Term Description
Coated felt (sheet)

(1) An asphalt felt that has been coated on both sides with harder, more viscous asphalt; (2) a fiberglass felt that has been simultaneously impregnated and coated with asphalt on both sides.
Coating

(1) A layer of liquid material applied to a surface for protection or appearance; (2) A fluid material applied in the field as a film to the roof surface to provide weather protection to the original roof substrate; (3) a factory- or field-applied protective or decorative layer bonded to its substrate such as a metallic coating deposited mechanically, by hot dipping or electroplating, or a cured paint system application on sheet metal or building surface, or anodized finish on aluminum.
Code

A collection of laws (regulations, ordinances or statutory requirements) adopted by an authority having jurisdiction. See "building code and ‚"model (building) code.‚"

Coefficient of thermal expansion

The coefficient of change in dimension of a material per unit of dimension per degree change in temperature.
Coil coating

The application of a finish to a coil of metal using a continuous mechanical coating process.

Cold forming

The process of shaping metal into desired profiles without the application of heat.
Cold joint

A joint formed when a concrete surface hardens before the next batch of concrete is placed against it; characterized by a poor bond unless special procedures are observed.
Cold rolled

The process of forming steel into sheets, panels or shapes on a series of rollers at room temperature.
Cold-applied

Designed for or capable of being applied without heating as contrasted to hot-applied. Cold-applied materials are furnished in liquid state, typically through the use of a liquid carrier; hot-applied materials are furnished as solids that must be heated to liquefy before application.
Collar

A metal cap flashing around a vent pipe projecting above a roof deck.
Color retention

The measurement of performance for paint systems testing the ability to resist fading.
Color stability

The ability of a material to retain its original color after exposure to weather.
Column

In structures, a relatively long, slender structural compression member such as a post, pillar or strut; usually vertical with the compression load acting in (or near) the direction of its longitudinal axis.
Combing ridge

A term used to describe an installation of finishing slate shingles or wood roofing at the ridge of a roof whereby the shingles on one side project beyond to the apex of the ridge.
Combustible

Capable of burning.
Combustion

An act or instance of burning.
Compatible materials

Two or more substances that can be mixed, blended or attached without separating, reacting or affecting the materials adversely.
Composite board roof insulation

Rigid board insulation generally composed of perlite, wood fiberboard, oriented strand board or plywood factory-bonded to polyisocyanurate or polystyrene.
Compound

In polymer processing and applications, an intimate admixture of polymer(s) with all the materials necessary for the properties required of the finished product.
Compounded thermoplastics

A category of roof membranes made by blending thermoplastic resins with plasticizers, various modifiers, stabilizers, flame retardants, ultraviolet absorbers, fungicides and other proprietary substances alloyed with proprietary organic polymers.
Compression

(1) Subjecting a material to a load that will tend to compress or push the material together; (2) a decrease in length produced on a test specimen during a creep test.
Compressive strength

The property of a material that relates to its ability to resist compression loads.
Concealed plate

See "splice plate."
Condensate

The liquid resulting from the condensation of a gas.
Condensation

The conversion of water vapor or other gas to liquid phase as the temperature drops or atmospheric pressure rises; the act or process of condensing. See "dew point."

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