Ventia Iron Roof & Wall Underlay 2.74m x 36.5m (100m²) | NZ

Ventia Iron – Roof & Wall Underlay 2.74m x 36.5m (100m²)

The Ventia Iron underlay is a premium roof and wall underlay engineered for superior performance and ease of installation, designed to meet the demands of New Zealand's residential and commercial building projects. Whether you're working on a large-scale re-roof, a new build, or a commercial development requiring extensive coverage, Ventia Iron delivers the durability, breathability, and weather resistance that Kiwi builders and roofers rely on.

Engineered for Superior Performance

Ventia Iron is built to withstand up to 90 days of UV exposure, giving builders a practical window to manage construction timelines without compromising the underlay's protective performance. While this UV rating is tailored for standard project schedules, it reflects the product's focus on high breathability and tear resistance rather than extended exposure — making it a smart, cost-effective choice for projects with well-planned installation timelines.

One of the standout features of Ventia Iron is its exceptional breathability — independent lab testing shows it performs 10 times more breathably than competing underlay products. This superior breathability plays a critical role in moisture management within the roof and wall cavity, helping to reduce condensation buildup and protecting the structure from mould, timber rot, and corrosion over the life of the building.

Ventia Iron also features high tear resistance, ensuring the underlay can withstand the rigours of on-site handling, fixing, and adverse weather conditions during installation — reducing the risk of damage and the need for costly repairs or replacement rolls.

Built for All Wind Zones

Suitable for all New Zealand wind zones, Ventia Iron delivers extra high wind zone performance when used as an overlay for rigid wall underlays — making it a versatile option for builders working across a range of site conditions, from sheltered suburban builds to exposed, high-wind coastal locations. Its fire-retardant properties add a further layer of safety and compliance, giving builders and homeowners confidence that the product meets essential building performance standards.

Wider Roll for Faster, Easier Installation

A key advantage of this variant is its heavier-duty 2.74m roll width — significantly wider than standard underlay rolls. This wider format makes installation noticeably easier in windy conditions, as fewer rows are needed to cover the same roof or wall area, reducing the amount of time the material is exposed and handled on-site. Fewer overlaps and joins also mean faster application, which translates directly into reduced labour time and lower overall installation costs compared to narrower alternative products on the market. For roofing contractors managing tight project timelines, this efficiency gain can make a meaningful difference across multiple jobs.

Versatile Application

Beyond its use as a primary roof underlay, Ventia Iron performs equally well as a wall underlay, allowing builders to standardise their underlay specification across an entire project. This flexibility simplifies material ordering, reduces on-site waste, and ensures consistent performance across every part of the building envelope.

Product Specifications

• Roll Size: 2.74m x 36.5m (100m² per roll)
• Weight: 13.00 kg
• UV resistance: up to 90 days
• Breathability: 10x greater than competitors (independent lab tested)
• High tear resistance
• Suitable for all wind zones (extra high performance as overlay for rigid wall underlays)
• Fire retardant
• Suitable for roof and wall underlay applications
• Wider 2.74m roll width for faster, easier installation

Why Choose Ventia Iron?

For roofing professionals and builders across New Zealand looking to reduce installation time without compromising on performance, the Ventia Iron underlay offers an excellent balance of breathability, tear resistance, and wind zone versatility. Its wider roll format is a genuine time-saver on larger projects, helping crews work more efficiently in challenging weather while keeping overall project costs down.

Order Today

Ready to secure your Ventia Iron Roof & Wall Underlay? Feel free to place your order by emailing us at [email protected] or calling us at 0221969021 — our team would love to hear from you and help you get the right materials for your next project.