Broken sewer pipe under the house in Denver, Colorado

What a broken sewer pipe under the house looks like from inside

A broken sewer pipe under the house in Denver, Colorado announces itself differently from a break in the yard. Because the pipe runs beneath a slab or through a crawlspace, the leak has nowhere to go but into the structure. Watch for a sewer smell that comes and goes with no obvious source, damp or discolored patches on a concrete floor, warm spots if the break is near a hot water line, and tile or wood flooring that lifts or cups along a line. Several fixtures draining slowly at once and gurgling from a tub when a toilet is flushed point to the main line rather than a single fixture. In a crawlspace the signs are more direct: standing water, saturated soil and a strong odor.

Confirming it before anyone digs

The diagnosis comes from a camera, not from the symptoms. An operator runs a CCTV camera from a cleanout or a pulled toilet and follows the line under the house, recording the footage counter at every defect. A locator held above the floor picks up the camera head, so the exact position and depth of the break are marked on the slab with tape. A hydrostatic test, plugging the line and filling it with water to see if the level holds, confirms a leak even when the camera cannot show where. Insist on the video file and the markings.

Why slab excavation is the last resort

• Everything above the pipe is removed first. Flooring, cabinetry, sometimes a wall, then the concrete is saw-cut and broken out, and the soil beneath is dug by hand because there is no room for a machine.
• The dust and noise are inside the house. Concrete cutting in a living space means sealing rooms with plastic, running negative air, and living elsewhere for the duration.
• The repair is a small part of the bill. The pipe work takes an hour. Breaking out, backfilling, pouring new concrete and restoring the floor finish takes days and often costs more than the plumbing.
• A slab that has been cut is never quite the same. Patches can settle, crack at the edges and telegraph through flooring.

Slab excavation is still right when the pipe has collapsed or is missing a length, because a liner needs a host pipe to form against. Short of that, there is a better way in.

Lining from a cleanout

Cured-in-place pipe lining reaches the break from wherever the pipe can be accessed, which is almost never through the floor. A resin-saturated felt or fiberglass tube is inverted or pulled into the line from an outside cleanout, a roof vent, a pulled toilet or a small hole in the slab at a closet or garage where the floor finish does not matter. Air or water pressure presses the tube against the old pipe, including across the break, and the resin cures with hot water, steam or UV light into a new jointless pipe. Branch lines to fixtures are reopened from inside with a robotic cutter. A post-lining video confirms the wall is smooth and every connection is open. For most under-house breaks that still hold shape, under-slab sewer pipe repair in Denver is the repair, and the homeowner's part is mostly staying off the drains for a day.

Sectional repairs beneath the floor

When the video shows one crack or one separated joint on an otherwise sound run, a full-length liner is more than the pipe needs. A sectional CIPP repair places a short liner, typically a few feet long, over just that defect. The fiberglass sleeve is wrapped around an inflatable packer, pushed through the line to the marked location, inflated to press the sleeve against the wall and left to cure at ambient temperature before the packer is deflated and pulled out. It seals the break with an overlap onto sound pipe on both sides, and it can be done from the same cleanout. Several defects far apart can be handled in one visit; several close together argue for lining the whole run.

When the floor still has to open

Some breaks cannot be reached from inside the pipe. A section that has collapsed flat, a joint offset so far that the camera cannot pass, a pipe crushed by a footing, or a belly deep enough to hold standing waste all need the pipe physically replaced. Under a slab the options are a targeted cut at the marked location, tunneling from outside the foundation along the pipe alignment so the interior floor stays whole, or pipe bursting between two pits placed outside the footprint where the alignment allows. Tunneling and bursting cost more than a liner but keep the living space intact, and the best answer usually lines what can be lined and replaces only the failed length. A description of lining a sewer line beneath a foundation shows what the liner does across a break under a foundation, and verified CIPP installers serving Denver identifies installers who have documented under-slab lining and repair work.

Living with the house during the repair

A lining or sectional job under a house in Denver is usually a single day with the drains out of service for a few hours during the cure. Tunneling runs several days but the work is outside and beneath the house, not in it. A slab cut is the only option that turns rooms into a construction zone. Whichever path the video points to, ask for the pre- and post-repair video and a separate statement of the warranty on the liner and on the labor.

Common questions in Denver