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

https://telegra.ph/Before-You-Commit-3-Things-to-Know-About-Foundation-Repair-and-Basement-Waterproofing-05-05

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.