A weak layer of cement and aggregate fines on a concrete surface that is usually caused by an overwet mixture, overworking the mixture, improper or excessive finishing or combination thereof.
To join layers of materials together using fusion; the process of joining layers of materials together using adhesion.
That part of a roofing, waterproofing, or flashing component that overlaps or covers any portion of the same or another type of adjacent component.
An asphalt-based roof cement formulated to adhere overlapping plies or asphalt roll roofing.
Occurs where overlapping materials are seamed, sealed or otherwise bonded.
A stable dispersion of polymeric substance in an essentially aqueous medium.
A soft malleable, heavy metal; has low melting point and a high coefficient of thermal expansion.
The sprayed polyurethane foam that results from a pass. It usually is associated with a certain pass thickness and has a bottom layer, center mass and top skin in its makeup.
Application of bituminous cements, adhesives or coatings installed at ambient or slightly elevated temperatures.
A continuous, semi-flexible roof membrane, consisting of multiple plies of felts, mats or fabrics laminated together with alternate layers of roof cements and surfaced with a liquid -applied coating with or without aggregate surfacing.
Temporary loads that the roof structure must be designed to support, as required by governing building codes. Live loads are generally moving and/or dynamic or environmental, (e.g., people, installation equipment, snow, ice or rain, etc.).
A ballasted roofing membrane that is attached to the substrate only at the edges and penetrations through the roof.
The ability of a membrane or other material to resist cracking when flexed after it has been cooled to a low temperature.
A category of roofs that generally include weatherproof membrane types of roof systems installed on slopes at or less than 3:12 (14 degrees).