MIL-HDBK-1001/SA
Spot mopping A pattern of hot bitumen application in roughly circular areas, generally about 18-inch diameter, on a grid of unmopped, perpendicular bands.
Strip mopping A mopping pattern featuring parallel mopped bands.
Sprinkle mopping A random pattern of bitumen beads hurled onto the substrate from a broom, mop, or machine.
Nailer. A wood member bolted or otherwise anchored to a deck or wall to provide nailing anchorage of membrane roof felts or flashings.
Neoprene. A synthetic rubber (chemically polychloroprene) used in fluid or sheet-applied elastomeric single-ply roof membranes or flashing.
One-on-one. Non-shingled application pattern of a single ply of felt followed by application of a second ply (see Phased application).
Organic. Carbon and hydrogen atom matter of plant or animal origin.
Parting Agent. Powdered mineral (talc, mica, etc.) placed on coated felts to prevent adhesion of concentric felt layers in the roll (sometimes called a releasing agent or anti-stick compound).
Perlite. An aggregate used in lightweight insulating concrete and in preformed insulating board, formed by heating and expanding siliceous volcanic glass.
Perm. A unit of water-vapor transmission, defined as 1 grain of water vapor per square foot per hour per inch of mercury pressure difference. (1 in. Hg = 0.491 psi.)
Permeance. An index of a material's resistance to water-vapor transmission. (See Perm)
Phased application. The practice of applying the felt plies of a roofing or waterproofing membrane in two or more operations.
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