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Jamb

The side and head lining of a doorway, window, or other opening. Includes studs as well as the frame and trim. One of the finished upright sides of a door or window frame.

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Joint

The location between the touching surfaces of two members or components joined and held together by nails, glue, cement, mortar, or other means.

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Joint cement or Joint compound

A powder that is usually mixed with water and used for joint treatment in gypsum-wallboard finish. Often called "spackle" or drywall mud.

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Joint tenancy

A form of ownership in which the tenants own a property equally. If one dies, the other automatically inherits the entire property.

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Jamb Stud

Wood or metal stud adjacent to the door jamb.

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Joint Compound

A plastic gypsum mixture used to cover the joints and fasteners in gypsum wallboard installations.

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Jointing

Forming control joints in a concrete slab.

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Joist

Wooden 2 X 8's, 10's, or 12's that run parallel to one another and support a floor or ceiling, and supported in turn by larger beams, girders, or bearing walls. Small beam that supports part of the floor, ceiling or roof of a building.

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Joint trench

When the electric company and telephone company dig one trench and "drop" both of their service lines in.

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Joist Hanger

A metal "U" shaped item used to support the end of a floor joist and attached with hardened nails to another bearing joist or beam. Metal shape formed for hanging on the main beam to provide support for the end of a joist.

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Keene's Cement

A hard, high-strength, white, quick-setting finishing plaster made from burnt gypsum and alum.

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Jute

A coarse fiber obtained from two East Indian tiliaceous plants.

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Keeper

The metal latch plate in a door frame into which a doorknob plunger latches.

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Jumpers

Water pipe installed in a water meter pit (before the water meter is installed), or electric wire that is installed in the electric house panel meter socket before the meter is installed. This is sometimes illegal.

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Keyless

A plastic or porcelain light fixture that operates by a pull string. Generally found in the basement, crawl space , and attic areas.

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Kiln-Dried Lumber

Lumber that has been dried and seasoned with carefully controlled heat in a kiln.

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Kiln

(1) A chamber with controlled humidity, temperature, and airflow in which lumber is dried.(2) A low-pressure steam room in which green concrete units are cured.

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Kilowatt (kw)

One thousand watts. A kilowatt hour is the base unit used in measuring electrical consumption. Also see watt.

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Keyway

A slot formed and poured on a footer or in a foundation wall when another wall will be installed at the slot location. This gives additional strength to the joint/meeting point.