I am unaware of any and all US plumbing codes. I am from BC, Canada. I know most common practices in use in Canada today. I would expect that the codes in each of our countries would have great similarities and differances.I do know the last thing Ted said earlier is true. In Canada there is no way anyone in a home can have a shower while any other faucet is running. The change in flow would burn or freeze your ass off. Homes are designed to allow about only 2 outlets open at a steady pressure. After that the pressure drops off.I have a feeling by what everone is saying here that this pressure change is not common in the US. It seems water supply to US homes is based on the most you can get to each outlet if they were open all the time all at once.In Canada we have 98% of the worlds fresh water and our government is dead set on keeping it this way. Smaller lines are used for conservation of water and irrigation of non agricultural properties is strictly managaed in the summer.Maybe the US should look to follow California and stop using their water like it was as plentiful as air. California will have no water in the near future and they will either get it from the ocean or Canada.The proof (calculations) behind what I said last time is listed in Water and Waste Water Technology by Mark J. Hammer. This book is very indepth and I reccomend it as basic knowledge to anyone in the water or waste water business. By the way thiks book is published in the US and should be available.
