Most foundations installed by Advanced Development Services, Inc. utilize the tube-style design patented by Patrick and Henderson, Inc. 

Due to its tensionless feature and low cost, of the major designs available today, P&H designs have become the prefered foundation type.  

For more information on P&H foundation systems, please refer to our page entitled "Structural Engineering."

For soil conditions less than ideal for a P&H design system, alternative foundation types are available.  These may include:

Gravity Foundation.

The gravity foundation, shaped like an upside-down mushroom, is designed to be installed in poorly consolidated soils.  The foundation system has the effect of holding the wind turbine upright through sheer weight and leverage.   The design is used widely, but requires the most concrete to build, and thus may not be the most cost effective.

Rock-Anchored Foundation.

If a wind turbine is sited on solid, non-fracturing rock, a series of anchors can be drilled into the base stone and then tied to a foundation cap on the surface. This “rock-anchored” type of foundation is less expensive to build than a gravity foundation, but can only be used where the rock formations are close to the surface and their geological structure will hold anchors securely over time.