Glossary

Adhered roof systems: Systems in which the membrane is "glued" to the roof deck using either a solvent- or water-based adhesive.

Built-up roofs: A low-slope roofing system which utilizes hot asphalt and roofing felts, and is constructed on the roof surface rather than in a manufacturing facility.

Calendering: A process of manufacturing vinyl roofing membranes by which vinyl compound is pulled through rollers using heat, resulting in a thin, flexible sheet.

Ballasted roof systems: Systems in which the membrane is secured to the roof system using weight, typically either roofing pavers, blocks or stones.

Extrusion: A process of manufacturing vinyl roofing membranes by which

Fasteners: Threaded screws which are used to install mechanically attached roof systems.

Green roofs: Roofing systems which permit the growth of plants and other vegetation on the roof surface. Vinyl membranes are typically used as a component in green roofs to prevent moisture and root penetration.

Heat sealing: The process of joining membranes using heat.

Mechanically attached roof systems: Systems in which the membrane is attached to the roof deck typically using a screw and metal plate fastener system. Fasteners are then covered and sealed against outside weather.

Reflective roofs: Light-colored roofing membranes (like vinyl) which reflect sunlight and heat away from a building, lowering the surface temperature of the roof and ambient air, often reducing interior air conditioning requirements.

Scrim: The woven reinforcement fabric (typically polyester or fiberglass) used in vinyl roofing membranes.

Spread coating: A process for manufacturing vinyl roofing and waterproofing membranes that utilizes a knife over rolled vinyl plastisol-coated fabric. This method of production also incorporates high temperature to fuse the material into a single, monolithic membrane.

Thermoplastic: A plastic (such as vinyl) which can be formed, fused or changed using heat. This property makes thermoplastics particularly well suited to recycling and enables installation techniques such as heat sealing.