Delamination

Delamination can occur in several forms on a roof. The most common is paint or coating delamination, where the roof membrane or paint system loses its bond with the tile or metal substrate and begins to peel, flake, or bubble. This typically results from one of three causes: inadequate surface preparation before coating (such as insufficient cleaning or failure to apply a primer), application of the coating in unsuitable conditions (too hot, too cold, or too damp), or the use of an incompatible coating product for the substrate type. Delamination can also refer to the physical separation of layers within a composite roofing material. Fibre cement sheets may delaminate as the cement matrix breaks down with age, particularly in older products that may contain asbestos. Concrete tiles can experience surface delamination when water trapped within the tile body freezes and expands, spalling off the surface layer (a process called frost shattering). In Gippsland, coating delamination is most commonly seen on roofs that have been painted by unqualified operators using inappropriate products or without proper surface preparation. The region's significant temperature range and high rainfall quickly expose any weaknesses in the coating adhesion. Town & Country Roofing uses the Dulux Acratex system, which is specifically designed for Australian roofing conditions and includes substrate-specific primers that ensure reliable long-term adhesion.