Foundation systems
Raft Foundations
Raft Foundations are designed to be an economic alternative to the TC3 surface structures outlined in MBIE Technical Guidance 2012.
Raft Foundations use MultiPole UniLog beams to form a lattice of strong, lightweight foundation beams. This ‘raft’ is designed to have a four metre internal span and a two metre cantilever at the edge, should your building lose ground support.
We’ll install your raft using a small, 5 tonne digger. There’ll be minimal ground loading and excavation required, with any materials we do excavate being placed back in-between beams and compacted.
If you’re planning on having a concrete slab, we’ll place a working platform of hardfill between the beams. For a timber floor, we’ll fix pre-scalloped UniLog jack studs at the intersections of beams to support timber bearers.
• Installation time frame subject to the size of the poles and the quantity and ground conditions.
• Lightweight – suitable for ground with ultimate bearing capacity of 100kPa or less with specific design.
• Able to be designed for more than 300mm of lateral movement.
• Timber floors are able to be re-levelled following seismic events.
• Concrete floors can be re-levelled using cast-in jacking screws.
• Uses award-winning MultiPoles.
• PS1, PS3 and PS4 provided.
With specific design work sites with exceptionally poor ground conditions, such as SLS Index settlements greater than 200mm, ground with larger than 500mm lateral stretch, or 30kPa ground, can still utilise a Raft Foundation.
Raft Foundations can be combined with additional foundation solutions, such as Ground Improvement or Deep Piles, to provide a site specific foundation solution.