Roofing Terminology
(Click on a letter to learn more)
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Nailing
In the exposed nail method, nail heads are exposed to the weather; In the concealed nail method, nail heads are concealed from the weather.
Neoprene
A synthetic rubber 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.
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