I read the early May messages about water hammering. Is there anything that is different if the problem is that the pipes hammer not only when they are shut off, but sometimes about 10 seconds after they are shut off, AND sometimes when they are turned on, too? They hammer almost every time the water is run, it does not matter where in the house. I can see the cold water pipe vibrate. The problem also has come and gone throughout the last two years! Just looking to see if I can get some more specific information before I start rolling up my sleeves or calling for help. Thanks.