| Nailing |
(1) in
the Exposed Nail Method, nail heads are exposed to
the weather; (2) in the Concealed Nail Method, nail
heads are concealed from the weather.
|
| Neoprene |
a synthetic rubber (polychloroprene)
used in liquid-applied and sheet applied elastomeric
roof membranes or flashings. |
| Night Seal |
method used to temporarily seal
a membrane edge during construction to protect the
roof assembly from water penetration. |
| Nineteen-Inch Selvage |
a prepared roofing sheet with
a 17-inch granule surfaced edge. This material is sometimes
referred to as SIS or as Wide-Selvage Asphalt Roll
Roofing Material Surfaced with Mineral Granules. |
| Ninety-Pound |
a prepared organic felt roll
with granule surfacing what has a mass of approximately
90 pounds per 100 square feet. |
| Nitrile Rubber |
a membrane whose predominant
resinous ingredient is a synthetic rubber made by the
polymerization of acrylonitrile with butadiene. |
| Non-Friable |
a material that, when dry, cannot
be crumbled, pulverized or reduced to powder by hand
pressure. |
| Non-Vulcanized Membrane |
a membrane manufactured from thermoplastic
compounds that retain its thermoplastic properties throughout
its service life. |
| Nuclear Testing |
a device that contains a radioactive
source to emit high velocity neutrons into a roof system.
Reflected neutrons are measured to ascertain presence
of moisture. |
