CONSTRUCTION DICTIONARY

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JACK RAFTER:
A rafter is one of the parallel structural members of a roof that form the sloped part of the roof itself. A jack rafter is a rafter that spans the distance from the outside wall to the central peak of the roof.

JAMB:
The material that makes up the side and top lining of either a door frame or window frame.

JOINT:
A connection of two pieces of material by some specific method.

JOINTER:
A wood planing machine that planes one edge or surface of a board at a time to a predetermined thickness.

JOIST:
One of a series of parallel boards or planks used to form a floor or ceiling onto which the floor or ceiling surface is attached.

JOIST HANGERS:
The metal brackets used to connect joists to the adjoining headers or support beams. As opposed to using ledger boards on a ledger beam. See "LEDGER BEAM".