A friend has mentioned that the knocking in her water pipes is getting worse all the time. What is the cause, and is there a remedy to this?
Good solution, but since the problem has apparently only recently started and is getting worse I would try shutting off the water, draining the system and turning the water back on. Quite possible that there are already dampers in the system that have just gotten full of water. (At least it costs nothing more than a little time to try)Locate a horizontal pipe close to the problem. Cut this horizontal pipe to install an air cushion. Install a vertical section of pipe about 6" to 8" tall at this place and cap the end. This gives you an air cushion permanently in the pipe that allows the water force to put pressure against the air trapped inside the short vertical stub and not cause the whole pipe to rattle.