Quantcast Glossary -Cont. - 1001_5a0090

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MIL-HDBK-1001/5A
Strawberry.
Small bubble in flood coat of gravel-surfaced
membrane.
Stripping.  (1) The technique of sealing the joint between base
flashing and membrane plies or between metal and roofing membrane
with one or two plies of felt or fabric and hot- or cold-applied
bitumen.  (2) The technique of taping joints between insulation
boards or deck units.
Styrene-butadiene rubber.  High molecular weight emulsion
polymers, cross-linked to maximize elasticity via
copolymerization of styrene butadiene monomers, used as the
modifying compound in some modified bitumen roofing membranes.
Styrene-butadiene-styrene copolymer (SBS).  High molecular weight
emulsion polymers, with both elastomeric and thermoplastic
properties, formed by the block copolymerization of styrene and
butadiene monomers.  The tri-block copolymer formed has a mid-
block of butadiene with end blocks of styrene in some modified
bitumen single-ply membranes.
Tearoff.  Process of removing an existing roof system down to the
structural deck.
Terne.  Terne metal, prime copper-bearing steel, coated both
sides with terne alloy, 20% tin, 80% lead.  Terne metal is
manufactured in a form of rolls in various widths and can be
formed for standing seam roofs, batten seam roofs, and many types
of flashing.
Thermal conductance (C-factor).  The time rate of heat flow
through unit area of a body induced by a unit temperature
difference between the body surfaces. See thermal resistance.
Thermal conductivity (k-factor).  The time rate of heat flow
through unit thickness of a flat slab of a homogeneous material
in the perpendicular direction to the slab surfaces induced by
unit temperature gradient.
Thermal insulation.  Material used on walls, ceilings, roofs and
floors to retard the passage of heat.
Thermal resistance.  Under steady conditions, the mean
temperature difference between two defined surfaces of material
or construction that induces unit heat flow through unit area.
Note:  Thermal resistance and thermal conductance are
reciprocals. Thermal resistances are R-values; to obtain the U-
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