Drain Replacement (Redrain)
Cast iron and clay drain replacement in-slab and under-slab, done right the first time.
Materials
What we install vs. what corner-cutters use.
Pipe
Schedule 40 PVC with solvent-welded fittings.
Repair-couplings on old cast iron.
Why it matters: Repair couplings buy 2–5 years; full replacement lasts 75+.
Approach
Tunneling from outside where feasible.
Jackhammer through the slab.
Why it matters: Tunneling saves your floors and restoration work.
Testing
Camera inspection and hydrostatic test on every run.
Turn on faucets and watch.
Why it matters: Camera confirms slope and finds any missed defects.
Process
A predictable path — with real durations.
Camera & scope
1 dayVideo-scope every drain, mark issues, pull plumbing permit.
Tunnel or trench
2–5 daysExcavate the affected runs.
Replace
2–3 daysCut out old, install new PVC with proper slope and cleanouts.
Test & inspection
1 dayHydrostatic test, city inspection.
Backfill & restore
1–2 daysBackfill trenches, pour any slab patches, restore landscaping.
Why us
Why homeowners pick Modern Builders for drain replacement (redrain).
We camera every drain line before we quote — that way we know exactly what needs to be replaced and what's still good. No guessing, no scope creep. Where we tunnel from the outside, your slab and flooring never get touched. That saves you weeks of downtime and thousands in restoration. Every new joint gets solvent-welded, hydrostatic pressure-tested, and camera-inspected before we close the trench.
FAQs
Answers before you ask.
How do I know if I need this?+
Slow drains, repeated backups, gurgling toilets, sewage smell, or a camera scope showing cracks or bellies.
Will you have to break my slab?+
Only where tunneling isn't feasible. We minimize slab breakage every time and always call before we cut.
How long does this last?+
Schedule 40 PVC has a 75+ year design life.
Do you handle insurance claims?+
Yes — many redrains are covered by homeowners insurance under sudden-loss provisions. We provide the documentation you need.
Related reading
Go deeper before you decide.
Get a quote — we do it right.
Fixed-price proposals, real timelines, no corners cut. Tell us about your drain replacement (redrain) project.
Request your quote