Glossary of building terms: O

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Outrigger– An extension of a rafter beyond the wall line. Usually a smaller member nailed to a larger rafter to form a cornice or roof overhang.

Outside corner– The point at which two walls form an external angle, one you usually can walk around.

Overhang– Outward projecting eave-soffit area of a roof; the part of the roof that hangs out or over the outside wall.

Overhang (Timber Roof Structures) – extension of the top chord of a truss, measured horizontally from the end of the bottom chord.