BiForm on Treadtech: A High-End Coastal Deck Built on an Aluminium Subframe System

Project: Paraparaumu, Kapiti Coast 
Main Contractor: The Complete Building Company 
Project Completion: June 2025 
Decking Profile Used: FORM 130 Camo Grey 
Aluminium Subframe Used: TreadTech by UNEX 
Subframe Pedestals Used: TreadJack by UNEX 

For this premium coastal residential project, the goal was simple - create an outdoor space that felt connected to the home, maximised the view, and could perform in a demanding environment.

Behind that vision was a technically complex build.

The deck needed to sit within a fully waterproofed structure, support a floating deck system, and perform in a high-seismic coastal location. TreadTech’s aluminium subframe provided the structural foundation, with BiForm composite decking completing the surface.

The Complete Building Company required a decking solution that could deliver on appearance, durability, and low maintenance - while integrating seamlessly with a highly engineered aluminium subframe system.

As the project evolved, there was an ongoing process of refinement. Board direction, breaker board placement, fixing methods, and overall layout were all carefully considered and adjusted to achieve the right balance between design intent and practical installation.

The final solution needed to not only look exceptional, but work confidently in real-world site conditions.

BiForm worked closely with the builder throughout the project, supporting a collaborative design process from initial layout through to final detailing.
Layouts were developed, tested, and refined through multiple iterations - ensuring the finished deck achieved a clean, well-balanced look that aligned with the home’s architecture.

Product and colour selection also played a key role. Samples and a viewing deck visit helped guide decisions, ensuring the final choice delivered the premium aesthetic the project called for.

Alongside this, BiForm provided technical guidance around fixing methods and compatibility with the TreadTech aluminium subframe - giving the builder confidence that the decking would perform as part of a complete system, not just a standalone product.

The finished deck is a clean, contemporary outdoor space that complements the home’s architecture and takes full advantage of its coastal setting.

BiForm composite decking, paired with the TreadTech aluminium subframe, delivers a complete solution, combining structural integrity with a refined, high-end finish.

The installation process reflected this, with the builder noting they were “really happy with how everything has gone laying the decking.”

This project reflects BiForm’s ability to support both residential and more technically complex builds - combining proven products with hands-on design support and technical confidence.

The result is a deck that looks exceptional, performs in a challenging environment, and delivers the long-term, low-maintenance benefits modern homeowners expect.