Polybutylene for Inspectors
by Nick Gromicko and Kenton Shepard
How Does Polybutylene Fail?
Although it has never been scientifically proven, many believe that oxides from chlorine in public water react with the polybutylene and cause it to flake apart. Small fractures deepen over time and eventually work their way to the pipe exterior, allowing the water to escape. PB manufacturers such as Shell Oil and Dupont De Nemours maintain that the leakages reported are a result of improper installation, rather than the presence of any defects in the material itself. Manufacturers cite the fact that the majority of leaks occur at joints and unions, which is where a leak would likely appear if a pipe were improperly installed. Regardless of the cause, class action lawsuits filed against PB manufacturers have been successful and resulted in immense payouts to homeowners. The largest such claim was a $1 billion settlement paid by Shell Oil to select homeowners.
Polybutylene Pipes Should Be Replaced
Although no regulations require the replacement of polybutylene pipes with those made from other materials, many plumbers recommend this action, which can cost several thousand dollars. Leakage happens without warning and results in flooding and serious damage to a home’s interior if it is not immediately stopped. PB pipes behind sheetrock can leak unnoticed for long periods of time and cause mold and water damage. InterNACHI believes it is far cheaper to replace polybutylene pipes before they fail and release their contents onto floors, appliances and furniture. They can also reduce a home’s value or prolong its time on the market. Homeowners might face higher insurance premiums or be denied coverage entirely.
An inspector can use the following tips to identify polybutylene plumbing. Polybutylene pipes are:
- usually stamped with the code “PB2110”;
- flexible and sometimes curved, unlike rigid piping materials such as copper;
- not used for waste, drain or vent piping;
- most commonly grey in color, but they can also be white, silver, black or blue. Blue PB is used primarily outdoors and should only be used to carry cold water. Inspectors should be aware that black or white pipes might not be polybutylene (they might be polyethylene or PVC, respectively). Also, PB color is somewhat region-dependant. For instance, experienced home inspectors in California might never come across grey PB, while it is quite common elsewhere;
- ½” to 1” in diameter.
- protruding from walls to feed sinks and toilets;
- running across the ceiling in unfinished basements;
- near the water heater.
- entering the home through the basement wall;
- at the water meter;
- at the main water shut-off valve.
- Home inspectors are not required to note the presence of polybutylene, and no tests for weaknesses should be performed. Any deterioration of polybutylene pipes happens from within and cannot be detected without turning off the water and dismantling the pipe, which is far beyond the standards of practice of home inspection.
- Inspectors should check an entire pipe for PB, not just a portion of it. Some copper piping systems have been found to use PB at junctures. A common example of this union is where PB pipe links with copper “stub outs” that feed bathroom fixtures.
Other piping materials not to be confused with PB:
- PEX (pictured at right): Common in radiant-heating systems, this cross-linked polyethylene can be black, blue or red. It is more easily coiled and more flexible than PB. It can withstand higher temperatures than polyethylene.
- PVC: A popular building material commonly used in residential plumbing. CPVC is derived from PVC and is also used in plumbing. Both appear white or off-white and can be flexible or rigid.
- Polyethylene: This material is flexible and black.
- Copper: Copper is a metal that should never be confused with PB.
If in doubt, a licensed plumber can be contacted to determine whether or not a pipe is made from PB.
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