For a main underground water line to your house, the best overall choice is PEX (cross-linked polyethylene) or HDPE (high-density polyethylene) because they are flexible, resistant to corrosion, and will not burst easily if the water freezes.
PVC. May be main gas line or pipes for water supply to the home and used for drain-waste-vent (DWV). Commonly used for irrigation systems.
PVC is going to cost less and be easier to get fittings for, PEX will be a bit easier to work with in regards to burying and gentle bends/turns (reasonably flexible). PEX is more resistant to freeze damage as well, but it's easier to recycle PVC. Basically, a lot of personal preference is involved.
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.
The best water pipe material for your home depends on whether you are doing a whole-house repipe, a DIY repair, or updating your exterior main line. The two top options are PEX for affordability and flexibility, and Copper for long-term durability and safety.
PVC is most commonly used for drain, waste, and vent lines. It is not recommended for use in potable water lines because it can leach chemicals into the water. CPVC is most commonly used for potable water lines.
Most new homes built today use PEX (cross-linked polyethylene) for their water supply lines. It has become the industry standard due to its lower cost, flexibility to snake through walls, and high resistance to bursting in freezing temperatures.
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.
PEX (cross-linked polyethylene) plumbing typically lasts between 40 and 50 years. Manufacturers often provide warranties of 25 years, but when properly installed and maintained within standard water pressure and temperature limits, the tubing itself often exceeds a half-century of use.
In plumbing, the "135-degree rule" is a code standard that dictates how much a horizontal drain pipe can bend or change direction. It limits the total cumulative angle of pipe fittings before a system requires an access point (cleanout) or must be vented, ensuring proper flow and preventing chronic clogs.
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.
While PEX (cross-linked polyethylene) pipes are flexible, cost-effective, and resistant to freezing, they have notable disadvantages. Key drawbacks include degradation from UV sunlight, susceptibility to rodent damage, chemical leaching risks, flow restrictions from inner fittings, and poor fire resistance.
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In residential plumbing, 3/4-inch pex pipes are widely used as the main water line. This size is considered the standard for many types of residential water supply systems, as it is large enough to handle water flow for standard fixtures while remaining compact.
Yes, you can absolutely use Schedule 80 PVC for water. It is a highly durable, thick-walled, pressure-rated pipe commonly used for high-pressure water systems, water mains, irrigation, and industrial applications.
Copper pipes are popular for both hot and cold water pipes because they are heat resistant, resist corrosion, and have natural anti-microbial properties. They are more expensive than plastic pipe options.
Yes, mice and other rodents can absolutely chew through PEX pipe. Because PEX is a flexible plastic, it is relatively soft compared to metal and is highly susceptible to damage from the continuously growing teeth of mice and rats.
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.
Replacing functional copper pipes is generally unnecessary, but doing so becomes highly cost-effective and practical if your copper is corroding, experiencing pinhole leaks, or if you are already doing a major renovation. PEX offers faster installation, lower material costs, and better freeze resistance.
However, recent failures and the lawsuits that have followed those failures lead to the idea that PEX plumbing systems aren't as good as once assumed. PEX systems can fail in either the pipe or in the fitting. The most notable failure occurs when the fittings fail and water starts leaking and causing visible damage.
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While PEX is highly flexible, affordable, and easy to install, it can degrade under UV light and is susceptible to rodent damage. Depending on your priorities—longevity, water purity, or structural rigidity—the primary alternatives listed below outperform PEX in specific applications.
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.
CPVC pipe, a type of plastic pipe, is rigid with thicker walls than copper. However, it won't lose heat as quickly, making it a better solution. This plastic pipe is also less rigid than copper. CPVC will expand a bit, minimizing the pressure on its walls and keeping it from bursting as quickly as copper.
Copper and PEX are the most common pipe materials used in homes. Copper pipes are durable, corrosion-resistant, and can be used for hot and cold water. PEX seems to be replacing copper pipes at a high rate since it is less expensive, more flexible, and easier to install.