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Base shoe

Molding used next to the floor on interior base board. Sometimes called a carpet strip.

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Bat

- A half-brick.

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Basement window inserts

The window frame and glass unit that is installed in the window buck.

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Batt

A section of fiber-glass or rock-wool insulation measuring 15 or 23 inches wide by four to eight feet long and various thicknesses. Sometimes "faced" (meaning to have a paper covering on one side) or "unfaced" (without paper).

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Batten

Narrow strips of wood used to cover joints or as decorative vertical members over plywood or wide boards. Narrow strip of wood, plastic, metal or gypsum board used to conceal an open joint.

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Batch

The amount of concrete mixed at one time.

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BCMC

Board for the Coordination of Model Codes; part of the Council of American Building Officials Association (CABO).

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Bay window

Any window space projecting outward from the walls of a building, either square or polygonal in plan.

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Beam

A structural member transversely supporting a load. A structural member carrying building loads (weight) from one support to another. Sometimes called a "girder". A straight horizontal structural loadbearing member spanning a distance between supports.

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Bauxite

Ore containing high percentages of aluminum oxide.

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Bearing partition

A partition that supports any vertical load in addition to its own weight.

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Bearing Pile

A pile that carries a vertical load.

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Bearing header

(a) A beam placed perpendicular to joists and to which joists are nailed in framing for a chimney, stairway, or other opening. (b) A wood lintel. (c) The horizontal structural member over an opening (for example over a door or window).