Dover Heights Drain Clearing Specialists

Blocked Drains Dover Heights

Dover Heights is constructed around 220-million-year-old sandstone that has been slowly cracking and moving since the time when the suburb was built. The sewers below these cliff-top houses must contend with excessive slopes, ground vibrations, corroded pipes with salt, roots of fig trees that make every pipe connection a drinking-fountain. When anything gets in the way here we are aware of the ground, literally.

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📹 CCTV Drain Inspection
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Drains on a Cliff: It Makes Draining More Difficult than Flat Suburb

Dover Heights is located on a single square kilometre area of cliff-top land located along the eastern coast of Sydney with a height of up to 89 metres above sea level. The suburb is located on the Hawkesbury Sandstone, which is a rock formation of the Triassic age that was deposited by the ancient rivers about 200 to 220 million years ago. The sandstone is grand to construct on because of the views, but poses certain challenges to all that lies under those houses.

Sandstone is brittle and hard and is likely to be divided by vertical jointing which are cracks that separate the rock into large blocks. These joints enable water to infiltrate, the softer strata to be washed away, and the ground to move in a manner that the soils formed of clay do not. In sewer and stormwater piping that is installed on steeper slopes over this ground, that movement is converted into joints that have been displaced, broken, and pipes that have lost original position. The sewer line that was installed at an exact fall fifty or sixty years ago might not be able to take the garbage at the rate at which it was made, as the ground beneath it has moved by millimetres.

Above the geology, Dover Heights has a direct view into the Pacific Ocean. Air that is contaminated with salt corrodes exposed metal fittings and increases the corrosion of galvanised and cast iron drain fittings. The trees and coastal figs and Norfolk Island pines and native banksias make up the suburb, pushing their aggressive root systems into the sandy, permeable soil that covers the sandstone, in search of moisture provided by the closest available source. The warm and nutrient-laden contents of sewer lines are overwhelmingly tempting.

All this is under houses worth in the millions of dollars, gardens with retaining walls and tiered levels, and outdoor entertainment spots, which would be ruined by excavation work. The issue of drains in Dover Heights is both geological, environmental and architectural simultaneously when the drains are blocked. We know that, and we do each job as such.

Services that we offer

  • ✓ Clogging of sewer drains.
  • ✓ Kitchen, bathroom and laundry drains.
  • ✓ Blocked toilet repairs.
  • ✓ Clearing of stormwater and sub-surface drain.
  • ✓ Removal of tree roots in sewer pipes.
  • ✓ CCTV camera checks on drain.
  • ✓ Water jet blasting at high pressure.
  • ✓ No-dig repair (pipe relining).
  • ✓ Drain excavation and replacements of pipes.
  • ✓ Retaining wall and sub-floor drainage.

What Blocks Dover Heights Drains?

These reasons are not similar to flat suburban streets. The geology, gradient, salt, and aggressive root species all interact in a manner that is unique to this cliff-top suburb.

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Figs and Norfolk Pines

The canopy of mature trees in Dover Heights has some of the most aggressive root-spreading species in Australia. The Port Jackson figs and Moreton Bay figs produce lateral roots 20 to 30 metres below the trunk. With roots that spread deep into neighbouring residential areas, Norfolk Island pines are prevalent on the coastal reserves. These roots grow swiftly and deep and far in the loose, porous earth which covers the sandrock of Dover Heights, and which detects every weak point in a terracotta or earthenware sewer line.

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Sandstone Ground Movement

Hawkesbury Sandstone tends to be vertical jointing which are natural cracks that separate the rock into big blocks. At a cliff-top location where the escarpment is gradually being eroded by sea action, the jointing permits minor ground motions over centuries. The sewer lines are laid on strict grades over steep blocks of Dover Heights which do not remain in the same position. Joints open. Parts slide out of step. And a pipe that was in perfect operation when it was installed in the 1960s now has a sag point where the waste collects rather than flows through.

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Drains Losing Grade due to Gravity

The sewage systems are based on gravity. The distance between the house and boundary is gradual and regular in a flat suburb. At Dover Heights, where houses have been constructed on terrains that go down sharply on the street front towards the cliff, sewer lines are laid on steeper slopes, and are more prone to any movement in their orientation. A pipe that has lost so little of its original grade that a low spot has been formed where the waste gathers, and the rubbish collects and the blockage increases month after month till the drain is blocked.

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Oil and Grease in Family Kitchen

Dover Heights is a family suburb, the average age is 10-19, that is, there are large household groups that cook. These homes have kitchen drains that receive cooking oil, food residues and detergent on a daily basis. Grease in a multi-story house where the kitchen may be two or three stories higher than the sewer line exit point has a distance of a long time to coat the pipes before it gets to the boundary. That coating decreases the bore each month until the drain is choked.

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Fittings Salt Corrosion

Dover Heights has no harbour buffer. Wind full of salt blows straight into all open drain fittings, grates and inspection holes. Galvanised steel grates rust. Plugging cleanout of cast iron. The threads on brass fittings corrode. Once an inspection point or cleanout has corroded closed, it becomes far more difficult to access the drain and provide maintenance or clearance, and in some cases it can be difficult to even reach the blockage because the fitting may have to be cut out and replaced.

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Old Pipes Meeting New Extensions

A large number of Dover Heights houses have been renovated or extended, several times. In every renovation, new PVC drainage might have been linked with the already existing terracotta or earthenware pipes with the help of rubber adaptors. These connection points are necessarily weak as compared to a continuous run of a pipe. With time the rubber wears, the joint loosens and the roots or soil get into the system at exactly the point of the old and the new. It is one of the most prevalent failure points that we have discovered when we camera a Dover Heights sewer line.

Six Signs that a Drain is Clogged

In a house where water damage is up to high-specification finishes, it is not only about convenience, but also about saving your investment.

1

Several Fixtures Filtrating slowly

When the kitchen, shower and basin are slow simultaneously, the obstruction is in the main sewer line, rather than at a single source. The bigger the problem is rooted the more fixtures it affects.

2

Gurgling Between Drains

Flush the toilet and the shower drain bubbles. Turn on the dishwasher and the sink in the kitchen sinks. Air that is behind a partial blockage will push through the closest water seal. It is a good early warning.

3

Bad Smell of Drains or Garden

The waste that lies in a partially blocked pipe decomposes and forms hydrogen sulphide gas. When you can smell it outside at a grate, or inside the house at the drain, or out in the garden where the sewer line runs, something is blocked up down there.

4

Retaining Wall or Terrace Damp Patch

In a tiered property at Dover Heights, the sewer line may be broken behind or under a retaining wall, which may seep water into the house. When a wet area is seen on a retaining wall, which does not dry up after a rain, it is worth inspecting, as it can be a sign of a blocked drain in the wall.

5

A Fixture Back of Another

You turn on the toilet, and water sprays in the shower. The laundry floor waste has the washing machine drains and the water is seen in the floor. Mutually affecting fixtures have an obstructed drain line. This in itself becomes an overflow of sewage.

6

Abnormally Green Patch on a Terraced Garden

An underground sewer demolished or burst will serve as a slow-release fertiliser. A single place on a terraced garden level which is greener and lushier than the rest, especially in the probable sewer direction down the house to the limit, points to a damaged pipe beneath.

How We Unclog and Seal the pipes in Dover Heights

📹 CCTV Drain Inspection

Diagnostic

We put a camera down the pipe before clearing anything. The camera in Dover Heights, where sewer lines are laid on steep grades through sandstone formations and which might have been altered in the renovation process, lets us know just what we have dealt with, roots, grease, a displaced portion, a failed rubber adaptor or a collapsed pipe. We capture the video and send it to you. In the case of multi-level houses where the sewer passes through or behind retaining walls, we are able to pinpoint the location of the problem using the camera this way we do not have to guess.

💦 High-Pressure Jet Blasting

Clearing

High pressure water jet cuts through root masses, grease deposits and debris. Jetting is especially useful in steep-grade sewer lines in the town of Dover Heights since gravity helps the material being cleared to move out of the pipe. Jetting can be used to restore full flow on most blockages, root intrusion, grease, and general buildup, on the same visit. Then we do the second camera pass to ensure that the line is clear, and the state of the pipes after the cleaning process.

🔧 Pipe Relining (No-Dig Repair)

Permanent Fix

In cases where the camera reveals broken joints, root entry points or moved portions, relining can be a most appropriate long-term repair of Dover Heights structures. An inner liner, in the form of a resin, is placed and cured within it, forming a new seamless pipe within the existing one. There is no joints, there is no future root entry. There will be no excavation, no digging in landscaped gardens, tiered terraces, or driveways cut out of the cliff. Relining saves the above ground portions and is used to repair the under-ground portions in a suburb where the outdoor spaces are built and landscaped to a high standard and placed on top of costly retaining structures. Pipes that are relined come with 35-year or greater warranties.

⛏️ Excavation and Replacement

When Necessary

When a pipe has completely broken down, or has displaced greatly down the sandstone, or has broken at several points on a short run, the broken part must be removed. In the steep blocks of Dover Heights, excavation must be planned, shored, accessed at the right level, the retaining walls must be safeguarded and the surface restored after the excavation. We do not propose excavation unless relining is not an option, however, when the pipe is truly irreparable the only way ahead is to replace it properly with modern PVC on a properly engineered grade.

The Geology under your house: 220 million Years of Sandstone

Dover Heights is located on the Hawkesbury Sandstone, which is a rock surface deposited by the braided rivers over a period of 200-220 million years in the Triassic period. It is about 200 metres thick and made of layers of quartz sand, some of dramatic cross-bedding, and others so vast and uniform as to be massive. In between the sandstones are thinner mudstone units, which are softer rock and erode easily.

In places where there is softer mudstone under harder sandstone, undercutting takes place. The erosion of marine water gradually washes away the mudstone of the lower of the cliffs, and leaves the sandstone on the top of it without support. This process is observable in the dramatic cliff faces of Diamond bay and along the coastal reserves, but also results in minor movement of the ground further back from the cliff edge. The foundations and underground infrastructure of the properties located in the wider geological influence zone of the escarpment can change gradually in decades.

In the case of sewer and stormwater pipes, it is expressed in gradual dislocation at joints. A 1960s terracotta sewer line installed in a steep block in Dover Heights could have moved by millimetres at each joint in sixty years. That suffices to leave openings that will admit roots, permit the soil to infiltrate, and alter the effective gradient of the pipe. A recurring blockage in Dover Heights, which camera reveals, the joint out of place, is often the tale of the underlying geology.

No-Dig Repair in a Suburb Where the Garden is as expensive as the Repair

The Dover Heights houses lack small backyards. They have outdoor rooms landscaped, levels of entertainment, selected mature plantings as done by the landscape architects, and hardscaped surfaces which blend with retaining walls designed into the cliff. One of these properties has a sewer line that may pass under a sandstone patio, under a garden terrace that is held by a structural wall and under a driveway that was poured to a precise finish. Digging through any of it to replace a section of a pipe is disruptive, costly and in some cases structurally hazardous.

Pipe relining was basically created in a scenario such as this. The damaged section is then inflated and cured in place, the liner is inserted through an existing access point, typically a cleanout or a boundary tap, and forced through the pipe to the damaged area. There is nothing on the ground that is disturbed. The garden remains unchanged. The retaining wall remains in place. The driveway remains in place. And the pipe below is now seamlessly, root-proof, corrosion-resistant, which is even stronger than the original terracotta that was replaced.

To the people of Dover Heights, relining is not only a convenience but in most cases it is the only viable solution that does not involve an engineering inspection, a landscape re-creation and a bill that is almost as big as the blockage itself. Most standard relining is done in a single visit, with a camera inspection first to ensure the pipe is a viable candidate followed by a quote and finishing the work.

The operation of a Drain Call-Out in Dover Heights

1
Call and Describe

Report the situation, sluggish drains, sewage bursting, odor, and flooding in the backyard. We will inquire about your property plan and plan to visit at a certain time.

2
Going In Camera First

A CCTV camera is sent down the line to locate the blockage, determine the condition of the pipes, and determine any structural movement. You watch the video with us.

3
Clear the Blockage

We restore flow with jet blasting, mechanical clearing or a combination of both. You have a good price prior to work commencement. With a second camera pass we confirm.

4
Report and Advise

In case of structural damage, we discuss alternatives, relining, or excavation, and the alternatives are well priced. When all that was required was to clear the drain, we provide useful advice on how to prevent the drain based on your property.

Testimonials of our Customers

★★★★★

"Our drain in the back yard was filling up and Plumber Sydney arrived and quickly determined the problem and got it cleared away, and the area was clean and he advised us on how to prevent it happening again."

Eastern Suburbs Customer — Verified
★★★★★

Testimonial: "Quick and efficient service offered. I made a call as an enquiry call-out, and was attended to within two days, services were reasonably priced, highly recommend to use it in your plumbing problems.

Frances C. — Sydney
★★★★★

"Very fast Callout, excellent service, highly recommended, thank you again."

Debbie R. — Sydney

Frequently Asked Questions For Blocked Drains Services

The majority of blockages are cleared during the visit. Our arrival time is two hours and we tend to be there earlier. Dover Heights lies between North Bondi and Vaucluse 9 kilometres south of the CBD. We are familiar with the steep streets and property access of the suburb. The clearance of a typical blockage is less than an hour when we are certain of the cause using the camera.

No. We charge a fee of $0 when we call out in any of the areas that we serve. Efficiently, you are presented with a clear quote when we have inspected the drain on-site. Nothing begins until you have assented.

Repeated blockages in the same place are nearly always due to structural damage of the pipes, a displaced joint, a crack, a failed adaptor between old and new pipe, or a part of the pipe that has lost its original gradient by movement of the ground on the sandstone. The symptom is relieved every time with jetting, but the roots or debris come back due to the entry point remaining open. The footage of the CCTV after clearing reveals what is happening. The damage is permanently sealed by relining.

Yes. The process of relining is suitable with steep-grade sewer lines provided the pipe has not collapsed completely or moved so much out of alignment that the liner cannot fit through. This flexing of the liner in fact allows it to tolerate smaller misalignment hence it is more forgiving than rigid PVC replacement in terrain that still happens to move slightly. To establish suitability, we always first take a picture and verify it.

Absolutely. The sewer lines of many houses in Dover Heights extend through many levels, including the house, terraced gardens and retaining structures to the boundary. We gain entry to the system at the most convenient location, usually a cleanout fitting at the lower level of the property. In the case of steep blocks with the boundary trap at a different level than the house we prepare to access the house beforehand so we do not waste time on-site with the drain blocked. Q: Is the Waverley Council tree policy in regard to root damage to my drains? A: Waverley Council has Drain Blockage Guideline which specifies in what circumstances the council can assume responsibility of the blockage of drains due to trees owned by the council. In case a tree on council land, a street tree or a tree in a public reserve, has roots in your sewer or stormwater pipes, you can request council assistance. However, you need to maintain your sewer pipes and have a sewer service diagram. We can offer footage on CCTV and document of the root intrusion which will be a great piece of evidence in case you have to file a claim with Waverley Council.

No. Chemical cleaners are not only corrosive to old pipe joints, but also destroy rubber adaptors, and will seldom do more than clean a pipe surface that is clogged. In a suburb where most houses are fitted with terracotta, earthenware and mixed-material pipe systems, usually linked with rubber fittings, chemical damage may hasten precisely the issues that lead to blockages. Professional jet clearing is quicker, comprehensive, and safe to the drainage system.

Waverley Council has Drain Blockage Guideline which specifies in what circumstances the council can assume responsibility of the blockage of drains due to trees owned by the council. In case a tree on council land, a street tree or a tree in a public reserve, has roots in your sewer or stormwater pipes, you can request council assistance. However, you need to maintain your sewer pipes and have a sewer service diagram. We can offer footage on CCTV and document of the root intrusion which will be a great piece of evidence in case you have to file a claim with Waverley Council.

Three things matter most. Keep cooking oil and food scraps out of the kitchen drain, wipe pans with paper towels before washing. Keep everything except water, toilet paper, and waste out of the sewer system. And if your property has old terracotta pipes and established trees, particularly coastal figs near the cliff-top reserves, schedule an annual CCTV inspection and preventative jet clear. In Dover Heights, where the geology and tree species combine to create aggressive root conditions, annual maintenance is the single best investment in preventing emergency blockages.

Areas We Service Near Dover Heights

We clear blocked drains across Dover Heights and all surrounding Eastern Suburbs locations.

Dover HeightsVaucluseRose BayNorth BondiBondi BeachBondiBellevue HillWatsons BayDouble BayPoint PiperBondi JunctionWoollahraBronteWaverleyQueens ParkDarling Point

Blocked Drain in Dover Heights?

Don't let it get worse. A slow drain today is an overflow tomorrow, and in a home like yours, overflow means damage to surfaces that cost a fortune to replace. Call us and we'll sort it properly.

1300 026 452
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1300 026 452
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