The 3 things I learned when I had my foundation repaired that shocked me included: pier spacing is engineering
https://www.tumblr.com/viciouswolfpanda/815865531315945472/residential-foundation-repair-checklist-3-things
The 3 things I learned when I had my foundation repaired that shocked me included: pier spacing is engineering, not guesswork, and fewer deep piers can beat many shallow ones.