2) Screw or Helical Foundations
Helical posts and earth screws rely on the torque axial relationship between the shaft and thread components of the helical/screw and frictional capacity developed within the soil regime or aggregate downhole. A metal screw ranging anywhere between 4 ft to 7 ft is screwed into the soil. On completion, the screw head acts as the base for Super Structure. Compared to driven piles, earth screws can adapt to a wider range of soil and site conditions. By using predrill pilot holes, we can install earth screws in rocky soils and even bedrock. While drilling pilot holes typically increases the foundation cost compared to driven piles, using earth screws may increase the deployable area. In softer soils, we can install earth screws without pilot holes. However, softer soils require deeper embedment depths.