Glossary of Home/Building Structural Components

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The following terms define Building and Machine Parts

- J -

jack: brace, support.

jack rafter: shorter-than-common rafter.

jamb: side frame of door or window in wall.

jib: projecting crane arm.

joggle: joint formed between notch cut in one surface and projection made in another, usually in wood or stone.

joint: point of contact between elements, usually held by glue, nail, or screw.

joist: horizontal support beam for floor or ceiling.

journal: portion of shaft or axle contained by bearing.