Glossary of terms used on this site
There are 44 entries in this glossary.All
| Term | Definition |
|---|---|
| Abrasion Resistance |
The ability to resist being worn away by contact with another moving, abrasive surface, such as foot traffic, mechanical equipment, wind-blown particles, etc. |
| Absorption |
The ability of a material to accept within its body, quantities of gases or liquid, such as moisture. |
| Accelerated Weathering |
The exposure of a specimen to a specified test environment for a specified time with the intent of producing in a shorter time period, effects similar to actual weathering. |
| Acid Etch |
In waterproofing, the use of a strong acid to remove the surface of concrete to expose the aggregate. |
| Acrylic Coating |
A liquid coating system based on an acrylic resin. Generally, a latex-based coating system that cures by air drying. |
| Acrylic Resin |
Polymers of acrylic or methacrylic monomers. Often used as a latex base for coating systems. |
| Active Metal (anodic) |
A metal or material that readily gives up electrons to a cathodic (noble) material. (See anodic). An active metal will corrode in the presence of moisture when in contact with a cathodic metal. |
| Adhesion |
Steady or firm attachment. |
| Adhesive Bond Break |
A material to facilitate independent movement between two units that would otherwise bond together. |
| Aged R-value |
Thermal resistance value established by utilizing artificial conditioning procedures for a prescribed time period. |
| Aggregate |
(1) Crushed stone, crushed slag or water-worn gravel used for surfacing a built-up roof system; (2) Any granular material. |
| Air Leakage |
The unintended movement of air from a location where it is intended to be contained to another location. |
| Alligatoring |
The cracking of the surfacing bitumen on a bituminous roof or coating on a SPF roof, producing a pattern of cracks similar to an alligator's hide; the cracks may not extend completely through the surfacing bitumen or coating. |
| Aluminized Stee |
Sheet steel with a thin aluminum coating bonded to the surface to enhance weathering characteristics. |
| Aluminum |
A nonrusting, malleable metal sometimes used for metal roofing and flashing. |
| Anodic |
A metal or material that readily gives up electrons to a cathodic material in the presence of an electrolyte (see Galvanic series). |
| ANSI |
American National Standards Institute. |
| Anticapillary Hem |
A hem used in a metal panel seam to reduce the potential for water migration. |
| APA |
American Plywood Association |
| APC |
American Plastics Council |
