The 3 things I learned when I had my foundation repaired that shocked me: contractors measure with zip levels
https://canvas.instructure.com/eportfolios/4298860/home/what-to-know-before-you-call-3-things-about-residential-foundation-repair
The 3 things I learned when I had my foundation repaired that shocked me: contractors measure with zip levels, data guides lifts, and you should ask for before/after elevation maps.