Galvanized pipe vs. copper

Written by herbert harris
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Galvanized pipe vs. copper
Plumbing fixtures made of copper. (plumbing image by Inger Anne Hulbækdal from Fotolia.com)

Home builders have numerous materials from which to choose when deciding on plumbing installation in residences. Among the metals--copper, lead and galvanised pipe--copper is the most common choice. In addition to these metal materials, there are also numerous other non-metal materials that can perform the same duty as copper-based plumbing pipe. These include the thermoplastics PVC, CPVC and PEX.

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Advantages of Galvanized Pipe

Galvanised pipe, which has a zinc coating that inhibits corrosion, is more durable than older pipes constructed of steel or iron. Galvanised pipes can last as long as 40 years and are suited for large construction projects. Galvanised pipe is also suitable for use in sewage plumbing and irrigation systems used in farming. Galvanised pipe is most commonly used for well casings and handrails.

Galvanized pipe vs. copper
Galvanised pipe installed in outside weather conditions. (pipe fitting image by Joann Cooper from Fotolia.com)

Disadvantages of Galvanized Pipe

Galvanised steel pipe is still employed in some residential applications but is rarely used inside the home due to the tendency for rust to build up in small-diameter pipes, leading to restricted water flow and low water pressure. When used to transport natural gas, the gas erodes the zinc coating in galvanised pipes and the flakes of zinc clog the pipe. The lead content of galvanised pipes can lead to early corrosion.

Advantages of Copper Pipe

Copper is the material most often used by today's home-builders and homeowners when installing plumbing. Copper pipe is available in small diameters for installation in tight spaces. Copper plumbing is lead-free, making it safer than galvanised pipe. Copper pipes are biostatic and inhibit the growth of bacteria. Copper plumbing requires less maintenance and fewer repairs over time and is naturally resistant to corrosion. Installing copper plumbing increases the value of a home.

Disadvantages of Copper Pipe

Copper plumbing pipes can sometimes fail when water temperature is above 82.2 degrees C. Copper pipes are susceptible to the formation of condensation inside the pipe. If this condensation freezes it can restrict or even block water flow. Copper plumbing can also introduce a metallic taste to water. And copper pipes are more expensive to repair and install than other pipes, such as PVC.

Considerations

Approximately 95 per cent of existing homes have copper plumbing, and more than 80percent of new homes are constructed using copper for water-supply piping. Real estate agents assert that an all-copper plumbing system adds value to homes that are for sale. In addition, copper is the one and only water-supply piping material available with a 50-year warranty.

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