We machine drill holes 12 inches in diameter about 6 to 10 feet deep. Then we dig about 30 to 36 inches around the top (see attached drawing). Then we pour concrete up to about 10 inches below the footing. The only consistent soil layer in Louisiana is the top 5 to 10 feet in depth. Because our piers are conically shaped we take advantage of the harder, dryer soil layer. We also go deep enough to penetrate below the moveable soil layer without hitting the softer , wetter soils below.
Over the last 24 years we've only had to readjust about 3 out of every 100 piers that we've installed. We've had the full support of the engineering professionals who specialize in solving foundation problems in our community. In fact every engineer in Louisiana that we've worked with or consulted has preferred our system for foundation repair in this state.