There it goes again: after it rains, the sump pump starts turning on and off, on and off. What’s worse, the pump is located right below your bedroom. The sound of the pump isn’t that bad; in fact, it’s hard to hear the nice soft, smooth hum. But when the pump turns off, the check valve closes with a “clunk” that shakes the house, over and over and over.
You can easily solve that clunk problem. First, make sure that all sources of exterior water are directed away from your foundation with proper surface grading, clean gutters, and downspout extensions. Limiting the rainwater that reaches your foundation will limit the sump pump operation.
Next, make sure that the sump pump piping is NOT securely fastened to the framing of your home. There should be a pipe hanger, a vinyl strap, or even some stiff foam to isolate the pipe from the framing. Otherwise, the framing will amplify the vibration and the sound.
Finally, replace the standard check valve with a soft-close or multi-stage check valve. These valves close slowly, eliminating the clunk. They are inexpensive and easy to install. You’ll find them at most hardware and plumbing supply stores.
