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References |
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Glossary
RUBBER A material that is capable of recovering from large
deformations quickly and forcibly, and can be, or already is,
modified to a state in which it is essentially insoluble (but can
swell) in boiling solvent such as benzene, methyl ethyl ketone,
and ethanol-toluene azeotrope.
SADDLE A small structure that helps to channel surface water
to drains. Frequently located in a valley, a saddle is often
constructed like a small hip roof, or like a pyramid with a
diamond-shaped base. (Also CRICKET.)
SATURATED FELT A felt that that has been immersed in hot
asphalt and has absorbed as much asphalt as it can retain
under the processing conditions.
SCRIM A woven, non-woven, or knitted fabric, composed of
continuous strands of material used for reinforcing or
strengthening felts or membranes. Scrim may be incorporated
into the membrane by laminating, coating or extruding.
SCUFFING IN The practice of sealing the edges of a
bituminous cap sheet by applying foot pressure along the lap.
SCUTTLE A hatch that provides access to the roof from the
interior of the building.
SEAM A joint formed by mating together two separate sections
of single ply roofing membrane. Seams may be sealed in a
variety of ways, including hot-air welding, solvent welding and
adhesive bonding.
SEAM STRENGTH The force or stress required to separate
or rupture a seam in the membrane material.
SEAM TAPE Cured or uncured synthetic rubber tape used for
splicing in lieu of "contact adhesives."
SELF-ADHESIVE MEMBRANE Single ply membrane which
can adhere to a substrate and to itself at overlaps without the
use of a field-applied adhesive.
SELVAGE A specially defined edge of a material designed for
some special purpose such as overlapping or seaming.
SHARK FIN An upward-curled felt sidelap or endlap.SHEAR
STRENGTH The stress (pounds [N] or pounds per inch width)
required to disrupt a lap seam or bonded joint or attachment by
forcing the substrates to slide over each other.
SHINGLE (1) A small unit of prepared roofing designed for
installation with similar units in overlapping rows on inclines
normally exceeding 25%; (2) To cover with shingles; (3) To
apply any sheet material in overlapping rows like shingles.
SINGLE PLY ROOFING A roofing system in which the
principal roofing component is a single ply flexible membrane.
SLAG A grayish, porous aggregate left as a residue from blast
furnaces and used as surfacing aggregate.
SLIP SHEET Sheet material, such as reinforced kraft paper,
polyester scrim, or polyethylene sheeting, placed between two
components of a roofing system (such as membrane and
insulation) to ensure that no adhesion occurs between them,
and to prevent possible damage from chemical incompatibility.
SLOPE The angle of incline of a roof surface as measured in
inches per foot (mm/m).
SOFTENING POINT The temperature at which asphalt
becomes soft enough to flow as determined by an arbitrary,
closely defined test method.
SOLID MOPPING See MOPPING.
SOLVENT CLEANERS Heptane, hexane, white gas, and
unleaded gas, used to clean the membrane prior to applying
the splicing adhesive in some single ply roofing systems.
SOLVENT WELDING A process used to chemically weld or
join together two or more layers of certain membrane materials
(usually thermoplastic) by applying a solvent, such as
tetra-hydrofuran (THF), to the overlapping surfaces and mating
them when the bonding surfaces become tacky. Used most
often in welding or sealing seams.
SPLICE See SEAM.
SPLIT A membrane rupture resulting from tensile stress.
SPOT MOPPING See MOPPING.
SPRINKLE MOPPING See MOPPING.
SPUD To remove the roofing aggregate and most of the
bituminous top coating by scraping and chipping.
SQUARE A roof area of 100 ft2 (9.29 m2), or enough material
to cover 100 ft2 (9.29 m2) of substrate.
STEEP ASPHALT A roofing asphalt conforming to the
requirements of ASTM Specification D 312, Type III.
STRAWBERRY A small bubble or blister in the flood coating
of a gravel-surfaced membrane.
STRIP MOPPING See MOPPING.
