Poly B (polybutylene) plumbing is typically replaced with PEX (cross-linked polyethylene), copper, or occasionally CPVC. PEX is the modern industry standard due to its flexibility, affordability, and resistance to corrosion and freezing.
The best overall replacement for polybutylene (PB) pipes is PEX (cross-linked polyethylene). It is highly flexible, resistant to corrosion and chemical degradation, and costs less than the other primary alternative, copper.
Polybutylene (PB) pipe replacement is a critical home improvement project. Because polybutylene is highly prone to splitting and leaks when exposed to water oxidants and aging, plumbers strongly advise doing a complete home "re-pipe" with modern materials like PEX or copper.
PEX pipe is quickly becoming the preferred choice for homeowners looking to replace their old polybutylene piping. It offers several advantages over its predecessor(s), including durability, flexibility, and cost-effectiveness.
Yes, polybutylene (PB) pipe absolutely needs to be replaced. Widely used between the late 1970s and mid-1990s, PB pipes degrade and become brittle when exposed to oxidants and chlorine in public water supplies. Because they are prone to sudden, catastrophic ruptures, most plumbers consider it a matter of "when" they will fail, not if.
These brass transition fittings have color-coordinated collars on their ends to identify which side goes with which pipe. The gray collar of this push-to-connect transition coupling is compatible with polybutylene pipe and the tan collar end is compatible with PEX, CPVC, PE-RT, SDR-9 HDPE, and copper pipes.
Homeowners insurance typically does not cover polybutylene (PB) pipes. Insurers classify them as high-risk due to a history of defects and leaks. While some companies may offer coverage, they will generally exclude water damage, add surcharges, or require you to completely replace the plumbing system.
PEX Plumbing Pipes
Not long after polybutylene left the market, a new polyolefin was introduced—crosslinked polyethylene, commonly called PEX. Like all polyolefin materials, PEX is a ductile, flexible plastic; but it also shares the biggest weakness of polyolefin plumbing systems: chlorine.
Replacing polybutylene pipes with PEX (cross-linked polyethylene) typically costs between $4,000 and $15,000, with a national average of about $7,500. For a standard 1,500-square-foot home with two bathrooms, expect the project to land on the lower end, around $4,000 to $6,000.
Leaks and Fittings Issues
PEX plumbing uses fittings and connectors that are typically made of plastic or metal. Over time, these fittings can loosen, leading to leaks. Problems can arise with crimp rings, as improper use of a crimping tool can weaken the joints.
Legally, in most places, you're required to disclose the presence of polybutylene plumbing if you know it's there. If you don't, and the buyer finds out during inspection, it could derail the sale or lead to a price cut.
Poly's Age Problems. According to studies by Fannie Mae and HUD, domestic water supply systems in multifamily buildings reach the end of their useful life after 30–50 years.
PEX tubing has thicker walls than PB tubing.
Although both types of tubing achieved the same pressure rating of 100 psig @ 180°F (690 kPa @ 82°C), the thicker wall of PEX gives better mechanical strength and resistance to damage.
One of the most common things to look for is the gray color of the pipe. Gray pipe isn't really used anymore and plastic pipe like this. So, if you have any of this gray piping in your home, chances are you have some polybutylene.
Despite these benefits, some insurance companies have raised concerns about PEX plumbing, particularly regarding older installations: Historical issues: There were class action lawsuits against PEX manufacturers due to premature failures at connection points, resulting in leaks and flooding in some cases.
SharkBite Max polybutylene adapters are the fastest way to transition between polybutylene pipe and PEX, copper, CPVC, PE-RT or SDR-9 HDPE pipe.
Does homeowners insurance cover plumbing pipes? Typically, your homeowners insurance policy will pay for the damage that occurs from a leaking or burst pipe (as long as it's a sudden or accidental event), but it won't pay to repair the actual pipes. That's something you would have to pay for out of pocket.
PEX A pipe is generally 20% to 35% more expensive than PEX B pipe, but cheaper fittings and faster installation can offset this. Total project cost depends on your pipe diameter, connection type, and whether you are paying for professional labor or installing it yourself.
Yes, you should proactively replace polybutylene (PB) pipes, as they are prone to sudden failure and, over time, will degrade and leak due to reactions with oxidants like chlorine. Used in homes built between roughly 1978 and 1995, these pipes can cause significant, hidden water damage, making replacement advisable to avoid high repair costs and insurance issues.
Generally, you can budget around $2 to $6 per square foot for a PEX repipe. So, for a 2,000-square-foot home, you might estimate a cost between $4,000 and $12,000. You can also refine your estimate by counting your plumbing fixtures.
It's a common question, and the answer is that it depends on the insurance provider. In general, insurance companies do not provide coverage within homeowners insurance policies for polybutylene pipes. They are simply too much of a liability as they are easily damaged and will break down, burst, and damage the home.
If you have polybutylene (PB) pipes, the safest course of action is to replace them immediately. These pipes, common from 1978 to 1995, are prone to sudden failure, cracking, and leaking due to reactions with chlorine in water, often causing significant water damage.
Avoid making guesses or unsupported statements about what caused the damage to your property. Speculating can lead to inaccuracies in the adjuster's report, potentially affecting your claim.
Yes, you can buy a house with polybutylene pipes, but do not do it without negotiating a price reduction or having the seller replace the pipes prior to closing. Polybutylene (a gray or sometimes blue plastic pipe used from the late 1970s to the mid-1990s) is highly prone to sudden, catastrophic failures because oxidants in public water make the material brittle over time.