Cast Iron Drain Stack Replacement in Denver, CO
Cast iron was the drain and vent standard in Denver homes into the 1970s. It fails from the inside, scaling and then rusting through along the bottom of horizontal runs. When a stack goes, you get recurring backups, sewer odor, and eventually a wet wall.
- Camera inspection before any stack is condemned
- Replaced in PVC or cast iron where sound control matters
- Common in prewar and postwar homes across the older metro
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What it is
Cast iron drain stack replacement Cast iron drain stack replacement is the removal of an old cast iron drain and vent pipe that has scaled or rusted through and its replacement with new PVC or cast iron pipe.
A Denver homeowner should care because a corroded stack causes recurring backups and sewer odor that only get worse until the pipe is replaced.
Scaled cast iron behaves like a clogged artery
Rust and buildup narrow the pipe until the diameter no longer carries what the fixtures send. Cabling clears a channel through the buildup, then it closes again in months. A camera shows the difference between a clog and a stack that is structurally gone.
- Ends the cycle of clearing the same line every few months
- Removes sewer odor coming through corroded pipe walls
- Prevents the wet wall that follows a rot-through
- PVC replacement restores full drain diameter
Signs the cast iron stack is failing
- Recurring backups that return after every cleaning
- Sewer smell in a bathroom or basement with no visible leak
- Rust flakes or debris in the tub or floor drain
- Damp or stained drywall along the stack chase
- Camera shows heavy scale or a rusted-out channel at the bottom of the pipe
- House built before roughly 1975 with original drains
What a stack replacement involves
- Camera inspection to document scale, cracks, and rot-through
- Scope covering the vertical stack, horizontal branches, and the base fitting
- PVC replacement, or cast iron where noise transmission is a concern
- Proper venting maintained or corrected to current code
- Access through chases and closets where possible to limit demolition
- Permit, inspection, and patching of opened walls
What to expect and how the work gets done
- 1
Camera the line
Confirm whether this is a clog, heavy scale, or structural failure.
- 2
Plan access
Find the chase, closet, or wall run that minimizes demolition.
- 3
Replace
Cut out the failed stack and branches, install new pipe, correct venting.
- 4
Test and inspect
Fill test, inspection, then wall repair.
Credentials, reviews, and company proof
- Colorado Master PlumberRepipe work is permitted and inspected, with the whole system signed off, not patched section by section.
- Plumbing Contractor license 2110Licensed to pull permits on supply, drain, and service line replacement.
- Serving Denver since 2006Two decades opening walls in prewar bungalows, postwar ranches, and 1980s builds across the metro.
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Cast iron stack replacement cost factors
Stack height, branch count, and how much finished surface has to come off drive the number.
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- Number of floors the stack serves
- Branch lines and fixtures tying into it
- Access through a chase versus opening finished walls or tile
- PVC versus cast iron replacement material
- Whether the underslab or basement horizontal run is also failed
- Permit, inspection, and finish repair
Frequently asked questions
Neighborhoods where cast iron stacks are still in service
Cast iron waste is concentrated in the oldest parts of the metro, and access changes a great deal depending on how the house was built.
- BakerVictorian era cottages and terrace rows still running on galvanized supply and cast iron waste.
- Curtis ParkDenver's oldest surviving row houses, many split into duplexes, with risers and stacks buried in party walls.
- Capitol HillConverted mansions and walk up apartment blocks where one riser and one stack serve four floors.
- Congress ParkBungalows and squares built for one bathroom, most of them now carrying two or three.
Related services
Drain scope video inspection
See inside the stack before deciding.
View drain scope video inspection servicesSewer smell in bathroom
A classic failing stack symptom.
View sewer smell in bathroom servicesPlumbing in Applewood, CO
1950s and 1960s homes with original cast iron.
View plumbing in applewood, co servicesLicenses, credentials, and company proof
- Colorado Master PlumberLicense MP-00189274
- Colorado State Plumbing ContractorLicense 2110
- Family Owned & OperatedServing Denver since 2006, 20 years
- Better Business BureauAccredited Business, A+ rating
- Angie's List Super Service Award2012 through 2017
- Serving Denver since 2006Residential and commercial properties across the metro
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Recurring backups in an older house?
Get a camera inspection before you pay for another cleaning.