26 September 2006
Scupper. Channel through a low slope roof edge or parapet, designed for peripheral
drainage of the roof, usually a safety overflow to limit accumulation of ponded rainwater
caused by clogged drains or intense rainfall.
Scrim. A woven, open mesh reinforcing fabric made from continuous filament yarn.
Used in the reinforcement of polymeric sheeting.
Sealant. Any material used to close up cracks or joints to protect against leaks. Lap
sealant is applied to exposed lap edges in E/P systems.
Sealing Washer. A metal-backed rubber washer assembled on a screw to prevent
water from migrating through the screw hole.
Seam Strength. Strength of a seam of material measured either in shear or peel
modes, reported either in absolute units, e.g., pounds per inch of width--or as a percent
of the sheeting strength.
Service Life. Anticipated useful life of a building, building component or building
subsystem (e.g., roof system).
Shelf Life. Maximum safe time to store a fluid construction material or non-cured sheet
Shingle. (1) A small unit of prepared roofing designed for installation with similar units
on overlapping rows on inclines normally exceeding 25%; (2) To cover with shingles,
and (3) To apply any sheet material in overlapping rows like shingles.
Shingling. (1) The procedure of laying parallel felts so that one longitudinal edge of
each felt overlaps, and the other longitudinal edge underlaps an adjacent felt. (See also
Ply). Normally, felts are shingled on a slope so that the water flows over rather than
against each lap; (2) The application of shingles to a sloped roof.
SI. The international symbol for the metric unit (Le Systeme International d'Unites).
Sidelap. The continuous overlap of closures along the side of a panel or sheet
The bottom horizontal framing member
of an opening such
as a window
Single Slope. A sloping roof with one surface. The slope is from one wall to the
opposite wall of rectangular building.
Skylight. A roof accessory to admit light, normally mounted on a curbed, framed
Slippage. Relative lateral movement of adjacent felts (or sheets) in a roof membrane. It
occurs mainly in roofing membranes on a slope, sometimes exposing the lower plies or
even the base sheet to the weather.