When the soil your home is built on can no longer support the weight of your home, the structure will start to settle. An expert may recommend installing a deep foundation system to stabilize your home.
Deep foundation soils and deep foundation systems are best understood by starting with the ground. Soil is made up of obvious layers which have different qualities and are a good indicator of how deep you need to extend your foundation.
The top layers of soil compress and easily compact – this is where settlement occurs and where you’ll find problem soils like expansive clay. The deeper soil layers, like parent rock, are stable and less likely to move. This is why a deep foundation pier system is installed into competent load bearing soils or bedrock.