- Fire retardant — complies with NZBC C/AS2–C/AS6 surface finish requirements for exposed underlays
- Self-supporting — suitable for roof pitches 3° and above without additional netting
- Dual-use — approved for both roof and wall applications in lined buildings
- Highly breathable — high vapour permeability assists moisture management throughout construction and service life
- Weather resistant — provides temporary protection for up to 21 days; same-day cladding coverage recommended
Ventia Iron is a fire retardant, self-supporting synthetic underlay for use on roofs and walls in lined timber and steel framed buildings. Constructed with a microporous water-resistant film between two layers of spun-bonded polypropylene, it provides effective moisture vapour transfer and weather protection during construction.