Copper Pipe Plumbing: Still Worth It?

Copper pipe has been the gold standard for residential plumbing in the United States for most of a century. It's durable, well understood, and accepted by every plumbing code in the country. But with PEX and CPVC taking over a huge share of new installs, a lot of Nashville homeowners are asking the obvious question: is copper pipe plumbing still worth it?

Short answer: in the right situation, absolutely. In a lot of other situations, the right call is something else. Here's the honest breakdown.

Why Copper Earned Its Reputation

Copper has been used in plumbing for a long time for good reason.

• Longevity. A properly installed copper system can outlast the structure it serves. Plenty of homes in Nashville have original copper from the 1960s and 70s still doing the job.
• Heat tolerance. Copper handles high water temperatures without softening or warping. It's the natural fit for hot water service.
• Pressure handling. It tolerates high pressure and pressure spikes well.
• Fire resistance. Copper doesn't burn or release toxic fumes if a fire reaches it.
• Recognized by code. Every jurisdiction allows copper in some form.

The Types of Copper You'll Hear About

Copper pipe comes in three main wall thicknesses, identified by color:

• Type M (red lettering) — the thinnest residential copper, used for above-ground potable water in most homes.
• Type L (blue lettering) — a step thicker, often required for underground or under-slab service.
• Type K (green lettering) — the thickest, used for buried water service lines.

For an average Nashville home repipe, type L is the typical choice for the main runs, with type M used for branch lines where allowed.

Where Copper Still Wins

There are situations where copper is still the right call:

• Outdoor or buried service lines where rodents or UV would attack PEX.
• Sections near a water heater where the first foot or so of pipe needs to handle high temperatures.
• Homes with a mix of original copper where you want a clean tie-in without transition fittings.
• Buyers and inspectors who specifically value it. In some segments of the Nashville real estate market, "all copper" is still seen as a premium feature.

Where Copper Struggles

It's not all rosy. Copper has real weaknesses, especially over the last twenty years:

• Pinhole leaks. Certain water chemistries can chew tiny holes through copper wall over time. We see this in homes where the incoming water is unusually aggressive.
• Theft and scrap value. Vacant or under-construction buildings have been hit for their copper. This isn't a working-house problem, but it's a real problem on renovations.
• Cost. Copper material costs more than PEX, sometimes a lot more. The price also swings with commodity markets.
• Labor time. Soldering joints is slower than crimping PEX. That labor difference adds up on a whole-house repipe.
• Freezing. Copper doesn't expand the way PEX does, so a hard freeze that PEX would survive can split a copper line.

How a Copper Repipe Actually Goes

If you decide copper is the right material for your home, here's the typical flow of a whole-house copper repipe:

1. The plumber maps every supply run from the main shutoff to every fixture, identifying the cleanest paths and noting where drywall has to come open.
2. Water is shut off and the existing supply lines are cut and capped, fixture by fixture.
3. New copper runs are routed, cut, deburred, fluxed, and soldered or pressed together.
4. Joints are pressure-tested before walls go back up.
5. Drywall is repaired. (Some plumbers handle this; many leave it to a drywall finisher.)
6. The system is sanitized, refilled, and every fixture is run.

A typical Nashville home in the 1,500–2,500 square-foot range is a multi-day project. The price hinges on access — homes on slab and homes with finished basements take longer because more wall has to come open.

Copper vs. PEX in 2026

Most new installs in Nashville today default to PEX for branch lines and copper for the short sections near water heaters and the main shutoff. That hybrid approach captures the strengths of both materials: copper where temperature and rigidity matter, PEX where speed, flexibility, and freeze tolerance pay off.

For a repipe in an older home, the call depends on water chemistry, your budget, how long you plan to stay, and what you want the inside of your walls to look like a decade from now. A walk-through with a plumber is the fastest way to land on the right answer.