Bird's-mouth

Bird's-mouth

The notch in a rafter that rests on the top plate of a wall.

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Part of Speech: noun
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Industry/Domain: Building materials
Category: Lumber
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Related terms

bird's mouth

Construction; Carpentry

Notch cut on the underside of a rafter to allow fit into the top plate. If rafter ends flush with the top plate rather than overhangs, then not a full notch.

bird's mouth

Construction; Framing

A V-shaped notch that resembles a bird's open beak. It is cut into the base of a rafter and received by the plate.

bird's-mouth

Building materials; Lumber

The notch in a rafter that rests on the top plate of a wall.

bird's-mouth joint

Construction; Bridge

A joint in timber where an inclined member is dapped over a horizontal member.

air space

Building materials; Lumber

The area between insulation facing and interior of exterior wall coverings. For best results, manufacturers recommend filling this space with insulation and allowing at least 3/4" ...

annual ring

Building materials; Lumber

The rings that are generated each year as a tree grows. The age of the tree can be determined by counting the growth rings. The size of the rings can also indicate what type of ...

compression web

Building materials; Lumber

A member of a truss which connects the bottom and top chords and provides downward support.

conifer

Building materials; Lumber

Conifer species are trees or shrubs of the evergreen variety that bear cones. An example would be the pine.

coniferous forests

Building materials; Lumber

Forests comprised of mostly cone bearing trees such as pine forests.

convection

Building materials; Lumber

Currents created by heating air, which then rises and pulls cooler air behind it.

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dutch angle

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