the ability to resist being worn away by contact with another moving, abrasive surface, such as foot traffic, mechanical equipment, wind-blown particles, etc.
The ability of a material to accept within its body, quantities of gases or liquid, such as moisture
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.
In waterproofing, the use of a strong acid to remove the surface of concrete to expose the aggregate.
A liquid coating system based on an acrylic resin. Generally, a latex-based coating system that cures by air drying.
Polymers of acrylic or methacrylic monomers. Often used as a latex base for coating systems.
A steady or firm attachment.
A material to facilitate independent movement between two units that would otherwise bond together.
Thermal resistance value established by utilizing artificial conditioning procedures for a prescribed time period.
(1) crushed stone, crushed slag or water-worn gravel used for surfacing a built-up roof system; (2) any granular material.
The unintended movement of air from a location where it is intended to be contained to another location
Asphalt produced by blowing air through molten asphalt to raise its softening point and modify other properties.
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.
A metal or material that readily gives up electrons to a cathodic (noble) material. An anodic material will corrode in the presence of moisture when in contact with a cathodic metal. Anodic materials are usually replaceable, and sacrifice themselves in order to preserve the cathodic material.
American National Standards Institute
A hem used in a metal panel seam to reduce the potential for water migration
American Plywood Association
American Plastics Council
see Atactic polypropylene
The average quantity (mass, volume or thickness) of material applied per unit area.
a term used for a flashing located at the juncture of the top of a sloped roof and a vertical wall, chimney or steeper-sloped roof
A metal roof panel, typically a double standing seam or batten seam; usually requires solid decking underneath and relies on slope to shed water.
An asphalt shingle that provides a dimensional appearance.
A raised, flashed assembly, typically a single- or double-wood member attached to a wood base plate, that is anchored to the roof deck. It is used to accommodate thermal stresses in a roof system where an expansion joint is not required, or to separate large roof areas or separate roof systems comprised of different/incompatible materials, and may be used to facilitate installation of tapered insulation.
Design or application techniques peculiar to a specific geographical region
Asphalt Roofing Manufacturers Association
A group of natural, fibrous, impure silicate materials.
American Society of Heating, Refrigerating and Air-Conditioning Engineers
A dark brown or black substance found in a natural state or, more commonly, left as a residue after evaporating or otherwise processing crude oil or petroleum. Asphalt may be further refined to conform to various roofing grade specifications:
a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type I.
a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type II.
a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type III.
Special steep asphalt
a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type IV.
A mixture of asphalt particles and emulsifying agent, such as bentonite clay and water.
A trowelable mixture of solvent-based bitumen, mineral stabilizers, other fibers and/or fillers. Classified by ASTM Standard D 2822-1 Asphalt Roof Cement, and D 4586-2 Asphalt Roof Cement, Asbestos-Free, Types I and II. Type I is sometimes referred to as “plastic cement,” and is made from asphalt characterized as self-sealing, adhesive and ductile, and conforming to ASTM Specification D 312, Type I; Specification D 449, Types I or II; or Specification D 946. Type II is generally referred to as “vertical-grade flashing cement,” and is made from asphalt characterized by a high softening point and relatively low ductility, and conforming to the requirement of ASTM Specification D 312, Types II or III; or Specification D 449, Type III.
A high molecular weight hydrocarbon fraction precipitated from asphalt by a designated solvent (paraffinic naphtha) at a specified temperature and solvent-asphalt ratio
American Society for Testing and Materials
A group of high molecular weight polymers formed by the polymerization of propylene.
The cavity or open space above the ceiling and immediately under the roof deck of a steep-sloped roof.