Deep Pinning – some interesting facts…25 February 2016
- Deep Pinning is a permanent repair which does not lose its effectiveness over time – the root cause of the problem is addressed, as well as the symptoms.
- Most underpinning repairs we undertake are to footings which are well specified – even generous footings are susceptible to significant settlement if the foundation conditions change. No footing can suspend itself above a settled foundation for more than a metre or two before breaking and allowing settlement. Infact, concrete footings need to crack (on the tension side of the footing – typically the top face) before the internal steel reinforcing even starts to help the situation. Often this consolidation, while deemed acceptable by the codes of Standards Australia, is enough for a brick wall to rotate outwards and cause significant cracking and destabilisation.
- Requires far less concrete than alternative underpinning methods, which in doing so, apply additional pressure on the already unreliable soil profile and leave the footing susceptible to further movement should ground conditions keep changing.
- Can be easily customised in the number of load-bearing pins installed and varying ‘angle from vertical’ to suit on-site loading and geological variations, providing an efficient solution every time. Deep Pinning has penetrated through firm clay, swampland and deep sandunes to name a few, many as deep as 22m.
- The process of underpinning over an area produces a defined ‘bedrock depth profile’ which allows any premature refusal on ‘floaters’ or other unreliable strata to be identified as a clear deviation from the norm and structural compensations made. In addition, the softness of the profile at various depths invariably pinpoints the location of the failure layer so that repairs can be made to leaking pipes or drainage issues. This action thereby prevents the problem from spreading to other footings. Logging of the depth where soft layers exist allows upstream cut-off drain depths to be specified so seepage can be intercepted in an attempt to protect the remainder of the property. It provides a full soil profile health assessment.
- Several clients in recent years have had their underpinning FULLY COVERED by their house insurance due to our unique ability to confidently identify the scope of the below-ground issues and the ultimate cause. Deep Pinning not only fixes the problem – guaranteed – it can be virtually free…
- Alternative underpinning systems are often more costly, less effective and include limitations, exclusions and legal disclaimers simply because they stop short of addressing the cause of the failure. Why compromise when a superior solution is available?
The Deep-pinning Advanced Underpinning System was conceived, developed and patented by a Specialist Geotechnical Engineer working in Hobart, Tasmania, Australia and carries a Unconditional Performance Guarantee on bedrock – an industry first.
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