Reline vs Replace
Use the decision guide when the project team is weighing trenchless renewal against full excavation and replacement.
Use the decision guideOpen Trench vs. Slip-Lining for Culvert Projects
Two approaches to culvert repair—dig-and-replace (open trench culvert installation) or insert a plastic culvert liner from the ends (trenchless culvert rehabilitation). This comparison covers cost, timeline, disruption, and long-term performance to help agencies and engineers choose the right method. If open trench replacement is required, the next question becomes which direct burial culvert material to install. For the decision-stage path, pair this comparison with the reline-vs-replace guide.
Side-by-Side: Open Trench Install vs. Culvert Relining
How open trench culvert installation compares to trenchless slip-lining with an HDPE culvert liner across key project factors.
Excavation Required
Open Trench
Full excavation over the pipe—trenching through pavement, fill, and utilities.
Slip-Lining with Culvert Renew®
No excavation over the top. The HDPE culvert liner is inserted from the pipe ends.
Traffic Disruption
Open Trench
Lane closures, detours, and traffic control for the duration of excavation and backfill.
Slip-Lining with Culvert Renew®
Minimal traffic disruption—work is confined to the culvert inlet and outlet areas.
Surface Restoration
Open Trench
Full pavement, embankment, and landscape restoration required after backfill.
Slip-Lining with Culvert Renew®
No surface restoration needed. The existing roadway and embankment remain intact.
Environmental Impact
Open Trench
Disturbs soil, waterways, and vegetation. Often requires environmental permits.
Slip-Lining with Culvert Renew®
Minimal disturbance. Reduced permitting for trenchless culvert rehabilitation projects.
Project Timeline
Open Trench
Longer timelines due to excavation, pipe placement, backfill, compaction, and surface restoration.
Slip-Lining with Culvert Renew®
Faster culvert installation. Cleaning, liner insertion, and grouting can often be completed in days.
Design Life
Open Trench
Depends on replacement pipe material. New CMP may corrode again over time.
Slip-Lining with Culvert Renew®
HDPE culvert liner resists corrosion, abrasion, and chemical attack for long-term culvert repair.
When Each Method Makes Sense
Consider Open Trench
- Host pipe has fully collapsed with no through-path for a liner
- Alignment or grade change is required
- Shallow cover with easy excavation access and low traffic
Consider Trenchless Culvert Rehabilitation
- Deep fill, rail crossing, or high-traffic road overhead
- Environmental sensitivity or costly surface restoration
- Budget and schedule require fast culvert repair with minimal disruption
- Storm drain rehabilitation in urban areas where excavation is impractical
Evaluating open trench vs. slip-lining for your project?
Send us your host pipe details and we'll recommend the best culvert rehabilitation approach.