| Saturated Felt |
a felt that has
been partially saturated with low softening point
bitumen.
|
| SBS |
See Styrene Butadiene Styrene |
| Screen |
an apparatus with apertures for
separating sizes of material. |
| Seal |
(1) a narrow closure strip made
of bituminous materials; (2) to secure a roof from
the entry of moisture. |
| Sealant |
a mixture of polymers, fillers,
and pigments used to fill and seal joints where moderate
movement is expected; it cures to a resilient solid. |
| Self -Adhering Membrane |
a membrane that can adhere to
a substrate and to itself without use of adhesives.
The undersurface is protected by a release paper. |
| Selvage |
an edge or edging that differs
from the main part of (1) a fabric, or (2) granule-surfaced
roll roofing material. |
| Selvage Joint |
a lapped joint designed form
mineral surfaced cap sheets. The mineral surfacing
is omitted over a small portion of the longitudinal
edge of the sheet below in order to obtain better adhesion
of the lapped cap sheet surface with the bituminous
adhesive. |
| Shark Fin |
an upward curled felt side or
lap or end lap. |
| Shingle |
(1) a small unit of prepared
roofing material designed to be installed with similar
units in overlapping rows on inclines normally exceeding
25 percent; (2) to cover with shingles; (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 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. |
| Sieve |
an apparatus with apertures for
separating sizes of material. |
| Slag |
a hard, air-cooled aggregate
that is left as residue from blast furnaces. It is
used as a surfacing aggregate and should be surface
dry and free of sand, clay, or other foreign substances
at the time of application. |
| Slip Sheet |
a sheet material placed between
two components of a roof assembly to ensure that no
adhesion occurs between them, and/or to prevent possible
damage from chemical incompatibility, wearing or abrasion
of the membrane. Often associated with PVC membranes. |
| Slippage |
the relative lateral movement
of adjacent components of a built up roof membrane.
It occurs mainly in roof membranes on a slope, sometimes
exposing the lower plies to the weather. |
| Slope |
the tangent of the angle between
the roof surface and the horizontal. It is measured
in inches per foot. The Asphalt Roofing Manufacturers
Association (ARMA) ranks slopes as follows:
- Level Slope: up to 1/2 inch
per foot
- Low Slope: 1/2 inch per foot
to 1 1/2 inches per foot
- Steep Slope: over 1 1/2 inches
per foot
|
| Smooth Surfaced Roof |
a built up roof membrane surfaced
with a layer of hot mopped asphalt, cold applied asphalt
clay emulsion, cold applied asphalt cutback, or sometimes
with an unmopped inorganic felt. |
| Snow Load |
a load imposed on buildings due
to snowfall. (Categorized as live or environmental
load.) |
| Softening Point Drift |
a change in the softening point
of bitumen during storage or application. (See Dropback) |
| Soil Stack |
a sanitation pipe that penetrates
the roof - used to vent plumbing fixtures. (Stink Stacks) |
| Solid Mopping |
see Mopping |
| Solvent Welding |
a process where a liquid solvent
is used to chemically weld or join together two or
more layers of certain membranes (usually thermoplastics). |
| Spot Mopping |
see Mopping |
| Sprayed Polyurethane Foam (SPF) |
a foamed plastic material, formed
by spraying two components, PMDI ([A] component) and
a resin ([B] component) to form a rigid, fully adhered,
water resistant, and insulating membrane. |
| Sprinkle Mopping |
see Mopping |
| Square |
the term used to describe 100
square feet of roof area. |
| Stack Vent |
a vertical outlet in a built
up roof system designed to relieve any pressure exerted
by moisture vapor between the roof membrane and the
vapor retarder or deck. |
| Standing Seam |
a metal roof system that consists
of an overlapping or interlocking seam that occurs
at an upturned rib. |
| Steep Asphalt |
a roofing asphalt that has a
softening point of approximately 190F (88C) and that
conforms to the requirements of ASTM Standard D 312,
Type III. |
| Strawberry |
a small bubble or blister in
the flood coating of gravel surfaced roof membrane. |
| Stress Crack |
external or internal cracks within
a material caused by long-term stress. |
| Strip Mopping |
see Mopping |
| Stripping |
(1) the technique of sealing
a joint between metal and Strip Flashing the built
up roof membrane with one or two plies of felt and
hot applied or cold applied bitumen; (2) the technique
of taping joints between insulation boards on deck
panels. |
| Styrene Butadiene, Styrene Copolymer
(SBS) |
high molecular weight polymers
that have both thermoset and thermoplastic properties
formed by the block copolymeriztion of styrene and
butadiene monomers. These polymers are used as the
modifying compound in SBS polymer modified roofing
membranes to impart rubber like qualities to the asphalt. |
| Substrate |
the surface upon which the roofing
or waterproofing membrane is applies (i.e. the structural
deck or insulation). |
| Superimposed Loads |
loads that are added to existing
loads. For example, a large stack of insulation boards
placed on top of a structural steel deck. |
