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Nailer
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A piece of lumber secured to non-nailable decks and walls by bolts or other means, which provides a suitable backing onto which roof components may be mechanically fastened.
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Natural Finish
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A transparent finish which does not seriously alter the original color or grain of the natural wood. Natural finishes are usually provided by sealers, oils, varnishes, water-repellent preservatives, and other similar materials.
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Neat Plaster
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A base coat plaster which does not contain aggregates and is used where the addition of aggregates on the job is desired.
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Neoprene
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A synthetic rubber having physical properties closely resembling those of natural rubber. It is made by polymerizing chloroprenes, and the latter is produced from acetylene and hydrogen chloride.
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Newel
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A post to which the end of a stair railing or balustrade is fastened. Also, any post to which a railing or balustrade is fastened.
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New Frontier
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Rough Sawn siding using 2x8 or 2x10 timbers. Finish off by chinking or caulking between courses and corners are typically a vertical timber.
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NM
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A type of Romex cable (nonmetallic sheathed cable that contains several conductors). The cable, which is flame-retardant, is limited to use in dry locations only and can not be exposed to excessive moisture.
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NMC (Non Metallic Conduit)
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A type of Romex cable (nonmetallic sheathed cable that contains several conductors). NMC may be used in damp or corrosive locations as well as dry areas.
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Nominal Dimension
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An approximate dimension assigned to material as a convenience of reference
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Non-Load Bearing Wall
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A wall supporting no load other than its own weight.
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Non-Destructive
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A phrase describing a method of examining the interior of a component whereby no damage is done to the component itself.
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Non-Drying (Non-Curing)
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A sealant that does not set up or cure. See Butyl.
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Non-Sag
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A sealant formulation having a consistency that will permit application in vertical joints without appreciable sagging or slumping. A performance characteristic which allows the sealant to be installed in a sloped or vertical joint application without appreciable sagging or slumping.
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Non-Skinning
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Descriptive of a product that does not form a surface skin.
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Non-Staining
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Characteristic of a compound that will not stain a surface.
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Nosing
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The projecting edge of a molding or drip. Usually applied to the projecting molding on the edge of a stair tread.
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Notch
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A crosswise rabbet at the end of a board.
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Nozzle
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The tubular tip of a caulking gun through which the compound is extruded.
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Nuclear Meter
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A device used to detect moisture by measuring slowed, deflected neutrons.
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