Liquid-applied waterproofing

A cold-applied roof waterproofing system in which glass fibre reinforcement, usually chopped strand mat, is laminated in situ with catalysed unsaturated polyester resin over a suitable deck, then finished with a pigmented topcoat. It produces a seamless, rigid covering commonly used on domestic flat roofs, valley gutters and preformed edge trims.

A localised element of a roof or below-ground waterproofing system where the continuous field membrane is interrupted or terminated, such as upstands, penetrations, outlets, movement joints and edges. Details demand specific design and careful workmanship, and they are where most waterproofing failures originate.

Any element that passes through the roof waterproofing, such as soil vent pipes, flues, cables, plant supports and drainage outlets. Each penetration must be individually sealed, typically with upstands, sleeves, preformed collars or liquid-applied detailing, and penetrations are a leading location for leaks.

The surface onto which a coating, membrane, adhesive or covering is applied. In roofing this may be the structural deck, insulation, screed or an existing waterproofing layer; substrate condition, priming and compatibility govern adhesion and long-term performance.