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N
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.
Natural
Finish: 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.
Neat Plaster:
A base coat plaster which does not contain aggregates
and is used where the addition of aggregates on the job
is desired.
NEC (National
Electrical Code): A set of rules governing safe
wiring methods. Local codes—which are backed by law—may
differ from the NEC in some ways.
Neoprene:
A synthetic rubber having physical properties
closely resembling those of natural rubber. It is made by
polymerizing chloroprenes, which are produced from acetylene
and hydrogen chloride.
Nesting:
A method of re-roofing with new asphalt shingles
over old shingles in which the top edge of the new shingles
is butted against the bottom edge of the existing shingle
tab.
Neutral
Wire: Usually color-coded white, the neutral wire
carries electricity from an outlet back to the service panel.
Also see Hot Wire and Ground.
Newel:
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.
Nipple:
A short pipe installed between fittings. A pipe
coupling that is threaded on both ends.
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.
No-Cutout
Shingles: Shingles consisting of a single, solid
tab with no cutouts.
Nominal
Size: Size used for identification only; not literal
dimensions.
Non-Bearing
Wall: A wall supporting no load other than its
own weight.
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-fibered
Aluminum Roof Coating: Thin but efficient reflective
barrier to reflect sun's harmful rays and prolong surface
life. Also works on metal surfaces.
Non-Sag:
A sealant formulation having a consistency that
will permit application in vertical joints without appreciable
sagging or slumping. This performance characteristic 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.
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.
Nonfibered
Roof and Foundation Coating: Dual purposed, this
thin-viscosity material doubles as a nonfibered roof or
foundation
coating.
Normal
Slope Application: Method of installing asphalt
shingles on roof slopes between 4 inches and 21 inches per
foot.
Nosing:
The projecting edge of a molding or drip. Usually
applied to the projecting molding on the edge of a stair
tread.
Notch:
A crosswise rabbet at the end of a board.
Note:
A formal document showing the existence of a debt and stating
the terms of repayment.
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.
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