Residential sewer line repair in Denver

Reading the house before reading the pipe

The decade a house in Denver was built predicts its sewer lateral better than anything short of a camera. Pre-1950 houses in Capitol Hill, Baker, Highlands, Washington Park and Park Hill drain through clay tile laid in two- and three-foot sections, each joint packed with mortar or sealed with tar. Those joints are the weak point: the sealant crumbles, the sections shift against each other in moving ground, and every gap admits roots and groundwater. Houses from the late 1940s through the 1960s in the southeast and southwest tracts were often plumbed with Orangeburg, a tar-impregnated fiber pipe that was cheap and light and is now soft, oval and blistered. The mid-century ranch adds a third material, cast iron under the basement slab, which rusts from the bottom up and develops a rough, scaled channel that catches everything flushed down it. Many houses have two or three of these materials spliced together, with the splice itself being the worst joint on the line.

Why the ground here is hard on pipe

Denver's clay soils change volume with moisture, so a lateral is squeezed in a wet May and left unsupported in a dry September, year after year. Frost reaches a few feet down in a hard winter and heaves the shallow end near the house. The lawn above is watered in a climate that would otherwise be dry grassland, and the trees that make the older neighborhoods pleasant, cottonwoods along the parkways, silver maples and elms in the parking strips, ash in the backyards, are all aggressive root growers that find a leaking joint within a season or two. The result is a predictable set of defects: offset joints, root masses at every third joint, a belly where the pipe settled, and in Orangeburg a flattened bore that snags paper.

Matching the fix to the failure

• Open joints, cracks and root intrusion along an otherwise straight run are fixed with a full-length cured-in-place liner, installed through the cleanout and hardened in place. The clay stays in the ground as a form; the new pipe inside it has no joints to open.
• One bad joint or a single break in a sound line is handled with a sectional point repair, a short liner cured over the defect alone.
• Collapsed sections, severely ovaled Orangeburg and lines that are undersized for the house are replaced by pipe bursting, which fractures the old pipe in place and draws new polyethylene through the path it leaves.
• A deep sag that holds standing water cannot be lined flat, and the sagging section is usually excavated and regraded while the rest is lined.

The camera decides which of these applies. the verified installer covering Denver runs that inspection first and quotes from the recording, and the methods are described independently at the CIPP reference.

The sewer scope and the sale

A camera inspection has become part of buying a house in Denver, and inspection reports in the central neighborhoods routinely flag roots, offsets and Orangeburg. A seller who scopes the line before listing can line or burst it on a planned schedule and hand the buyer a post-repair video and a warranty, which removes the single biggest negotiation point on an older house. A buyer who inherits a bad video has a repair quote to carry into the contract. Either way, the recording is the document that matters, and a trenchless installer can turn one around in days.

Permits and the alley grid

Within the city, lateral work needs a Sewer Use and Drainage Permit from the Department of Transportation and Infrastructure, and anything that occupies the alley, sidewalk or street needs a right-of-way permit as well. In the older grid the main often runs down the alley, so the lateral leaves the back of the house rather than the front. A trenchless crew sets up at the cleanout and, for bursting, at a small pit near the alley property line, which keeps the alley open for neighbors and trash pickup. The homeowner owns the lateral all the way to the tap on the main, including the stretch under the alley surface, so keeping that stretch undisturbed is where most of the savings come from. Houses in Denver County but outside the city line are permitted by their own sanitation district.

What the day looks like

For a typical bungalow or ranch, the crew arrives in the morning, jets the line clean, runs the camera, and installs the liner or sets up the bursting pull before midday. Curing or pulling takes the afternoon, the final camera pass documents the finished pipe, and the yard shows a cleanout cap and perhaps a patch of disturbed sod. The written warranty and the before-and-after video go into the house file, where the next buyer's inspector will ask to see them.

Estimates are free. Call now: (720) 606-6223.

Residential services in Denver

Questions about residential work in Denver