CPVC Pipe Installation Tips From a Professional Plumber


CPVC pipe is used in domestic hot and cold water supply lines. It can also be used in some industrial liquid applications. This means you’re as likely to work with it replacing your leaking sink pipes as working in a manufacturing facility. Here are a few CPVC pipe installation tips from a professional plumber.

Use the Right Solvents

One of the benefits of CPVC pipe is that the pipes and CPVC fittings can be slid together and essentially glued in place by solvents. The problems arise when you use the wrong solvents. A common mistake is using PVC pipe solvent on CPVC pipe fittings and fixtures. In fact, you can create long-term problems by using a PVC pipe solvent on CPVC pipe even if connecting it to a fitting made to connect both PVC and CPVC pipe. Use the right solvent for the pipe it is being applied to.

Don’t Use Too Much Glue

A common mistake is using too much glue or solvent when assembling CPVC pipe. When you use too much, it may be pushed out of the joints and into the pipe’s inner surface. Now you’ve created a point on which scaling can form or a substance that may break off and flow downstream with the drinking water. Use too much solvent, and you could even get the pipe to dissolve at that point and cause a failure. The better choice is to carefully spread out the solvent so that you get an even seal.

Use the Right Tools

CPVC pipe can be cut with a ratchet-type hacksaw. However, it would be better to use a CPVC cutter. This can leave a slightly rough edge to the pipe. Don’t try to smooth it with a metal file. Instead, use sandpaper. This minimizes the stress on the exposed portion of pipe as well as the risk shards of plastic will break off later.

Strap It Correctly

When CPVC pipe is being installed, it should be strapped every four inches when laid horizontally. When you’re running the pipe vertically, do so at least once. Only use plastic assistance hooks. Furthermore, use hooks that hold the pipe a little away from the wood support beams so that sweating of the pipes doesn’t lead to rotting of the wood supports. The CPVC pipe expands and contracts, though not as much as metal pipe, and that extra space will also minimize the noises relayed through the structure of the building. Don’t forget to secure hose faucets, as well. Furthermore, the CPVC pipes should be at least a foot or 0.30 meters from heat sources like vents and lights.

Understand the Sizing Systems

CPVC pipe is often found in copper tube sizes (CTS) and nominal pipe sizes (NPS). Understand that similar pipe sizes are not necessarily the same size. For example, Schedule 40 CPVC is not exactly the same as CTS SDR 11 pipes, though they are similar in pressure ratings and temperature ratings. Others mistake inner and outer diameter dimensions, so they buy pipe they think will mate but it ends up being able to fit inside of the other pipe.

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