Sewer lateral repair: the options, in the order they are weighed

A lateral can be repaired in four broad ways, and they are not interchangeable. The order below is the order in which they are usually weighed, from the least disruptive to the most. Each step is taken only when the one before it does not fit what the camera shows.

First, is it a repair at all

A backup is often a blockage rather than a defect: grease, wipes, roots that can be cut out. Clearing it is maintenance, not repair, and it should be followed by a camera run to see whether something in the pipe caused it. Treating every backup as a failed pipe is how owners end up paying for work they did not need.

Spot repair

When the footage shows one defect in an otherwise sound pipe, a single cracked joint or a short open section, a sectional liner or a local excavation can deal with that point alone. It is the cheapest option when it fits, and the wrong one when the defect is one of many, because the next joint along is usually in the same condition.

A spot repair also leaves the rest of the pipe exactly as it was. That is fine when the rest of the pipe is sound, and it should be shown to be sound on the same footage before the spot repair is agreed. Where the recording shows several weak joints but only one has failed, the honest conversation is about how long the others are likely to last, not only about the one that is leaking today.

Lining the full length

Where the pipe is cracked, jointed badly or infiltrated along its length but still holds its shape and its fall, a cured-in-place liner forms a new pipe inside the old one without a trench. What lining is, physically, is described in the article on CIPP lining. It does not correct a sag, and it cannot be installed through a section that has collapsed.

Bursting and replacing

Where the pipe has lost its shape, is too small, or has failed in too many places to line, it can be broken outward and replaced by pulling a new pipe through the same path. Bursting needs a pit at each end and enough room for the old pipe to go into the soil. The comparison with lining is in the lining versus bursting article.

Open cut

Digging the lateral up and relaying it remains the right answer when the fall is wrong, when there is a belly that holds water, when the route has to change, or when the pipe is shallow and the ground above it is lawn rather than slab. Trenchless methods are not automatically better, and a contractor who never recommends digging only owns one kind of equipment.

What changes the order

What sits above the pipe: a driveway, a mature tree, a slab, a neighbour’s yard. Whether the defect is on your side of the ownership line or the utility’s. Whether the connection to the main is sound. And whether a permit for work in the street is needed, which can take longer to obtain than the repair takes to do.

Timing matters too. A lateral that backs up once a year can usually wait for a planned repair in good weather, with quotes compared properly. A lateral that has collapsed, or is sending sewage into a basement, cannot, and the choice of method narrows to whatever restores flow quickly and safely. Separating the two situations is the first thing we do on a call.

How to judge a recommendation

Ask which defects, at which distances, the chosen method addresses, and what it leaves behind. A good recommendation names both. Our own scope for trenchless work is on the trenchless repair page, and we say plainly when the answer is a shovel.