Post Tensioning Slabs and Design
We provide specialist post tensioning design and installation for basement slabs, suspended floors, and high-performance structural concrete works.
Our post-tensioning services deliver enhanced structural performance, reduced slab thickness, and improved crack control for demanding basement applications.
Book a Project Consultation
Discuss your basement construction requirements with our specialists.
What Is Post Tensioning
Post tensioning is an advanced concrete reinforcement technique where high-strength steel cables are tensioned after concrete curing to place the concrete in compression. This compressive stress counteracts applied loads and improves structural performance, allowing thinner slabs, longer spans, and enhanced durability compared to conventional reinforced concrete design.
Post tensioned concrete is engineered specifically for each project. High-strength cables are installed in ducts cast into the concrete slab. After concrete reaches design strength, cables are tensioned to precise loads determined by structural analysis. The tensioning force induces compressive stress that optimises slab behaviour under load, reduces concrete cracking, and provides superior performance in basement applications where moisture exposure, long-term durability, and structural reliability are critical.
Key Advantages
- ✓Thinner slab sections reduce excavation depth
- ✓Longer unsupported spans eliminate intermediate columns
- ✓Reduced concrete cracking improves durability
- ✓Superior moisture resistance for basements
- ✓Lower long-term maintenance requirements
- ✓Enhanced structural performance under sustained loads
Post Tensioning Design & Engineering
Structural Analysis & Slab Design
Comprehensive structural analysis to optimise post tensioning design for your project requirements. We determine optimal slab thickness, cable layouts, and tensioning loads to achieve design objectives while managing construction cost and complexity. Analysis includes load paths, support conditions, and construction sequence to ensure structural safety and performance.
Cable Layout & Duct Installation
Precise cable layouts designed to optimise structural performance and constructability. We coordinate duct placement, service penetrations, and mechanical systems to avoid conflicts. Cable routing is verified against structural drawings and confirmed on site before concrete placement to ensure accuracy and quality.
Concrete Placement & Curing
Post tensioning requires precise concrete placement and controlled curing to achieve design strength before cable tensioning. We manage concrete placement, vibration, and curing protocols to ensure uniform concrete quality and adequate strength development. Concrete strength testing confirms readiness for tensioning operations.
Cable Tensioning & Grouting
Cables are tensioned to engineered specifications using certified tensioning equipment and procedures. Each cable is tested and measured to confirm load accuracy. After tensioning, cables are permanently grouted within ducts to prevent corrosion and transfer loads to the concrete slab for permanent load support.
When Post Tensioning Is Beneficial
Multi-Level Basements
Post tensioned slabs reduce thickness and allow longer spans between support columns, creating flexible basement layouts and maximising usable space.
Constrained Excavation Depth
Thinner slabs achieve the same structural capacity with reduced excavation depth, reducing site disturbance and groundwater management complexity.
Long Span Requirements
Basements requiring large open spaces without internal columns benefit from post tensioned slabs capable of spanning greater distances.
High-Performance Durability
Post tensioned concrete delivers superior crack control and moisture resistance, ideal for basements subject to long-term groundwater exposure.
Architectural Flexibility
Thinner slabs reduce structural depth, allowing for greater architectural freedom in basement ceiling heights and service integration.
Reduced Construction Timeline
Optimised slab design and simplified reinforcement layouts can streamline basement construction and reduce on-site coordination complexity.
Our Post Tensioning Expertise
Post tensioning requires specialised engineering knowledge and certified installation procedures. We collaborate with structural engineers to develop optimised post tensioning designs tailored to your basement project requirements. Our team coordinates design, procurement, installation, and commissioning to ensure post tensioned slabs perform as engineered.
Structural analysis and post tensioning design optimisation
Cable layout coordination with architectural and services requirements
Certified installation and quality assurance procedures
Concrete placement and strength monitoring protocols
Cable tensioning and load verification
Grouting and permanent load transfer confirmation
Advanced Post Tensioning for Your Basement Project
Post tensioning offers superior structural performance, durability, and design flexibility for basement projects. Let's discuss whether post tensioning is appropriate for your development and how it can optimise your project outcomes.