Head Joint
1. A joint between two pieces of timber which are joined in a straight line, end to end.
2. A masonry joint formed between two stones in the same course. *
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Header
Masonry unit, laid so that its ends are exposed, overlapping two or more adjacent withes of masonry and tying them together. *
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Header Bond
Brickwork formed by a course of headers, as in common bond. *
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Hearth 
1. The floor of a fireplace (usually brick, tile or stone) together with an adjacent area of fireproof material.
2. An area permanently floored with fireproof material beneath and surrounding a stove. *
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Hollow Masonry Wall
An exterior wall, usually of masonry, consisting of an outer and inner with separated by a continuous air space, but connected together by wire or sheet-metal ties. The dead air space provides improved thermal insulation. *
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