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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.
Technical category | Type of MultiPole used | Typical pole diameter | Typical pole length | Typical pole spacing | Typical installation method | |
---|---|---|---|---|---|---|
Residential foundations | TC2 & TC3 | UniLog | 275mm for beams and 180mm for jack studs | To suit house dimensions | 1.0–4.0m | 5 tonne excavator |
Commercial foundations | TC1, 2, 3 | UniLog | 275mm for beams and 180mm for jack studs | To suit building dimensions | 1.0–4.0m | 5 tonne excavator |
Road foundations | TC1, 2, 3 | UniLog | 275mm for beams and 180mm for jack studs | To suit building dimensions | 1.0–4.0m | 5 tonne excavator |
Foundation system | Technical Category | Type(s) of MultiPole used | Typical pole diameter | Typical pole length | Typical pole spacing | Typical installation method | |
---|---|---|---|---|---|---|---|
Deep Pile Foundations | Residential foundations | TC2 & TC3 | SED, Uglie, UniLog | 150–250mm | 1.0–22.0m Poles can be joined to reach greater depths | 2.0–4.0m | High frequency vibration and pile driving |
Commercial foundations | TC2 & TC3 | SED, Uglie, UniLog | 250–300mm | 1.0–22.0m Poles can be joined to reach greater depths | 2.0–4.0m | High frequency vibration and pile driving | |
Ground Improvement | Residential foundations | TC2 & TC3 | Uglie | 200–300mm | 2.4–4.8m | 1.0–1.5m | High frequency vibration and pile driving |
Commercial foundations | TC2 & TC3 | Uglie | 300mm | 6.0–15.0m | 1.0–2.5m | High frequency vibration and pile driving | |
Raft Foundations | Residential foundations | TC2 & TC3 | UniLog | 275mm for beams and 180mm for jack studs | To suit house dimensions | 1.0–4.0m | 5 tonne excavator |
Commercial foundations | TC1, 2, 3 | UniLog | 275mm for beams and 180mm for jack studs | To suit building dimensions | 1.0–4.0m | 5 tonne excavator | |
Road foundations | TC1, 2, 3 | UniLog | 275mm for beams and 180mm for jack studs | To suit building dimensions | 1.0–4.0m | 5 tonne excavator |
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CRF01 – Foundations for an existing residential dwelling
CRF02 – Foundations for a new school
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CRF03 – Foundations for a residential dwelling extension
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CRF04 - Foundations for a new residential dwelling
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First of all, we’ll need a geotechnical report for your site. If you don’t have one of these, we’ll help you get one.
This will be based on your geotechnical report, and could involve the customisation of one or more of our existing foundation systems.
Our installation processes are fast and efficient. They’ll have minimal impact on neighbouring properties and will leave your site undamaged.
Issuance of PS3 and PS4 documentation.
You now have excellent foundations to build on!
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