Nesting - A method of reroofing with new asphalt shingles over old shingles in which the top edge of the new shingle is butted against the bottom edge of the existing shingle tab.

No-cutout shingles -  Shingles consisting of a single, solid tab with no cutouts.

Non-veneer panel -  Any wood based panel that does not contain veneer and carries an APA span rating, such as wafer board or oriented strand board.

Normal slope application -  Method of installing asphalt shingles on roof slopes between 4 inches and 21 inches per foot.

NAILER - 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.

NEAT PLASTER - A base coat plaster which does not contain aggregates and is used where the addition of aggregates on the job is desired.

NEOPRENE – 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.

NM – 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.

NMC (Non Metallic Conduit) – 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.

NON-DESTRUCTIVE - A phrase describing a method of examining the interior of a component whereby no damage is done to the component itself.

NON-DRYING (Non-Curing) – A sealant that does not set up or cure. See Butyl.

NON-SAG – 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.

NON-SKINNING – Descriptive of a product that does not form a surface skin.

NON-STAINING – Characteristic of a compound that will not stain a surface.

NOZZLE – The tubular tip of a caulking gun through which the compound is extruded.

NUCLEAR METER - A device used to detect moisture by measuring slowed, deflected neutrons.

NAILER - 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.

NON-DESTRUCTIVE - A phrase describing a method of examining the interior of a component whereby no

damage is done to the component itself.

NUCLEAR METER - A device used to detect moisture by measuring slowed, deflected neutrons.