The screw piles are driven into the soil until the predetermined load capacity is achieved. They are spaced at pre-determined intervals to share the weight of the structure. When used for foundation repairs, brackets are attached to the base of the walls to transfer the weight to the pile. They are generally installed between ten to thirty feet below the ground level but may be extended deeper if they do not meet the required torque.

The helical pier foundation is preferred over driven piles, drilled shafts, grouted tendons, auger-cast piles, belled piers and other deep foundation systems for a number of compelling reasons. Some of them are listed below.

• Fast installation and immediate loading
• Pre-engineered system
• Eliminates high-mobilization costs associated with driven piles, drilled shafts or auger-cast piles
• Instant torque-to-capacity feedback for production control
• Easily modified in the field
• No need for concrete to cure
• Uses common construction equipment easily fitted with hydraulically-driven torque motors
• Easy to use in limited access sites, high water tables, and weak surface soils
• No need to remove spoils
• No casings are required for flowable sands, soft clay or organic soils
• Minimizes soil disturbance during installation
• Installs in inclement weather
• No vibration
• Environmentally friendly