Glossary of Terms

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Glossaries

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Term Definition
Cantilever

A projecting beam or joist, not supported at one end, used to support an extension of a structure. 

A beam or other structure projecting from a wall and supporting an extension to a building, as on a cantilevered balcony or upper store.

Casing

Door and window framing.

CCA

Chromated Copper Arsenate - a preservative treatment normally used on easily treated wood specie such as  Southern Yellow Pine Hem-Fir or Ponderosa Pine.

Clapboard

A long thin board, thicker on one edge, overlapped and nailed on for exterior siding.

Clear height

Vertical distance between the finished floor and the lowest part of a truss, rafter, or girder.

Clear span

Horizontal distance from the face of one support to the face of the opposite support.

Collar

Foundation component attached below grade to an embedded post or pier, and that moves with it to resist lateral and vertical loads.

Compression edge bracing

A compression edge brace may be used to support the bottom edge of a stacked rafter at locations near interior supports. In this case, the brace would be a diagonal member that connects the bottom edge of the rafter to nearby purlins.

Compression-edge brace

A brace used to provide lateral support to the compressive edge of a beam or column. More commonly referred to as flange brace when used to support the compressive edge of an I-shaped section.

Concrete

An artificial building material made by mixing cement and sand with gravel, broken stone, or other aggregate plus sufficient water to cause the cement to set and bind the entire mass.

Carbonate aggregate. Concrete made with aggregates consisting mainly of calcium or magnesium carbonate, such as limestone or dolomite, and containing 40 percent or less quartz, chert or flint.

Cellular. A lightweight insulating concrete made by mixing a preformed foam with Portland cement slurry and having a dry unit weight of approximately 30 pcf (480 kg/m3).

Lightweight aggregate. Concrete made with aggregates of expanded clay, shale, slag or slate or sintered fly ash or any natural lightweight aggregate meeting ASTM C 330 and possessing equivalent fire-resistance properties and weighing 85 to 115 pcf (1360 to 1840 kg/m3).

Perlite. A lightweight insulating concrete having a dry unit weight of approximately 30 pcf (480 kg/m3) made with perlite concrete aggregate. Perlite aggregate is produced from a volcanic rock which, when heated, expands to form a glass-like material of cellular structure.

Sand-lightweight. Concrete made with a combination of expanded clay, shale, slag, slate, sintered fly ash, or any natural lightweight aggregate meeting ASTM C 330 and possessing equivalent fire-resistance properties and natural sand. Its unit weight is generally between 105 and 120 pcf (1680 and 1920 kg/m3).

Siliceous aggregate. Concrete made with normal-weight aggregates consisting mainly of silica or compounds other than calcium or magnesium carbonate, which contains more than 40-percent quartz, chert or flint.

Vermiculite. A light weight insulating concrete made with vermiculite concrete aggregate which is laminated micaceous material produced by expanding the ore at high temperatures. When added to a Portland cement slurry the resulting concrete has a dry unit weight of approximately 30 pcf (480 kg/m3).

Continuous lateral restraint (CLR)

An uninterrupted row of structural framing members connecting a series of trusses. The row is perpendicular to truss members and thus provides lateral support to the truss members it connects.

Crawl Space

A shallow, unfinished space beneath the first floor of a house which has no basement, used for visual inspection and access to pipes and ducts. Also, a shallow space in the attic, immediately under the roof.

Cripples

Cut-off framing members above and below windows.

Cupola

A feature at the top of a roof, usually Box-shaped and opened by louvers or vents.

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