Value-Engineered Post-Tensioning That Reduced Reinforcement, Materials and Embodied Carbon
Roomia Storage Oran Park is a $16m new-build, four-storey self-storage facility featuring over 750 storage units, 7,200 m² of net lettable area, and undercover drive-through access for weather-protected loading and unloading. Set to open in 2026.
Project Overview
Project Name: Roomia Storage, Oran Park
Builder: Patterson Building Group
Interspan Engagement: Design & Construct (D&C)
Consulting Engineer: Tonkin
Area: 7,681 m²
Dowel/Sleeve Supply: 262 Sureloks
Concrete Grade: 40 MPa
Software: RAM Concept, RAPT
Design Achievement
Interspan delivered cost savings to the client by proposing an alternative jointing solution for the temporary movement joints. The solution still incorporated Sureloks to allow for slab shrinkage; however, changes to the joint locations and the number of connectors resulted in overall savings.
Engineering & Delivery Highlights
- Tight delivery timelines met
- In-house RAM Concept engineering for accuracy and constructability
- Specialised installation of 262 Surelok dowels
- Post-tensioning efficiency delivered durable, thinner slabs
Why It Matters
This project demonstrates Interspan’s capability to reduce reinforcement, lower embodied carbon, optimise slab design, and deliver fast, predictable outcomes through PT engineering.
Interspan
Interspan uniquely integrates in-house post-tensioning expertise, advanced forensic diagnostics, and cutting-edge strengthening technologies to enable a single-source delivery model trusted by global developers for complex retrofit and reuse projects.
NEW STRUCTURES
The Interspan Group brings unique expertise in post-tensioning, construction methodology, and lifting operations that reduce CO₂ emissions, material usage, and construction program.
EXISTING STRUCTURES
We specialise in helping clients extend the lifespan of concrete structures through advanced repair, strengthening, and carbon-fibre solutions. Adaptive reuse projects are a perfect fit for our expertise, helping to minimise waste while delivering safe, modern outcomes that support community growth.
Over the last decade, the Interspan Group has become a market leader in the application of CFRP-strengthening solutions, with notable projects including the award-winning The Space House in London and the Quay Quarter Tower in Sydney.
Quality Assurance
Quality Assurance holds immense significance for Interspan because it impacts the safety of our operatives and future occupants, the long-term durability of our structures, and our client satisfaction and relationships.
Interspan is accredited under CARES APTO1 for the Production and Supply of Post-tensioning Anchorage Systems and is the only post-tension contractor in Australia accredited under CARES APTO4 for the supply and installation of Post-tensioning systems in concrete structures.
Sustainability
Post-tensioning and adaptive reuse are powerful design approaches that reduce material use and embodied carbon—delivering more efficient, resilient, and sustainable structures for the future.
Australia – NSW
United Kingdom & Ireland
