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Jack post

A type of structural support made of metal, which can be raised or lowered through a series of pins and a screw to meet the height required. Basically used as a replacement for an old supporting member in a building. See Mono-post.

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J Channel

Metal edging used on drywall to give the edge a better finished appearance when a wall is not "wrapped" Generally, basement stairway walls have drywall only on the stair side. J Channel is used on the vertical edge of the last drywall sheet

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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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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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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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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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