Is 1/2inch pipe causing problems?
In the process of installing a pressure regulator on my main the other day, I decided to check under the house and see what was going on as we've been having really bad water hammer issues when sprinkler valves turn off, cold water in kitchen turns off, and sometimes when toilet flushes. I found that the main line comes in 3/4inches and remains so for about 10 feet under the house...then it branches off to 2 half inch lines (hot and cold) on the left and 2 to the right (bathroom and kitchen). the bathroom is a few feet away from the split. the kitchen though is about 50 feet away and that whole run is 1/2 inch. In the kitchen there is a sink, and a washing machine. Our PSI now that the regulator is on is at 60. It was at 90. We still get the water hammer.
Should I have the 3/4 inch line continuing closer to the kitchen, then branch off individual 1/2 inch lines for the washer and for the sink? Or should I bring the 3/4 inch line closer to the kitchen then keep the kitchen sink and the washing machine daisy chained as is? OR should I just leave the layout alone and maybe get a water hammer arrestor?
This water hammer issue is getting really annoying and i'm almost afraid to use the sprinklers because of the loud BANG that occurs when 2 of the 5 sprinkler valves closes. What should I do?