WELCOME TO OUR Building dictionary : Noise to normal weight concrete PROJECT
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Summary: Building dicitonary to explain building jargon and terminology from A - Z.
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Building dictionary for the letter N - Page 3
Noise
In closed-circuit television, interference detected on a cable circuit that reduces or destroys the clarity of the signal. Sometimes called snow.
Noise insulation
Sound-absorbing materials installed in partitions, doors, windows, ceilings, and floors.
Nominal
Name given to standard pipe size designations through 300mm nominal O.D. For example, 50mm nominal is 60mm O.D.
Nominal diameter
The size designation that specifies the size of a pipe, bolt, reinforcing bar, or rive. The actual dimension may vary.
Nominal dimension
(1) The size designation for most timber, plywood, and other panel products. In timber, the nominal size is usually greater than the actual dimension, thus, a kiln-dried 100mm x 50mm ordinarily is surfaced to 90mm x 45mm. In panel products, the size is generally stated in metres for surface dimensions and millimetres for thickness. Product standards permit various tolerances for the latter, varying according to the type and nominal thickness of the panel. (2) In masonry, a dimension larger than the one specified for the masonry unit by the thickness of a joint.
Nominal mix
The proportions of the constituents of a proposed concrete mix.
Nominal size
The dimensions of sawn timber before it is surfaced and dried. See also nominal dimension.
Non load bearing wall
A wall designed to carry no load other than its own weight.
Noncohesive soil
A soil in which the particles do not stick together, such as sand or gravel.
Noncombustible
Any material which will neither ignite nor actively support combustion in air at a temperature of 650 degrees (C) when exposed to fire.
Nonconductor
A material that does not easily conduct electric current. Such materials are used as insulators.
Nonconforming
A building, or the use of a building, that does not comply with existing laws, rules, regulations, or codes.
Nonconforming uses
Existing uses of land or structures which do not conform to local zoning ordinances.
Nonconforming work
Work that does not fulfill the contractually agreed upon requirements.
Nondestructive testing
The examination of an object with technology that does not affect the object\'s future usefulness. Applications include the evaluation of the strength of concrete or a weld using ultrasonic measures.
Nonferrous
A term referring to any metal or alloy that does not contain iron, such as brass or copper.
Nonflammable
A material which will not burn with a flame.
Nonreturn valve
A check valve that allows flow in only one direction.
Nonslip floor
A concrete floor surface treated with carborundum powder, iron filings, or other material to improve its traction qualities, especially when wet. The surface may also be brushed before the concrete sets to create a rough finish.
Normal weight concrete
See concrete; normal weight.
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