In 1975, residential plumbing was in a major transitional phase. Copper was the gold standard for indoor water lines, while homes also began seeing the introduction of flexible polybutylene. Cast iron and galvanized steel were used for drain and waste lines, though PVC and ABS plastics were quickly gaining popularity.
Polybutylene Pipes
A popular choice for plumbing in the 1970s and 1980s, polybutylene was sold as a cost-effective alternative to copper pipes. However, the pipes degrade when exposed to chlorine, a common water disinfectant, and are prone to leaks, ruptures, and sudden failures.
The easiest way to tell PEX from PVC is by their flexibility and color. PEX is a highly flexible, rubber-like tubing that usually comes in red, blue, or white. PVC is a rigid, hard white (or sometimes cream-colored) pipe that cannot be bent and requires glued fittings to turn corners.
The production and installation of polybutylene (PB) pipes were phased out in the mid-1990s, with manufacturing officially ceasing nationwide in 1995.
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.
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.
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.
To quickly identify polybutylene pipes in your home, check the main water supply lines for flexible, gray plastic tubing stamped with the code PB2110. You can easily spot these in unfinished areas like basements, around your water heater, or under your kitchen and bathroom sinks.
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.
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.
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.
Effects on Metal and PVC Pipes
While harmless for most metal and PVC pipes, prolonged exposure to the acidic nature of vinegar might corrode certain metals, like copper. PVC pipes, on the other hand, can withstand these substances without damage.
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.
Water lines were copper and galvanized steel pretty much universally until the early 1970's. Starting in the mid 1970's, They put in a lot of PolyB which we all know the history of. Most of the underground pipe outside of the house was PVC. Inside they used a lot of CPVC.
PMRs for malignancies of the stomach, kidney, brain, and lymphopoietic system were also elevated, especially among plumbers. Chronic rheumatic heart disease, emphysema, liver cirrhosis, and all external causes of death were the major non-cancer causes with significantly elevated PMRs.
In the 1800s, most people wiped using whatever free, accessible materials were closest at hand, which typically included dried corn cobs, old rags, leaves, and moss. As printed materials became widely available, pages from newspapers, magazines, and the Farmers' Almanac were commonly hung in outhouses for both reading and wiping.
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.
SharkBite Max polybutylene adapters are the fastest way to transition between polybutylene pipe and PEX, copper, CPVC, PE-RT or SDR-9 HDPE pipe.
3 Plumbing Pipe Materials You Don't Want In Your Home
The "purple stuff" plumbers use is purple primer. It is a chemical solvent used to clean and soften the surface of PVC and CPVC pipes before applying pipe glue (solvent cement). The bright purple dye provides visible proof to building inspectors that the required primer was used.
Look for markings or labeling on the pipe
Looking at the marking is one of the easiest ways to identify PEX pipes since most manufacturers label them for this purpose. Usually, there are markings/printing on the exterior of PEX tubing that clearly says “PEX A” or “PEX B,” indicating the type of PEX tubing you have.
Polybutylene pipes are usually gray, but they can also be blue, black, or sometimes silver. The pipe has a smooth, flexible plastic feel – much more flexible than rigid copper or PVC.
PB has the same outside diameter as PEX of the same nominal size, but outside diameters differ slightly between the tubing types. This means that you should not use PEX fittings on polybutylene, but that you can use PEX crimping rings and PEX crimping tools on barbed PB connections.
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.
For a 2,000 sq ft home: New construction plumbing: $8,000 – $20,000. PEX repipe: $6,000 – $12,000. Copper repipe: $8,000 – $20,000.