a condition where free water is present in a substance.

the temperature of air as registered by a thermometer whose bulb is covered by a water wetted wick.

the thickness, expressed in mils, of a coating or mastic as applied but not cured. For comparison, see Dry film thickness.

the process of moisture movement by capillary action. The ability of liquid to flow against gravity where liquid spontaneously rises in a narrow space such as a thin tube, or in porous materials such as paper or in some non-porous materials such as liquified carbon fibre.

a steep-slope roofing attachment device that fits over the butt end of tile, slate and stone to help secure individual roofing units from wind uplift.

force exerted by the wind on a structure or part of a structure. The NRCA Roofing and Waterproofing Manual—Fifth Edition Glossary 1009

the force caused by the deflection of wind at roof edges, roof peaks or obstructions, causing a drop in air pressure immediately above the roof surface.

a method of valley construction in which shingles or roofing from both sides of the valley extend across the valley and are woven together by overlapping alternate courses as they are applied.

a masonry wall, one masonry unit, a minimum of two inches thick.

in SPF-based roofing, the volume of foam per unit weight, normally expressed as board feet per pound or board feet per 1000 pounds

a member formed in the shape of a “Z” from coiled steel stock.

a hard bluish white metal, brittle at normal temperatures, very malleable and ductile when heated; not subject to corrosion; used for galvanizing sheet steel and iron, in various metal alloys, and as an oxide for white paint pigment.