How Long Must I Wait After Gluing CPVC Pipe Before Turning the Water Back On?

Chlorinated polyvinyl chlorine pipe --- CPVC -- is a close relative of PVC, but because CPVC resists a wider range of temperatures, it's the code-mandated material for residential water supplies. Solvent-weld CPVC cement sets in minutes, but you may have to wait an hour or more before turning on the water.

Pipes, Fixtures and Shower Mixer
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Pipes and CPVC pipes next to tools and cement.

How to Glue CPVC

To increase the likelihood of a good bond, you should prime both the pipe and fitting with solvent-weld primer before applying glue; a properly primed pipe is already soft before you apply glue. Spread glue evenly on both the end of the pipe and inside of the fitting, then quickly join the pipe to the fitting by pushing them together and giving the pipe a quarter turn. Hold the pipe for 30 seconds to prevent it from slipping backward.

Curing Times

Once the glue sets, the pipes are permanently joined, but you shouldn't turn on the water until the glue cures. In temperatures from 60 to 100 degrees Fahrenheit and for pressures less than 160 pounds per square inch, the cure time for 1/2- to 1 1/4-inch pipes is 15 minutes, and for 1 1/2- to 2-inch pipes, it's 30 minutes. In colder temperatures, the safest practice is to double the curing times. You should increase the curing time by an additional 50 percent in humid weather.