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J

Jack Rafter – A rafter that spans the distance from the wall plate to a hip, or from a valley to a ridge. – A rafter that spans the distance from the wall plate to a hip, or from a valley to a ridge.
Jamb – The side and head lining of a doorway, window, or other opening.
Joint – The space between the adjacent surfaces of two members or components joined and held together by nails, glue, cement, mortar, or other means.
Joint Cement – A powder that is usually mixed with water and used for joint treatment in gypsum- wallboard finish. Often called “spackle.”
Joist – One of a series of parallel beams, usually 2 inches in thickness, used to support floor and ceiling loads, and supported in turn by larger beams, girders, or bearing walls.