CEMP-ET
TI 809-53
01 May 1999
Counterflashing--Formed metal or elastomeric
Coating weight--Weight of coating on surface
sheeting secured on or into a wall, curb, pipe,
(both sides), usually expressed in ounces per
rooftop unit, or other surface, to shield the upper
sq. ft. or grams per sq. meter.
edge of a base flashing and its associated
fasteners.
Coil coating--The application of an organic
finish to a coil of metal using a continuous
Coverage--The surface area to be continuously
process.
covered by a specific quantity of a particular
material.
Cold
flow--Slow
deformation,
under
gravitational force, at or below
room
Covering--The exterior roof and wall covering
temperature. (See Creep)
for a metal building system.
Cold process roofing--A continuous, semi-
Cream Time--This is the time, measured in
flexible membrane consisting of plies of felts,
seconds at a given temperature, when the "A"
mats, or fabrics laminated on a roof with
and "B" components of a polyurethane foam
alternate layers of roof cement and surfaced
compound will begin to expand after being
with a cold-applied coating.
mixed through the spray gun.
Condensation--The conversion of water vapor
Creep--The dimensional change with time of a
or other gas to liquid as the temperature drops
material under load, following the initial
or atmospheric pressure rises. (See also Dew
instantaneous elastic deformation. Creep at
Point)
room temperature is sometimes called cold flow.
Condensation polymerization--Polymerization in
Creep modulus--The ratio of initial applied
which monomers are linked together with the
stress to creep strain.
splitting off of water or other simple molecules.
Creep strain--The total strain, at any given time,
thermal--The
thermal
produced by the applied stress during a creep
transmission in unit time through unit area of a
test.
particular body or assembly having defined
surfaces, when unit average temperature
NOTE: The term creep, as used in this
method,
reflects
current
plastics
difference is established between the surfaces.
engineering usage. Plastics have a wide
C=(W/ m2K) C=(Btu/hft20F).
spectrum of retardation times and the
elastic portions of strain cannot be
Conductivity (Thermal)--The time rate of
separated in practice from nonelastic.
transfer of heat by conduction through a unit
thickness across unit area for unit difference of
Cricket--A relatively small, elevated area of a
temperature.
roof constructed to divert water from a horizontal
intersection of the roof with a chimney, wall,
thermal--The
thermal
expansion joint or other projection.
transmission, by conduction only, in unit time
through unit area between two isothermal
Cross-linking--A general term referring to the
surfaces of an infinite slab of a homogeneous
formation of chemical bonds between polymeric
material of unit thickness, in a direction
chains to yield an insoluble, three dimensional
perpendicular to the surface, when unit
polymeric structure. Cross-linking of rubbers is
temperature difference is established between
vulcanization, qv.
the surfaces. k=(W/mK) k=(Btu/hft20F).
Curb--A raised member used to support roof
Coping--A covering on top of a wall exposed to
penetrations such as skylights, hatches, etc.
the weather, usually sloped to carry off water.
Copolymer--A mixed polymer, the product of
Cure--To change the properties of a polymeric
polymerization of two or more substances at the
system into a more stable, usable condition by
same time.
the use of heat, radiation, or reaction with
D-4
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