The 3 things I learned when I had my foundation repaired that shocked me were the difference between helical

https://www.tumblr.com/crispybastioninvader/815822096942956544/residential-foundation-repair-explained-3-steps

The 3 things I learned when I had my foundation repaired that shocked me were the difference between helical and push piers, when each is used, and why depth beats count.