Ventia Platinum Plus Heavy Duty Roof & Wall Underlay 1.5m x 50m (75m²) – NZ
Premium, self-supporting roof and wall underlay offering 7x more breathability than the market leader. Withstands up to 180 days of UV exposure and is BRANZ Appraised for guaranteed New Zealand Building Code compliance. Ideal for residential and commercial roofing projects requiring superior weather protection and durability.
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Product Details
Ventia Platinum Plus Heavy Duty Underlay – 1.5m x 50m (75m²)
The Ventia Platinum Plus underlay is a premium, self-supporting roof and wall underlay engineered to protect New Zealand homes and commercial buildings from demanding weather conditions. Whether you're building a new home, re-roofing an existing property, or working on a large-scale commercial development, this heavy-duty underlay delivers the durability, breathability, and weather resistance that Kiwi builders and roofers demand.
Built for New Zealand's Toughest Conditions
Ventia Platinum Plus is designed to withstand up to 180 days of UV exposure, giving you the confidence and flexibility to manage extended construction timelines without compromising the integrity of your roofing underlay. This is especially valuable on larger projects where weather delays, subcontractor scheduling, or material logistics can push out the time between framing and final roof cladding installation.
Its self-supporting design makes it ideal for low-pitched roofs, reducing the need for additional bracing while maintaining full structural performance across all NZ Wind Zones — from low through to extra high. This means the same underlay can be specified confidently whether you're working on an exposed coastal build in a high wind zone or a sheltered inland development, simplifying material selection across multiple sites.
Manufactured with a micro-porous, water-resistant polypropylene film laminated between two layers of spun-bonded polypropylene, this underlay is engineered to be super strong while remaining exceptionally breathable — offering 7 times more breathability than the current market leader. This advanced construction allows the underlay to absorb up to 200 g/m² of moisture, effectively managing condensation and reducing the risk of mould, timber rot, and corrosion within the roof cavity. For builders, this translates directly into fewer callbacks, longer building lifespan, and better long-term outcomes for homeowners.
Versatile Application Across Your Build
Ventia Platinum Plus isn't just a roof underlay — it's equally suited for wall applications, making it a versatile choice for builders looking to standardise their underlay specification across an entire project rather than sourcing separate products for roof and wall. This can simplify ordering, reduce waste from offcuts, and streamline on-site logistics.
It also performs reliably as a weather-resistive barrier for temporary close-in, giving your build added protection during the construction phase when the structure is most vulnerable to the elements — particularly useful during Auckland and wider New Zealand's unpredictable spring and autumn weather windows.
Its fire-retardant properties add an extra layer of safety, while its bright-white finish ensures a clean, professional appearance — particularly valuable for commercial warehousing, workshops, or any application where an exposed underlay needs to remain visually consistent throughout the life of the building. Roofers consistently note how much easier it is to identify damaged sections or fixing points against the bright-white surface compared to darker underlay products.
Independently Tested and Code-Compliant
Ventia Platinum Plus is BRANZ Appraised (Appraisal No. 1167 [2021]), giving builders, roofers, and homeowners peace of mind that the product meets and exceeds the requirements of the New Zealand Building Code. This independent assessment confirms the underlay's performance in real-world New Zealand conditions, making it a trusted choice for Licensed Building Practitioners and roofing professionals nationwide, and helps ensure smooth sign-off during building inspections.
Product Specifications
- Roll Size: 1.5m x 50m (75m² per roll)
- Weight: 17.50 kg
- Self-supporting for low-pitched roofs
- UV resistance: up to 180 days
- Moisture absorption: 200 g/m²
- Breathability: 7x greater than current market leader
- Suitable for all NZ Wind Zones
- Fire retardant
- Suitable for roof and wall underlay
- Weather-resistive barrier for temporary close-in
- BRANZ Appraisal No. 1167 [2021]
Why Choose Ventia Platinum Plus?
For builders and homeowners across New Zealand who need a heavy-duty, code-compliant underlay that performs under pressure, Ventia Platinum Plus offers the perfect balance of strength, breathability, and weather protection — without breaking the budget. Its versatility across roof and wall applications, combined with independent BRANZ certification, makes it a smart investment for any residential or commercial roofing project, from single-home renovations to multi-unit commercial developments.
Order Today
Ready to secure your Ventia Platinum Plus Heavy Duty 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.
