MIL-HDBK-1001/SA
Single-ply membrane. A membrane, either sheet or fluid-applied, with only a single layer of material designed to prevent water intrusion into the building.
Skater's cracks. Curved cracks observed in smooth-surfaced built-up membranes
Slag. Porous aggregate used as built-up bituminous membrane surfacing, comprising silicates and alumino-silicates of calcium and other bases, developed with iron with a blast furnace.
Slippage. Relative lateral movement of adjacent felt plies in a membrane. It occurs mainly in sloped roofing membranes, exposing the lower plies, or even the base ply, to the weather.
Slope. The tangent of the angle between the roof surface and the horizontal, in inches per foot. The Asphalt Roofing Manufacturers' Association ranks slopes as follows:
Level: 1/2-inch maximum
Low slope: over 1/2 inch up to 1-1/2 inches
Steep slope: over 1-1/2 inches
Smooth-surfaced roof. A roofing membrane surfaced with a layer of hot-mopped asphalt or cold-applied asphalt-clay emulsion or asphalt cutback, or sometimes with an unmopped, inorganic felt.
Softening point. Temperature at which bitumen becomes soft enough to flow, as measured by standard laboratory test in which a steel ball falls a measured distance through a disk made of the tested bitumen.
Softening point drift. Change in softening point from temperature change during storage or application (see also Fallback).
Solid mopping. See Mopping.
Split. Membrane tear resulting from tensile stress.
Spot mopping. See Mopping.
Sprinkle mopping. See Mopping.
Spudder. Heavy steel implement with a dull, bevel-edged blade designed to remove embedded aggregate from a membrane surface (also called a Scraper).
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