Expose, replace, test and reinstate
Once the affected section and the wider work area have been assessed, a site-appropriate excavation can provide direct access to the pipe. The damaged section can then be repaired or replaced before the run is tested, backfilled and the surface reinstated as agreed.
Confirm the defect, access and nearby constraints.
Use an appropriate safe excavation system.
Repair or renew the affected pipe section.
Test, backfill and finish the surface as agreed.
Why a dig-out may be discussed
Direct access may be considered when a section is collapsed, severely displaced, unsuitable for an internal repair or affected by site conditions that change the repair route. A symptom alone does not decide the method.
12-second explainer
How a drain dig-out works
Original illustrative animation. The exact method varies with the defect, pipe, access and site conditions.
Read the video transcript
- Locate the defect and assess nearby constraints.
- Expose the affected section with a site-appropriate safe system.
- Repair or replace the pipework, then test the run.
- Backfill and reinstate the surface as agreed.
See the drain-lining alternative and the wider repair assessment route.