Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Strip Mopping: a mopping pattern in which hot bitumen is applied in parallel bands.
Mud Cracking: surface cracking of surface material resembling dried cracked earthen mud.
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.
Orange Peel: a surface condition that shows a fine texture resembling the texture of an orange.
Organic: being or composed of hydrocarbons or their derivatives, or matter of plant, or animal origin.
Parapet Wall: perimeter wall, which extends above the roof.
Peel Strength: average force required to peel a membrane from the substrate to which it has been bonded.
Penetration: any object passing through the roof.
Perlite: an aggregate used in lightweight insulation concrete and in preformed perlitic insulation board, formed by heating and expanding siliceous volcanic.
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