Pipe relining in Pakenham - and when it is the wrong answer.
A new jointless pipe formed inside the old one, cured in place, with a 50-year design life and no trench across your driveway. It is the right fix for most of the old township's earthenware drains. It is also badly oversold, so here is what it genuinely cannot do.
Pakenham's old drains are textbook relining candidates.
Three local factors line up almost perfectly, which is why we do so much of this work in the old township and almost none of it out in the newer Officer and Cardinia Lakes estates.
First, the pipe. Anything built in Pakenham before roughly 1980 is drained in vitrified clay - earthenware - in short lengths with rigid joints. The barrel itself lasts 50 to 100 years and usually still looks fine on camera. The joints do not.
Second, the ground. Cardinia Shire sits on reactive clay, commonly classified H1 or H2 under AS 2870. It swells when wet and shrinks when dry, and our summers push past 40 degrees and dry the profile out hard before winter re-wets it. Rigid joints and ground that moves every year are not compatible; the joints open a millimetre or two.
Third, the trees. The old township has mature gums, willows and liquidambars, and a hairline gap weeping moisture and nutrient into bone-dry February clay is the most attractive thing in the neighbourhood to a root system. It finds it. It always finds it. That combination - rigid joints, moving clay, thirsty trees - is why blocked drains here are so often a structural problem rather than a wet-wipe problem, and why the fix is a liner rather than another visit from an eel. Our guide to blocked main drains covers what the symptoms tell you before we get there.
What actually happens on the day.
- Clear and survey. High-pressure jetting and a mechanical root cutter to get the line clean, then a CCTV camera run end to end with a locator, so we know the diameter, the length, where every junction is, and crucially the condition and the fall. $350 to $750, and you keep the footage.
- Measure and cut the liner. A felt or fibreglass tube, sized to your pipe, cut to length, then saturated with resin. Epoxy or a silicate blend depending on the job.
- Install. The liner is inverted or winched into the host pipe and a calibration bladder inflates it hard against the existing wall, pressing it into every crack and open joint.
- Cure. Ambient, hot water, steam or a UV light train pulled through, depending on the liner system and the length. This is where the tube stops being fabric and becomes structural pipe.
- Reinstate the junctions. The liner seals over your branch connections, so a robotic cutter goes back in and reopens each one precisely. $800 to $1,500 per junction.
- Final camera and handover. A closing CCTV run so you can see the finished bore, plus the compliance paperwork.
Most Pakenham house-to-boundary jobs are a single day, the house stays usable, the driveway stays where it is, and the garden survives.
Four things relining cannot do.
This is the section that gets left off most relining pages, which is precisely why it is on ours.
- It cannot fix a belly or back-fall. The liner follows the host pipe exactly. If your drain sags and holds water now, it will sag and hold water afterwards, because fall is geometry, not pipe condition. A bellied drain wants excavation and a properly re-bedded re-lay. Paying $4,000 to reline a belly buys you the identical blockage next autumn.
- It cannot line a collapse. Relining needs an existing bore to line through. Where a section has fully collapsed there is nothing to line, and that length gets dug. Often the sensible answer is a hybrid: dig the worst two or three metres, line the rest.
- It struggles with severe deformation and big offsets. Badly ovalised pipe, or a joint where one length has dropped away from the next, may not take a liner cleanly. Several tight bends stacked together can also rule it out.
- It cannot protect what you did not line. Line the main run and leave an old earthenware laundry branch untouched, and the roots simply move next door. The survey covers the whole system, and the quote should say plainly which lengths are in scope.
All four of those are decided by the camera, which is why we will not quote relining over the phone. Anyone who does is guessing with your money.
A 1976 township house with a liquidambar.
Standard Pakenham job. Home built 1976, 11 metres of 100mm earthenware from the gully trap to the boundary, running under a concrete driveway, with a mature liquidambar three metres off the line. Toilets backing up every autumn for four years, eeled twice, fine for a season each time.
On camera: roots at three joints, hairline circumferential cracking either side of each, and - importantly - good consistent fall the whole way. That last detail is what makes it a relining job.
The reline. CCTV survey $450. Jet and mechanical root cut $650. Eleven metres of liner at $340 a metre, $3,740. One junction reinstated robotically, $1,100. Call it $5,940, one day, driveway untouched, tree still standing, 50-year design life on the drainage.
The dig. Eleven metres at $700 a metre in that ground is $7,700 before anything is put back. Then saw-cut, remove and re-pour the driveway section: $4,000 to $6,000. The liquidambar's structural roots are through the trench line, so it very likely does not survive, and removal is its own bill. Realistically $13,000 to $15,000, a week of disruption, and a driveway with a patch in it forever.
The reline is obviously right here - but only because the camera showed good fall. Change one detail, put a belly at metre six, and the honest answer flips to digging that section regardless of what it costs. Full ranges are on our 2026 pricing guide, and if you want to know whether your vintage of house is in this category at all, our plumbing lifespan guide spells it out by decade.
Common questions.
What is pipe relining and how long does it last?
A resin-saturated liner pulled or inverted into your existing pipe, inflated against the wall and cured in place - a jointless structural pipe within a pipe, roughly 3 to 6mm wall. Typical 50-year design life, consistent with the CIPP methods in ISO 11296-4 and ASTM F1216, with the finished drainage complying with AS/NZS 3500.2.
Can every drain be relined?
No. It needs an existing bore, so a full collapse must be dug. Severe ovality, big offset joints and several stacked tight bends can rule it out or force a hybrid job. The $350 to $750 CCTV survey is the only thing that answers this, and you keep the footage.
Does relining fix a belly or back-fall?
No, and this is the big one. The liner follows the host pipe exactly - a drain that sags and holds water now will sag and hold water afterwards. Relining fixes cracks, roots, open joints and corroded barrel. It does not fix fall. A belly wants excavation and a properly re-bedded re-lay.
How much versus digging it up?
Relining $250 to $450 a metre, so a typical 8 to 14 metre house-to-boundary run is $2,500 to $6,500, plus survey, jetting and $800 to $1,500 per junction. Digging looks cheaper at $400 to $900 a metre in clear ground - until it goes under a driveway, a crossover, paving or a mature tree, where reinstatement is the actual bill.
Will the roots come back?
Not into a properly lined pipe. Roots do not drill through pipe walls, they exploit joints that have moved - and a cured liner has no joints. The honest caveat: they will find anything you did not line, like an old untouched laundry branch. That is why the survey covers the whole system.
Service areas.
Get the camera down it first.
CCTV survey with footage you keep, and an honest answer on whether relining is right for your drain - or whether it needs digging.