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The Critical Eye!

Michael Leavitt’s professional inspection related blog.

Polybutylene Pipe - What’s The Big Deal???

Polybutylene Pipe - What’s The Big Deal???


b2ap3_thumbnail_1Michael_Leavitt_160_20130418-202348_1.jpgAs a Master Home Inspector inspecting in Northern Utah, part of my responsibility inspecting homes is to identify the types of piping used to supply water throughout the home. The piping that always draws the most attention is polybutylene.

  • Have you ever wondered why home inspectors always make such a big deal about polybutylene piping?
  • Is there really anything to worry about if you have it in your home?

When polybutylene piping is identified during an inspection the inspector should always include a recommendation for further evaluation by a qualified plumber. It is that recommendation that always gets the client, the seller and the agents asking the same questions.

It is our hope that you share this information with your entire circle of influence to help raise awareness.


Polybutylene pipe is a plastic water supply piping that hit the market in the mid to late 1970’s and was used in the residential marketplace all the way through the mid 1990’s. Typically it is gray in color and it was marketed as the “pipe of the future.” It came in huge rolls and the up side was how easy it was to install compared to copper pipe. The polybutylene joints were made with crimp rings instead of the traditional torch and solder. Plumbers also loved it because they were the only ones with the tools to install the crimp rings and when there was a leak issue it had to be professionally corrected.

The water damage issues started to appear by the 1980’s as many of the pipes began to fail. When the pipes were opened up the plumbers found degradation to the interior walls of the pipes and plastic fittings.

Polybutylene was widely used throughout the country and it is estimated to have been installed in over ten million structures country wide.


Courtesy of

The experts are divided on this issue as to why the higher than normal failure rates.  Some have blamed leaving the piping exposed to the direct sunlight before installation. Others blame the chemical make-up and over chlorination of the water flowing through them. I believe that it is more the latter because there are certain municipalities that suffer damage in nearly every installation, while there are many other areas in the country where the failures are no more common than that of homes plumbed with copper, PEX, CPVC, and galvanized piping.

The real difficulty lies in the fact that you cannot see what is going on inside the pipes. The polybutylene pipes can look just fine on the outside one day and the next day either the pipe, the fitting, or the crimp ring can fail andthen the water flow floods the home. The best recommendation is to have an plumber who is experienced with polybutylene piping failures evaluate the system. It would be best if the plumber shut off the water and cut into a few sections to see if there was obvious deterioration on the inside walls of the pipe and the fittings. Just because the pipe looks okay on the outside it may not be okay!!! It is best to get it professionally checked out.

PHOTO: This popular internet photo shows the flaking and scaling of the interior walls of the plastic elbow fitting. This fitting had not yet failed, but other portions of the system had failed. This is why we recommend an invasive evaluation to see the conditions of the interior walls of the pipe and plastic fittings.



b2ap3_thumbnail_4Types400.jpgWe usually think of polybutylene pipe as being plastic and gray in color. It does come in some other colors, such as blue, white, and black. Look at the photo to the left. It shows four different pipes above a water heater.

BLACK GAS PIPE - This pipe is used for natural gas piping.

COPPER - Copper is easy to identify due to its color and is used for water supply lines.

POLYBUTYLENE - Look at the gray piping. This home has both copper crimp rings and copper fittings. The polybutylene was used for the water softener upgrade and was only found in this one area as it spliced the added water softener into the original plumbing system.

PEX - The white pipe is white plastic PEX. Pex comes in white, blue, orange, red, and even a more translucent milky white clear. In this home they tapped off the original copper system with PEX to plumb the newly finished basement bathroom and kitchen. We know that it is not white polybutylene because of the year of installation.

All plastic piping has lettering on the outside that identifies what type of pipe it is. There may be some confusion as to whether or not it is polybutylene or PEX. PEX is the plastic piping that came about to replace the polybutylene. As a general rule you can assume that it is PEX if it any color but gray if it was installed after 1998 and polybutylene if it was installed before 1993. The five year transition period could have either piping installed .

Look closely at the photo below. You will see that the 90 degree elbows have plastic fittings. Now look at the photo to the left, you will see that the newer of the two installations uses copper elbows.



  • ALUMINUM & PLASTIC - The very first installations included aluminum crimp rings and plastic fittings. The first failures were blames on the joints and the aluminum crimp rings were really suspect.
  • COPPER & PLASTIC - The next phase included the upgraded copper crimp rings and the same plastic fittings. Failures still occurred and they then blames the plastic fittings.
  • COPPER & COPPER - The third phase dumped the plastic fittings in favor of barbed copper fittings and copper crimp rings. That resolved the leaks at the joints, but failures still occurred in the piping away from the joints. It was at that point that the plumbing industry finally admitted that this piping was not the pipe of the future.
  • MANIFOLD SYSTEMSManifoldPEX - The final phase of polybutylene piping in residential structures included manifolds. The piping composition was altered and the installation process was changed. The smaller pipes no longer were being installed with joints and crimp rings. Instead, the pipe would leave from the manifold and run non-stop carefully bending and wearing through the home to the final plumbing fixture. Each fixture had its own pipe and the only joints were at the manifold and at the fixture. All splicing in walls and concealed areas was avoided and the techniques worked much better. The newer pipe typically had either a fine red or blue stripe running the length of the pipe (See the main blog entry photo). The newer pipe and techniques worked and they are excluded from the class action settlements. Public pressure made the manufacturers realize that polybutylene was a dead horse so the industry dropped it from the residential market in favor of the newer plastic PEX (They continued to use it in mobile homes and commercial, just not in residential).
  • PEX - PEX piping is installed using all of the techniques of the final phase of polybutylene. The manifold systems and non-stop bends instead of splices are now the norm. It has not seen the failures of its predecessor and has proven reliable so far.


"Michael, do you remember when you were inspecting and you pointed out the piping in the home we were buying was Polybutylene (PB)? You told us that there had been some class action lawsuits and that it was prone to leakage. You also pointed out that our system had the copper crimp rings and the plastic fittings. Well, since we moved in we have had two separate leaks that we had to call a plumber out to repair each time. Well, it turns out that we qualified for the PB class action settlement and all of our supply plumbing was upgraded for free. Dan 1998"

The reason that polybutylene pipe is such a big deal is due to the huge damage losses from ruptured pipes. This is a very common issue in many parts of the country, however my experience is that here in Utah the failure rate is much lower than most parts of the country.

NOTE: If you are buying a home with polybutylene, you should call your prospective home insurer and see if they have any prohibitions against insuring homes with this type of piping in use. It is not uncommon to learn that you will have higher premiums, restricted coverage, and some insurers might deem the home uninsurable.


Leak1LgWith every new issue in home building comes with them the marketing fears from those who stand to profit the most. Polybutylene is no different. Here is one such popular scare tactic often found on the internet, “Failures can range in severity but once you find one leak you can be assured you will soon have more. With polybutylene it is not a question of IF you will have a failure but a question of WHEN you will have a failure.”

This is a clear case of fear mongering scare tactics to get you to re-plumb your home. It would not surprise you to learn that the phrase is readily used on many websites for firms that specialize in stripping out the old polybutylene pipe and installing new copper pipe. Whether you have galvanized, plastic PEX, copper, CPVC or polybutylene piping, leaks are inevitable. The truth about polybutylene is that it degrades quicker than the rest of the pipes on the approved piping list. And in some areas its deterioration is significantly quicker.

The class action settlements have been very clear to state that the realistic lifespan of polybutylene piping is just 15 years. Homes with systems older than 15 years are automatically excluded from the class action settlements. The 15 year lifespan is a real shocker to most home owners and prospective home buyers. When we think of copper and galvanized piping we like to think that they will last a good 50 years without major issues. I often see 100 year old galvanized piping still doing its job. Realizing that the courts have only made the manufacturers responsible for 15 years leaves many homeowners with polybutylene fearful that their systems could fail at any time. There is just no information or empirical data that can give any real real confidence to reduce the fears of polybutylene pipe.


Google is a fantastic internet research tool for residential building product failures. You must be very careful to determine the bias of the webpage authors to identify their motives for providing the information they share online.

    LAWYERS -Lawyer sponsored pages tend to excite the reader to motivate more litigation business.
    PLUMBERS - Plumbing firms apparently love to scare all homeowners into having their pipes replaced.
    CLASS ACTIONS - Class Action Settlement websites are derived from successful legal actions that end up with a limited “Pot of Gold” to help subsidize the repairs of those who have suffered damages.

There are very few information only pages with a a neutral bias because there is no money made in producing information only websites. The best that you can do is get a broad perspective by reading many pages and see if all of the information is consistent.

After performing a typical Google search for “Polybutylene Pipe Damage” it revealed immediate informational stories that all should read. There were 36,300 results from the search. Let’s look closer at the first four because they are very information packed.



PropEx is a real Estate firm based right smack dab in the middle of hundreds of PB pipe failures in North Carolina. Their bias is to educate property buyers so that the clients cannot come back later and file a lawsuit against them.



CodeCheck is an informational website geared for independent and municipal building inspectors. Their bias is that they want to sell study tools and they do a good job conveying neutral information via their website and online forum about current building and code issues. They also do a great job of responding to the regular homeowner. The specific link from the Google Search leads to a 1994 PDF article from the Arizona Water Foundation that is worthy of reading.



This is not the typical home inspector website article regarding polybutylene. They share good concise information and even allow readers to reshare the article in their own newsletters. I recommend this article to all those interested in learning more about polybutylene pipe.


Google4This top 4 Google listing was disappointing because it is a direct rehash of the article listed above. I wish that this article written especially for real estate agents would have done more than just scratch the surface. The writer‘s investigation involved going to one source and copying their information. This is a disservice to the reader.



The hundreds and thousands of homes affected by ruptured polybutylene started to clog up the courtrooms and the lawyers banded these homeowners together to go after the product manufacturers in class action suits. The settlements are now long expired and homeowners have little to no recourse in the current marketplace. Here are some of the old information links...

  • - Consumer Plumbing Recovery Center - This settlement is now closed!
  • - A copycat site that does have some links, but also has dating services. - Site is now closed!
  • - Fear driven mold and damage site. - Site is now closed!
  • - Site is now closed!
  • - PB Express plumbing firm website with good links.


    Here are some great tips from from Canada that also apply here in the US:


    • Do not use plastic piping in a continuously circulating hot water plumbing loop.
    • Do not use where water temperatures could exceed 180 degrees F.
    • Do not use in an application where the plastic pipe will be exposed to direct sunlight.
    • Do not allow pipe to be left exposed to direct sunlight for more than 30 days during or before construction.
    • Do not use acetal (plastic) fittings.
    • Water heater connections should be made with metal (copper) connectors at least 18" long.
    • Pipe must be kept at least 6 inches from hot water tank or furnace flue pipes.
    • Polybutylene piping is not suitable for swimming pool piping systems, or where more than 2ppm of chlorine (free residual) will be routinely encountered.
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