installation.”

Instant Lock

A lock which is actuated automatically (by a spring) as the door is closed.

Instant-start Fluorescent Lamp

A fluorescent lamp designed to be started by high voltage without preheating of the electrodes;usually has single-pin base connections;a slimline lamp.

Instantaneous-type Water Heater

A heater in which there is an exceedingly rapid increase  in water temperature as the water flows through tubes surrounding an electric heating coil;best suited for applications requiring a continuous flow of hot water.Must be used with care when the demand is low because accurate temperature control at low flow rates usually is poor.

InstCES

Abbr.for “Institution of Civil Engineering Surveyors.”

Institute Of Electrical And Electronic Engineers

(IEEE) A professional organization of electrical engineers having its headquarters in Piscataway,NJ 08855.

Institution Of Electrical Engineers

(IEE) A professional organization of electrical,electronic,and systems engineers having its head quarters at Savoy Place,London WC2R OBL.

Institution Of Structural Engineers

A professional organization of structural engineers having its headquarters at 11 Upper Belgravia Street, London 5W1 8BH.

Institutional Occupancy

The use of a building for the medical treatment or care of persons suffering from illness or infirmity;for the care of infants,convalescents,or aged persons;or for penal or corrective purposes.

Instructions To Bidders

Instructions contained in the bidding requirements for preparing and submitting bids for a construction project.Also see notice to bidders.

Instructions To Tenderers

Same as notice to bidders.

Insul

Abbr. for “insulate” or “insulation.”

Insula

1.In Roman town planning,a block of buildings surrounded by streets.2.A Roman apartment house occupying such a block.

Insulated Flange

A coupling used in metal pipes to interrupt the electrical transmission path that would otherwise exist.

Insulating Board

See board insulation.

Insulating Cement

1.A  combination of hydraulic-setting cement (or other bonding ingredient) and a loose-fill insulation,mixed to a workable putty-like consistency;used in insulation applications to fill voids,joints,etc.2.A mixture of dry granular,fibrous,flaky,or powdery materials that develops a plastic consistency when mixed with water,and when dried in place;forms a coherent covering that provides substantial resistance to heat transmission.
 
 

Insulating Concrete

Concrete having low thermal conductivity;used as thermal insulation. 

Insulating Fiberboard

Fibrous insulating material (such as wood,cane,or other vegetable fibers) and binder,formed into a board.Manufactured units vary widely in thickness,linear dimensions,density,thermal resistance,and mechanical strength.
 

Insulating Form Board

Insulation board used as a permanent form for poured-in-place gypsum or lightweight concrete roof decks.

Insulating Glass

Two sheets of glass that are assembled and sealed around their edges as a single unit;the space between the glass sheets is dehydrated or filled with a gas.Such a unit is effective in reducing the transfer of heat through it.

Insulating Glass Unit

A panel of double glazing which is sealed around its periphery;provides increased resistance against the transmission of heat and sound.

Insulating Material

See electrical insulation,thermal insulation.

Insulating Oil

A type of oil used within the enclosure of a transformer,switch,or other electric device,for insulating and cooling purposes.

Insulating Plasterboard

See foil-backed gypsum board.

Insulating Strip

An expansion strip.

Insulating Varnish

A varnish used as insulator on wire or electric circuits.

Insulation

See electrical insulation,sound insulation,thermal insulation.

Insulation Board

See board insulation.

Insulation Lath

Gypsum lath having an aluminum foil laminated to its back in order to provide a vapor barrier and reflective insulation against thermal losses.

Insulation Resistance

The resistance to the flow of current through an insulating material resulting from an impressed direct voltage;usually expressed in ohms.

Insulation Test

A test to determine the resistance of electrical insulation to the flow of direct current.