APPENDIX/GLOSSARY
Crack - a flaw consisting of complete or incomplete separation within a single element or between
contiguous elements of constructions.
Crazing - a series of fine cracks that may extend through the body of a layer of sealant or adhesive.
Creep - the deformation of a body with time under constant load.
Cure - to set up or harden by means of a chemical reaction.
Dew-Point Temperature - the temperature at which condensation of water vapor begins for a given
humidity and pressure as the vapor temperature is reduced. The temperature corresponding to
saturation (100 percent relative humidity) for a given absolute humidity at constant pressure.
EIFS (exterior insulation and finish system) - non-load-bearing outdoor wall finish system consisting
of a thermal insulation board, an attachment system, a reinforced base coat, exterior joint sealant,
and a compatible finish.
Elasticity - the ability of a material to return to its original shape after removal of a load.
Elastomer - a macromolecular material that returns rapidly to approximately the initial dimensions
and shape after substantial deformation by a weak stress and release of the stress.
Elastomeric - having the characteristics of an elastomer.
Epoxy - a resin formed by combining epichlorohydrin and bisphenols. Requires a curing agent for
conversion to a plastic-like solid. Has outstanding adhesion and excellent chemical resistance.
Expansion Joint - a discontinuity between two constructed elements or components, allowing for
differential movement (such as expansion) between them without damage.
Extrusion Failure - failure that occurs when a sealant is forced too far out of the joint. The sealant
may be abraded by dirt or folded over by traffic.
Flashing - strips, usually of sheet metal or rubber, used to waterproof the junctions of building
surfaces, such as roof peaks and valleys, and the junction of a roof and chimney.
Gasket - any preformed, deformable device designed to be placed between two adjoining parts to
provide a seal.
Glazing - the installation of glass or other materials in prepared openings.
Gunability - the ability of a sealant to extrude out of a cartridge in a caulking gun.
Heat Transfer - flow of heat energy induced by a temperature difference.
Conduction - heat transfer whereby heat moves through a material; the flow of heat due to
temperature variations within a material.
Convection - heat transfer by movement of a fluid or gas.
Radiation - heat transfer through space by electromagnetic waves emitted due to temperature.
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