banging pipes

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    • #285532
      Avatar photoWalter Dubyna

        Whenever we run the hot water in the bathroom, there is a repeated banging noise coming from somewhere up above the ceiling. (Were on the top floor of a 1940s fourplex, condo building) The banging will slow down as the water continues to run. Any ideas?

      • #303057
        Avatar photoE.J. Petrin

          E.J….from your discription, it sounds to me like thermal expansion of the hot water pipe when it is first turned on. The piping in the space above the ceiling, is binding in straps that are ment to hold it in place, when the hot water flowing through it causes it to increase in length (expansion). As this expansion occurs the pipe jerks and stops then jerks and stops again and again till it reaches its full extension. As it cools down it contracts much more slowly, and makes little or no noise. New pipe clamps are available that have a lubricating effect as the pipe slips back and forth and during each heating and cooling cycle, and effectively reduces or elliminates the noise problem.Bud. Happy New Year. Suncoast Plumbing.. Sunny Florida..

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