Commercial sewer and drain lining in Hartford

Heavier loads on the same old pipe

The drains beneath a commercial building in Hartford are made of the same clay, cast iron, Orangeburg or PVC found under houses, but they are asked to do far more. A restaurant sends hot, soapy, grease-laden water down a cast iron line from open to close. A retail center's lateral may travel several hundred feet beneath a parking lot before it reaches a main as old as the street. An apartment building loads multiple floors of bathrooms onto a single vertical drain sized for fewer occupants than it serves today. The failures vary with the age of the building and the ground it sits on: roots at joints, corrosion in iron, offsets where soil has shifted, bellies over soft backfill, groundwater entering at every seam. What differs from a house is the consequence. A commercial backup shuts down a kitchen, floods a tenant and brings the health department to the door.

Trenchless on a commercial site

Cured-in-place lining renews the drain from within. The line is jetted clean, a liner soaked in resin is drawn or inverted into it, inflated against the wall and cured into a seamless pipe inside the old one. The kitchen tile, the slab, the parking lot and the sidewalk remain closed. The same principle covers a 2-inch branch beneath a slab and a 12-inch lateral beneath the lot; only the equipment changes. Vertical stacks and under-floor branches in an older building are reached by way of a cleanout, a roof vent or a removed fixture rather than by opening walls. Where the camera shows a lateral that has caved in, pipe bursting replaces it between two small pits, one of which can often be positioned inside an existing manhole or cleanout vault. The method itself is explained at the CIPP reference.

Most of the work is cleaning

What separates a commercial lining job from a residential one is the preparation. A kitchen line carries years of grease on its walls and a cast iron drain carries scale, and a liner adheres only to clean pipe. Hydro jetting with a nozzle chosen for the deposit, often in several passes with the camera checking between them, returns the pipe to its original bore before the liner goes in. The effort is repaid twice over: every joint and crack in the run is sealed by the liner, and its smooth interior resists grease buildup far better than rough metal, so maintenance jetting is needed much less often afterward.

Working around operations

Commercial lining is planned to the hour. The camera survey and the written condition report are completed during normal operations. The installation is booked for an overnight, a weekend or a scheduled closure, with the no-water period stated in writing, and the drains are back before opening. In a multi-tenant building the work is phased so that one stack or one wing is out of service at a time, and the schedule is written up so tenants can be notified in advance. The season has little to do with it, since the work is in the pipe and the cure is controlled by the crew.

Documents for the owner and the lender

Property owners, managers and their engineers run on paperwork, and a lining project produces it: footage and a condition report from the survey, the permit record, certification of the liner material along with its engineering basis, footage of the cured liner and the warranty in writing. A lender requests the same documents at refinancing and a buyer requests at sale. The contractors in the verified commercial installer directory have had their license, equipment and completed projects checked before listing, and the installer verification process describes what that review covers.

When to make the call

If a Hartford building has recurring backups, a drain that gets jetted every few months, a plumber's report that mentions roots or channeling, or a slab that stays damp for no visible reason, the sensible move is to order a camera survey and a written report. That report names the pipe material, the defects and the method, and it lets the contractor commit to a fixed price instead of an open-ended one. It also gives a manager a record to hand to ownership before any money is committed.

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