For more help with this issue, see what sewer line epoxy lining is, slab leak emergencies, our emergency leak detection overview, and how sewer camera inspections work.
Cracked And Collapsed Sections
Under-slab sewer pipe fails from the outside in: soil movement, age, and corrosion crack the pipe until a section collapses and dams the flow. The camera shows the break exactly — how far under the slab it sits and how long the damaged section runs. That footage is what makes the lining plan precise.