Cracks in the walls near windows and doorways, or sinking and sloping floors, may be early indicators that you are experiencing problems with your home’s foundations. Underpinning can help to address this building issue, which can occur when soil becomes too wet or dry, affecting the foundation structure. The process of underpinning strengthens a building’s foundations and there are several methods to consider.
Two of the most popular methods include concrete underpinning and resin injection. Both are proven, yet very different, engineering procedures. In this blog post, we explain the difference.
This traditional method has been around for more than 100 years. The basic premise of concrete underpinning is to increase the depth of the foundation to extend it to stonger soil.
It involves digging holes beneath the home or building and pouring concrete into the spaces in accordance with the project specific plan. The concrete is then left to set, essentially creating a new foundation beneath the existing one.
This is a more modern but still proven method of underpinning and strengthening building foundations. It involves injecting environmentally-friendly resin into the foundations through small holes. The resin flows into the soil and expands as it gels, placing pressure on the ground and compressing the surrounding soil. It also fills voids and cracks. As more resin is injected, it will eventually lift the house or structure above.
The process is closely controlled by practised technicians who monitor injection using special precision instruments, usually laser levellers. The resin formula is carefully mixed to suit unique weather and soil conditions.
Learn more about Mainmark’s proprietary Teretek engineered resin solution here.
James O’Grady is a Sales and Business Development Manager at Mainmark. He is a civil engineer with 25 years’ experience in structural engineering, construction materials and ground treatment.