Does a repipe always mean opening a lot of walls?

Plumbers often route new lines through closets, basements and attics to limit openings, but some drywall or plaster work is usually needed. Ask for a plan showing where walls will be opened.

Galvanized and Early Copper Pipe Leaks in Older Denver Homes

At a glance

Galvanized steel: Common in homes built before about the 1960s; corrodes from the inside
Typical failure: Leaks at threaded joints, rust-colored water, falling pressure
Copper: Long-lived but can develop pinhole leaks in some conditions
Who evaluates it: A licensed plumber; repiping usually needs a permit
Season: Can fail at any time of year, not just in cold snaps

How old pipe fails

Galvanized steel pipe was coated with zinc to resist rust, but over decades that coating wears through and the inside of the pipe builds up scale. The wall gets thinner, especially at threaded joints where the metal was cut. The result is usually a weeping joint or a crack at a fitting, though a badly corroded section can split when it is bumped during other work or stressed by a pressure change.

Copper is more durable, and many Denver homes have copper that is still sound. Pinhole leaks do happen, though, and they are often tiny at first: a spray inside a wall that soaks insulation and framing for weeks before anyone sees a stain. Some houses have a mix of materials after partial repairs, and the joints between different metals can corrode faster if they were not connected with the right fitting.

Mixed or patched plumbing is common in older neighborhoods like Highland, Baker, Congress Park and Park Hill, where houses have been remodeled several times. A plumber can tell you what you have and how much life it likely has left.

Age failure versus freeze break

The difference matters for repairs and can matter for an insurance conversation.

Corrosion or age failure

Often a slow drip or weep before a larger leak
Rust staining, mineral crust or green corrosion at joints
Can happen in summer or in a heated interior wall
Neighboring sections may be just as worn

Freeze break

Usually sudden, often noticed when the ice thaws
Lengthwise split or bulge in the pipe
Located near exterior walls, garages or crawlspaces
Surrounding pipe may be in reasonable condition

What to do with what you find

IfOne pinhole leak in otherwise clean copperThenA spot repair may be reasonable. Ask the plumber to look at nearby runs and note the water pressure.
IfRepeated leaks or rusty water from galvanized linesThenAsk for a repipe estimate and whether a permit is required from Denver Community Planning and Development.
IfA leak was found behind a finished wallThenHave moisture mapped before the wall is closed; slow leaks often wet more area than the visible stain suggests.
IfLow pressure on upper floors onlyThenThis can be scale buildup in old galvanized pipe. Ask the plumber whether the line should be replaced before it fails.

Warning signs worth a plumber visit

Brown or orange water when a tap first opens after sitting
Pressure that has dropped over months or years
White, green or rust-colored crust on visible joints
Damp spots on ceilings below bathrooms without an obvious overflow
A water bill that rises with no change in use
The sound of running water when every fixture is off

Common questions

Does a repipe always mean opening a lot of walls?: Plumbers often route new lines through closets, basements and attics to limit openings, but some drywall or plaster work is usually needed. Ask for a plan showing where walls will be opened.

General information for Denver, not a quote or professional advice. In an emergency, call 911.