Underlay Support

Self-supporting underlays in lined roof spaces may be laid unsupported at spans up to 1.2 m. Other underlays must be supported. Underlay support may be safety mesh, hexagonal galvanised wire netting, builders’ tape, or other suitably strong and durable material.

Safety mesh must be designed and installed to comply with the requirements of the AS/NZS 4389:2015

Corroded galvanised safety mesh and wire netting can be damaging to any metal roofing and especially to pre-painted aluminium. Pre-painted aluminium cladding must be protected from contact with potentially corroding steel including netting, staples, or fasteners, See Installing Aluminium