Plastic pipes are flexible by design and rely on properly compacted side support to stay round. Where bedding was poor or loads exceed design, the pipe squashes; inspection standards flag deformation beyond set percentages as a structural defect.
Significant ovality also rules out some repairs — liners need a bore close to round to seat correctly.
Quantifies deformation in flexible pipes as a structural health measure.
PVC and PE pipes under driveways, poorly compacted trenches and heavy loads.
A CCTV drain inspection is the standard way to confirm whether this is what's happening in your pipes: the camera shows the condition on screen, a locator pinpoints the exact position and depth, and you get a recorded report before any repair decisions are made.
A CCTV drain inspection shows exactly what's happening inside your pipes — no guesswork.