My water pipes that go to the kitchen faucet bang when the water is running, they are copper pipes and we are on a city water system. the rest of the plunbing never bangs, Thanks in advance for any help. Greg

I just finished putting together a drain in my laundry room for my washer and utility sink. I had everything cut to size and marked for fall requirements. But when I cemented the joints the fall kind of got messed up in a couple of places. The drain starts at the washer. 1. The fall ended up being more than 1/4" per foot in the first stretch. (3 feet long) 2. The second stretch has no fall. (3 feet long) 3. The third stretch again has more than 1/4" per foot of fall. This is also where the sink drain comes in. (3 feet long) 4. The fourth stretch also is flat. (2 feet long) 5. The drain connection to the floor is almost flat. (18 inches long) Will this be a problem? Do I need to do it all over again?