The situation
Illustrative example. Not a real job or customer.
A raised-foundation house in an older part of Fullerton has had several plumbing repairs over the years. A remodeled bathroom has copper, the kitchen has copper, but the crawlspace still has galvanized lines feeding them. A leak appears where a copper section was joined directly to galvanized pipe.
- The owner uses the pipe worksheet and finds copper at fixtures but galvanized in the crawlspace and at the main.
- A plumber points out corrosion where the two metals meet without a dielectric fitting.
- The owner asks for both a partial and a whole-house option in writing.
The plumber explains that replacing only the leaking transition would leave galvanized feeding everything, so discoloration and pressure loss would continue.
The two scopes
Partial: replace remaining galvanized
- Replace crawlspace galvanized and the main line.
- Keep the newer copper at the remodeled bathroom and kitchen.
- Fewer wall openings because the crawlspace gives access.
- Transitions to existing copper must be done properly.
Whole-house repipe
- Every line new and the same material.
- New valves throughout.
- More wall work at fixtures that were already updated.
- No question about the age of the remaining copper.
Why the partial scope fit here
Unlike a slab home, this house had a crawlspace that gave easy access to the main runs. The copper at the remodeled rooms was relatively recent and looked sound when inspected. Replacing all the galvanized, including the main, removed the source of rust without redoing newer work.
In a house where the copper was the same age as the galvanized, or where access was harder, the answer could easily have been a whole-house repipe.
Terms from this example
- Raised foundation
- A house built over a crawlspace rather than directly on a slab.
- Transition
- The point where one pipe material connects to another.
- Dielectric fitting
- A connector that separates dissimilar metals to slow corrosion.
Questions this owner asked
- How old is the copper you plan to keep, and how does it look?
- Will any galvanized remain after the job?
- How will you connect new pipe to existing copper?
Common questions
Is this a real house?
No. It is invented to illustrate a common situation.
Is a crawlspace an advantage for repiping?
Often, because lines can run underneath with less wall work.
Should mixed metals always be replaced?
Not always, but direct copper-to-galvanized joints deserve inspection.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.