H definitions - Building Terms Dictionary



H definitions - Do you know architectual drafting or building terms starting with the letter "H"?

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Hammerhead Boom Crane:
A heavy-duty lifting device that uses a tower-mounted horizontal boom that may rotate only in a horizontal plane.
Hardboard:
A very dense panel product,usually with at least one smooth face, made of highly compressed wood fibers.

Hawk:
A square piece of sheet metal with a perpendicular handle beneath, used by a plasterer to hold a small quantity of wet plaster and transfer it to a towel for application to a wall or ceiling.

Header:
lintel; band joist; a joist that supports other joists; in steel construction a beam that spans between girders; a brick or other masnory unit that is laid across two wyths with its end exposed in the face of the wall.

Head Joint:
The vertical layer of mortar between ends of masonry units.

Hearth:
The noncombustible floor area outside a fireplace opening.

Heartwood:
The dead wood cells in the center region of a tree trunck.

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Heat-fuse:
To join by softening or melting the edges with heat and pressing them together.

Heat of hydration:
The thermal energy given off by concrete or gypsum as it cures.

Heat-strengthened Glass:
Glass that has been strengthened by heat treatment, though not to as great an extent as temered glass.

Heaving:
The forcing upward of ground or buildings by the action of frost or pile driving.

High-lift GROUTING:
A method of constructing a reinforced masonry wall in which the reinforcing bars are embedded in grout in story-high increments.

High-range:
A sealant that is capable of a high degree of elongation without rupture.

High-strength Bolt:
A bolt designed to connect steel members by clamping them together with sufficient force that the load is transferred between them by friction.

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Hip:
The diagonal intersection of planes in a hip roof.

Hip Roof:
A roof consisting of four slopping planes that intersect to form a pyramidal or elongated pyramid shape.

Hollow Concrete Masonry:
Concrete masonry units that are manufactured with open cores, such as ordinary concrete blocks.

Hollow-core Door:
A door consisting of two face veneers seperated by an airspace, with solid wood spacers around the four edges. The face veneers are usually connected by a grid of thin spaces within the sirspace.

Holow-core slab:
A precast concrete slab element that has internal longitudinal cavities to reduce its self-weight.

Hook:
A semicircular bend in the end of a reinforcing bar, made for the purpose of anchoring the end of the bar securely into the surrounding concrete.

Hopper Window:
A window whose sash pivots on an axis along or near the sill, and that opens by tilting toward the interior of the building.

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Horizontal Face:
A force whose direction of action is horizontal or nearly horizontal. ( see also LATERAL FORCE.)

Hose Test:
A standard laboratory test to determine the relative ability of an interior building assembly to stand up to water from a fire hose during a fire.

Hot-rolled Steel:
Steel formed into its final shape by passing it between rollers while it is very hot.

Hydrated Lime:
Calcium hydroxide produced by burning clacium carbonate to form calcium oxide (quick lime), then allowing the calcium oxide to combine chemically with water.

Hydration:
A process of combining chemically with water to form molecules or crystals that include hydroxide redicals or water of crystallization.

Hydronic Heating System:
A system that circulates warm water through convectors to heat a building.

Hydrostatic Pressure:
Pressure exerted by standing water.

Hygrosopic:
Readily absorbing and retaining moisture.

Hyperbolic Paraboloid Shell:
A concrete roof structure with a saddle shape.


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