DiamondSteel© Sub-Floor Frame Systems revolutionise foundation construction with ultra-lightweight steel that's one-third the weight of timber yet infinitely more durable. Our prefabricated frames resist moisture, fire, termites, and warping while providing millimetre-perfect level floors for 50 years guaranteed. Transform challenging sites into stable platforms with Australia's most advanced subfloor technology.
The ultimate in functionality with louvre blades allowing 55% airflow (expandable on request). Storm profile louvres available for redirecting water flow while maintaining ventilation to mechanical equipment.
Unlike timber subfloors that can rot, warp or attract termites, our DiamondSteel© systems are completely impervious to moisture damage. The galvanised steel construction ensures your foundation remains stable and strong for decades, regardless of ground moisture or weather conditions.
Every frame features strategically placed, pre-punched service holes with flared edges for safe cable and pipe routing. This eliminates on-site drilling and ensures perfect alignment for electrical, plumbing, and HVAC services from the start.
Prefabricated components arrive ready for assembly, reducing installation time by up to 70% compared to traditional methods. No specialised equipment or hot works required – just bolt together with standard tools for immediate results.
Zero Hot Works Installation

Con-form Group's DiamondSteel© Sub-Floor Frame Systems represent two decades of engineering innovation in lightweight steel construction. Our G550 galvanised steel frames are custom-designed and manufactured at our Bathurst facility, featuring pre-punched service integration and modular components that install without cutting or welding. Perfect for sloping sites, flood-prone areas, or any project requiring absolute dimensional stability, these frames resist all forms of degradation that plague traditional materials. With our 50-year warranty and certification to Australian Standards, DiamondSteel© subfloors deliver unmatched value through reduced installation time, zero maintenance, and the peace of mind that comes from building on truly solid ground.