Copper Piping
Updated February 24, 2026
The traditional standard for residential plumbing. Durable, bacteriostatic, and long-lasting. Available in rigid and flexible (soft) forms. Typical price range: $2.00 – $8.00/ft. Best for: Outdoor use, high-quality installations.
Overview
Copper has been the standard for residential water supply lines for over 70 years. Type M (thin wall) is standard for residential supply. Type L (medium wall) is used for commercial and outdoor burial. Copper is durable, corrosion-resistant in most water conditions, bacteriostatic (inhibits bacterial growth), and fully recyclable. Joints are soldered (sweated) with flux and lead-free solder, or connected with push-fit fittings. The main drawback: cost. Copper is significantly more expensive than PEX and requires soldering skill or push-fit fittings for connections.
How to Choose Copper Piping
Copper Piping are best suited for outdoor use, high-quality installations. They typically cost $2.00 – $8.00/ft, so plan your budget accordingly. Sizing is important — residential supply lines are typically 3/4 inch (main runs) and 1/2 inch (branch lines to fixtures). type m is standard ... Key advantages include extremely durable and bacteriostatic.
Pros & Cons
- Extremely durable
- Bacteriostatic
- Recyclable
- UV resistant
- Expensive
- Requires soldering
- Can corrode in acidic water
- Freezing can burst
Key Features
- Proven 50+ year lifespan in residential water supply applications
- Bacteriostatic -- inhibits bacterial growth inside the pipe
- Handles high temperatures and UV exposure (can be used outdoors)
- Fully recyclable -- has scrap value at end of life
- Rigid pipe maintains shape and supports itself between hangers
Top Brands for Copper Piping
Sizing & Selection
Residential supply lines are typically 3/4 inch (main runs) and 1/2 inch (branch lines to fixtures). Type M is standard wall thickness for interior residential. Type L for underground, exterior, or commercial. Measure outside diameter (OD) -- 1/2 inch copper has 5/8 inch OD, 3/4 inch has 7/8 inch OD. Fittings are sized by nominal pipe size, not OD.
Installation
Cut with a tube cutter (not a hacksaw for clean cuts). Deburr inside and outside. Clean both pipe end and fitting socket with emery cloth until shiny. Apply flux, assemble, and solder with lead-free solder and a propane torch. Push-fit fittings (SharkBite) eliminate soldering entirely -- cut, deburr, push in. Copper must be supported with hangers every 6-8 feet on horizontal runs.
Maintenance
- Inspect exposed copper annually for green patina (normal) vs. pinhole leaks (green crusty spots with dripping).
- In aggressive water (low pH, high chlorine), copper corrodes faster. Test water annually if you notice blue-green staining in sinks.
- Insulate copper pipes in unheated spaces -- copper conducts cold and freezes faster than plastic pipe.
- Dielectric unions required where copper connects to galvanized steel -- prevents galvanic corrosion.
Buying Tips
- Type M is sufficient for all residential interior supply lines. Do not overspend on Type L unless code requires it.
- Buy copper in 10-foot sticks. Pre-measure and plan your layout to minimize waste -- copper is expensive.
- Lead-free solder is required by code for all potable water systems. Do not use 50/50 tin-lead solder.
- Push-fit fittings cost more per connection than soldering but save hours of labor. Use them for repairs and tight spaces.
- Copper prices fluctuate with commodity markets. Check current prices before budgeting a repipe project.
Frequently Asked Questions
What are the advantages of copper piping?
Extremely durable Bacteriostatic Recyclable UV resistant
What are the disadvantages of copper piping?
Expensive Requires soldering Can corrode in acidic water Freezing can burst
Who should buy copper piping?
Copper Piping are best for: Outdoor use, high-quality installations.
How are copper piping installed?
Cut with a tube cutter (not a hacksaw for clean cuts). Deburr inside and outside. Clean both pipe end and fitting socket with emery cloth until shiny. Apply flux, assemble, and solder with lead-free solder and a propane torch. Push-fit fittings (SharkBite) eliminate soldering entirely -- cut, deburr, push in. Copper must be supported with hangers every 6-8 feet on horizontal runs.
How do I choose the right size for copper piping?
Residential supply lines are typically 3/4 inch (main runs) and 1/2 inch (branch lines to fixtures). Type M is standard wall thickness for interior residential. Type L for underground, exterior, or commercial. Measure outside diameter (OD) -- 1/2 inch copper has 5/8 inch OD, 3/4 inch has 7/8 inch OD. Fittings are sized by nominal pipe size, not OD.
What are the best brands for copper piping?
Top brands for copper piping include Apollo, BrassCraft, Canplas, Charlotte Pipe. Each offers different price tiers and product lines.
How do I maintain copper piping?
Key maintenance tips: Inspect exposed copper annually for green patina (normal) vs. pinhole leaks (green crusty spots with dripping).. In aggressive water (low pH, high chlorine), copper corrodes faster. Test water annually if you notice blue-green staining in sinks.. Insulate copper pipes in unheated spaces -- copper conducts cold and freezes faster than plastic pipe..