How to Fix a Cracked PVC Pipe Without Replacing It

You can fix a cracked PVC pipe without replacing it, and without digging. Exposed pipe can be patched with epoxy putty, silicone tape or a repair clamp. Buried or in-wall pipe needs relining, which cures a resin liner inside the existing pipe to form a new pipe within the old one.

Start here: can you actually reach the crack?

Everything else follows from this one question.

• Yes, the pipe is exposed. Under a sink, on a garden tap, along a laundry wall. A DIY patch will stop the leak. Skip to the three no-cut methods below.
• No, it is buried or behind a wall. This covers most sewer and stormwater cracks. No patch product will reach it, and the only way to repair it without excavation is relining.

Most cracked PVC that property owners actually deal with sits underground. If you are chasing a smell, a slow drain, a soggy patch of lawn or a backed-up gully, the crack is not somewhere you can wrap tape around.

How to fix a hairline crack in exposed PVC pipe (3 no-cut methods)

These work on accessible pipe. Treat all three as temporary. They stop the leak while you organise the permanent fix.

Method A: Epoxy putty (best for high pressure)

1. Turn off the water at the stop tap and drain the line. Wipe the pipe until it is bone dry. Epoxy will not bond to a wet surface.
2. Sand the area with 80-grit sandpaper, extending about 50mm either side of the crack. You want a dull, scuffed finish, not a shiny one.
3. Cut a slice of two-part plumbing epoxy putty and knead it until the colour is completely uniform, roughly 30 seconds. Streaks mean it has not activated.
4. Press the putty firmly over the crack, extending 25mm past each end and wrapping right around the pipe if you can reach behind it.
5. Wait 60 minutes before turning the water back on.

Method B: Self-fusing silicone tape (best for active drips and joints)

1. Shut off the water and wipe the pipe down. Silicone tape tolerates a slightly damp surface, so this one works when you cannot get things perfectly dry.
2. Start wrapping 50mm before the crack, on clean pipe.
3. Stretch the tape to roughly twice its length as you wrap. The stretch is what makes it fuse to itself. Loose tape will not seal.
4. Overlap each turn by half the tape width and build up at least three layers over the damage.
5. Finish 50mm past the crack and press the tail down hard. It holds pressure straight away.

Method C: Pipe repair clamp (best for splits and emergencies)

1. Measure the outside diameter of the pipe. Most household PVC is 20mm, 25mm or 40mm. The clamp must match.
2. Shut off the water and scrub any dirt or grit off the pipe. Debris under the gasket causes weeping.
3. Centre the rubber gasket directly over the crack.
4. Seat the clamp and tighten the bolts a few turns at a time, alternating sides so the pressure stays even.
5. Restore water slowly and watch the clamp edges for seepage.

Try this now: Wrap a dry paper towel around the suspected crack and leave it for five minutes. It shows you exactly where the fracture starts and stops before you commit to applying epoxy.

Common mistake: Using standard PVC cement on a crack. Cement does not bridge gaps. It works by melting two perfectly fitted pieces together, so applied over a crack it will simply leak.

Why a patch is not a repair

Every method above sits on the outside of the pipe. That matters more than it sounds.

A crack in PVC almost never appears on its own. It is usually a symptom of ground movement, root pressure, a joint that was never glued properly, or two decades of thermal expansion working on the same weak point. Wrapping the outside does nothing about the cause. The pipe keeps moving, the patch keeps taking the load, and the crack keeps travelling under the tape.

Patches also fail quietly. A tape wrap on a buried section can weep for months, softening the soil around the pipe and accelerating the movement that cracked it in the first place. Owners often find out when a section collapses, not when the patch lets go.

That is why the honest answer for anything structural, buried or hidden is relining.

Pipe relining: the permanent fix with no digging

Relining repairs the pipe from the inside. A resin-saturated liner is drawn into the damaged section, inflated against the pipe wall, and cured in place. It bonds to the host pipe and forms a continuous new pipe within the old one. No trench, no cutting, no replacing.

It is the only method on this page that permanently repairs a cracked PVC pipe without replacing it.

What relining fixes that a patch cannot:

• Cracks you cannot reach. Under driveways, slabs, gardens, tiled floors and inside wall cavities.
• Cracks along a run, not just one spot. A liner covers the full length, not a 100mm patch.
• Root intrusion. The cured liner seals the joints and cracks roots enter through, so they have nowhere to get back in.
• Multiple defects at once. Cracks, open joints, minor misalignment and corrosion in the same run are handled in a single pass.

What you get afterwards:

• A structurally stronger pipe. The liner reinforces the host pipe rather than sitting on top of it.
• Better flow. The cured surface is smoother than aged PVC, so debris has less to catch on and drains run faster.
• Root and corrosion resistance built in. The liner is a jointless barrier, and joints are where trouble starts.
• Your property left intact. No excavated lawn, no lifted pavers, no reinstating a driveway afterwards.

Relining is not PVC-specific either. The same process repairs clay, earthenware, cast iron and concrete drains, which matters on older Sydney properties where a single run can change material halfway along.

Comparing your options

Relining is the only row that reaches a buried crack, addresses the cause and leaves your property untouched.

Will PVC glue fix a crack?

No. Standard PVC cement and household glues like Gorilla Glue will not permanently fix a crack. Cement needs tight friction between a pipe and a fitting to weld them, and there is no friction across a split. Super glues and polyurethanes lack the flexibility and waterproof rating that plumbing demands.

If you have already glued it, sand the repair back to bare PVC before applying epoxy putty. Epoxy will not adhere to cured glue residue.

Does Bunnings sell a PVC pipe repair kit?

Yes, for exposed pipe. Bunnings stocks plumbing epoxies, silicone repair tapes and mechanical clamps.

• Epoxy: Selleys Knead It Aqua epoxy putty, in the adhesives and sealants aisle.
• Tape: self-fusing silicone repair tape, in the plumbing aisle.
• Clamps: stainless steel pipe repair clamps, sized to your pipe (usually 20mm, 25mm or 40mm).

Measure your pipe before you go. A 25mm clamp will not close over 40mm pipe.

What you will not find on a hardware shelf is anything that repairs a crack you cannot reach. Relining equipment is specialised and the resin has to be mixed, installed and cured correctly to hold. It is not a DIY product.

How long does a relined pipe last?

A correctly installed liner is designed to outlast the pipe it was installed in, which is why relining is judged against full replacement rather than against a patch. Ask any provider for their warranty in writing before you book.

Signs your cracked pipe is underground

If any of these sound familiar, the crack is not one you can wrap:

• A damp or unusually green patch of lawn that never dries out
• Drains that gurgle or empty slowly across more than one fixture
• A sewage smell outside near a gully or downpipe
• Recurring blockages in the same spot
• Cracked paving or a sunken area above a known pipe run

Talk to Ready Set Reline

We are a family-run relining specialist based in Roseville, repairing cracked PVC, clay, earthenware and cast iron drains across Sydney for homes, strata buildings, commercial properties and councils.

We CCTV the pipe first so you can see the crack before you commit to anything, then reline it without touching your lawn, driveway or floors.

Call 0422 704 670 or request a quote online. We will tell you honestly whether your pipe needs relining or whether something simpler will do.