Sewer pipe line repair in Denver: how to choose the fix

What breaks under a Denver yard

Most of the sewer laterals under older Denver neighborhoods were laid before 1960 in short lengths of vitrified clay tile, with cast iron carrying the line under the basement floor. The 1950s and 1960s subdivisions often got Orangeburg, a fiber pipe that softens and ovals with age. PVC arrived in the 1970s, but every pipe in Denver sits in the same ground: expansive bentonite clay that swells when it is wet and shrinks when it dries. Every snowmelt and every summer cloudburst moves that soil, and a rigid pipe made of three-foot sections cannot move with it. Joints open, a section drops and forms a belly, and the roots of the mature elms, cottonwoods and silver maples that line Front Range streets follow the moisture straight into the gap.

Frost adds a second cycle. The ground freezes to about three feet in a hard winter and thaws from the top down each spring, and shallow sections near the foundation wall take the worst of the movement. The first sign is usually a basement floor drain that backs up, because it is the lowest fixture in the house.

What the video has to show you

Nothing on this site matters until a camera has been through your Denver line. The footage should include the running distance counter, the pipe material, a locate at each defect that gives depth and position in the yard, and the connection at the main. Roots look like hair at the joints. An offset shows as a step or a crescent of soil. A belly shows as standing water the camera swims through, and the counter tells you how long it is. Scale in cast iron looks like coral. Ask for the file itself, not a summary, and watch it before you discuss methods.

Matching the repair to the failure

Each picture points to a different fix.

• Root intrusion, cracks and open joints along a pipe that still holds its shape: cured-in-place lining of the whole run, cured in a single working day.
• One offset or one broken joint on an otherwise sound line: a sectional point repair, a short sleeve set over the one bad spot.
• Collapsed sections, badly ovaled Orangeburg, or a four-inch line that is too small for the house it now serves: pipe bursting, which pulls new HDPE through the old path.
• A belly: no liner can lift a pipe that has sunk. The low section is excavated, rebedded and replaced, and the rest of the line can still be lined or burst.

A contractor who proposes lining a belly, or digging up a Denver yard for roots in a straight pipe, has skipped the matching step. The methods and their limits are laid out at the cured-in-place pipe reference site.

The street, the alley and the permit

Many laterals in Denver run forty to a hundred feet from the house, under the tree lawn or back through the alley, before reaching a main under public pavement. In most Front Range cities the owner is responsible for that whole length, and work in the right-of-way needs a permit, a licensed contractor, traffic control and restoration of concrete or asphalt to the city's standard. That restoration can cost as much as the repair. Trenchless methods are popular here for exactly that reason: a liner or a burst pipe reaches the main from a cleanout or a pit on your side of the sidewalk. The crew still pulls the right-of-way permit whenever a pit or the connection touches public ground.

Winter, snowmelt and the calendar

Sewer failures in Denver County cluster around spring snowmelt and the July and August storm season, when the ground is saturated and roots grow fastest. The repair does not have to wait for June, though. Hot-water and steam cures work in January, and a pit dug through a foot of frost is slower but routine. If you find a problem in the fall, a camera visit and a cleaning can hold the line through winter and let you schedule the permanent repair on your terms rather than on the night the floor drain overflows.

What the warranty and the final video should say

The job ends with a second camera run through the finished pipe, with the same footage counter, so you can compare it joint for joint with the first. A written warranty should name the method, the length covered, the term, and what the contractor will do if the line fails inside that term. That document and both videos go in your house file; the next buyer's inspector will ask for them. the All Sewer and Plumbing Services, LLC service page for Denver describes how the crew handles Denver laterals, and the verified CIPP installer profile for All Sewer and Plumbing Services, LLC shows the installer's listing and the standards behind it. To get a camera into the line, call (720) 606-6223. Estimates are free. Call now.