If you are considering tackling that residential plumbing repiping project, you need to understand the different types of plastic pipe used for plumbing applications. Most plastic pipe for use by the do-it-yourselfer is actually thermoplastic.
PVC pipe is very common. It is inexpensive and easy to work with. They usual method of connecting PVC pipes and fittings is solvent welding. There are a wide variety of adapters that allow PVC to be mechanically connected to fixtures or other types of pipe. PVC is not suitable for pressurized hot water. It is an excellent choice for sprinkler systems, sewer lines, and drain pipes. PVC comes in various colors, the most common being white.
ABS pipe is similar to PVC, except that it has lower chemical resistance. It is usually black in color.
CPVC pipe is similar to PVC, but it can withstand pressurized hot water. CPVC is ideal for hot and cold water supply lines. Like PVC, it is easy to work with and is usually joined using solvent welding. CPVC pipe is usually a light tan color.
PVC and CPVC are both rigid pipes. On the other hand, polybutylene (PB) and polyethylene (PE) pipes are flexible. Like CPVC, PB pipe is suitable for use in pressurized hot water systems. Similarly, PE pipe is like PVC pipe in that it is used in cold water systems. Neither PB nor PE pipe can be solvent welded. They are joined using mechanical fittings.
Before using any type of plastic pipe, be sure that it meets local building codes. These usually specify what type of pipe is acceptable for use in different applications.
