26 September 2006
Slope. Tangent of the angle between the roof surface and the horizontal plane,
expressed as a ratio. (See also roof slope)
Smooth Surfaced Roof. A roof membrane without mineral aggregate surfacing.
Soffit. The underside covering of any exterior overhanging section of a roof, gable or
Softening Point. Temperature at which a bitumen becomes soft enough to flow as
determined by an arbitrary, closely defined method.
Square. A roof area of 9.29 m2 (100 ft2), or enough material to cover 9.29 m2 of deck.
Stack Vent. A vertical outlet designed to relieve pressure exerted by water vapor
between a membrane and the vapor retarder or deck.
of steel which contains
a high percentage
of chromium. Also
may contain nickel or copper. Has excellent resistance to corrosion.
Standing Seam. Watertight seam type featuring an upturned rib, which may also be
structural. It is made by turning up the edges of two adjacent metal panels and then
folding them over in one of a variety of ways.
Stress. (1) A measure of the load on a structural member in terms of force per unit
area (MPa) (kips per in.2); (2) The force acting across a unit area in solid material in
resisting the separation, compacting or sliding that tends to be induced by external
forces. Also the ratio of applied load to the initial cross sectional area, or the maximum
stress in the outer fibers due to an applied flexural load.
Stress Concentration. A condition in which stress is highly localized, usually induced
by an abrupt change in the shape of a member or at a substrate joint (e.g., between
Substantial Completion. The stage in the progress of the work when it is sufficiently
complete for the owner to occupy or utilize the space for its intended use.
Surface Cure. Curing or vulcanization which occurs in a thin layer on the surface of a
manufactured polymeric sheet or other items.
Susceptibility. When not otherwise qualified, the degree of change in viscosity with
Tearoff. Removal of a failed roof system down to the structural deck surface.
Tensile Strength. (1) The maximum tensile stress per unit of original cross sectional
area applied during stretching of a specimen to break; units: SI-metric--Megapascal or
kilopascal, customary--lb per in.2; (2) The longitudinal pulling stress a material can bear
without tearing apart; (3) The ratio of maximum load to original cross-sectional area.
Also called ultimate strength.