Start with conditions, not a product
A crack's width and direction only tell part of the story until someone accounts for Jacksonville's shifting water table -- soil that drains fast in July can sit saturated for weeks after a named storm, and cracks that move with that cycle need a different fix than ones that don't.
Build a complete scope
- What was measured and whether groundwater at this elevation is a factor
- Whether sandy soil has been carried out from beneath a footing or slab
- Whether past storm flooding on the parcel bears on the diagnosis
- The repair proposed and what was ruled out before selecting it
- Access, restoration of finishes and grade, and the warranty in writing
Jacksonville crack-repair context
Flat terrain and a high water table mean a crack repair near Jacksonville that ignores drainage is likely to reopen after the next tropical system rolls through.