In the middle of a rock hanging job, I noticed the water supply lines running across the ceiling visually and confirmed mechanically slope downward from the source before running up to the first floor. I have too much conscience to continue with the job if it is incorrect. I wonder if this explains the loudest water hammer I have ever heard in a home. By the way, this ” HOUSE ” is five months old.
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FYI, Supply pipes are supported every 8 feet.
There is no reason that water supply lines can't slope a little bit here and there. It can be a real pain if you are trying to drain them for the winter, or to do some remodeling. Otherwise, as long as they are well supported it is not a problem.
I support copper pipe every four feet. It's very easy to do with the right hangers.
Thank-you for the input, One of the biggest peeves I have discovered is the water lines feeding the kitchen sink above are only supported by right angles sweated in the kitchen cabinet. It didn't seem right, and is troubling, but I am not a plumber and prefer calling in an experienced tradesperson over risking a clients safety and home.
A plumbing supply house with have several types of pipe hangers and clamps. They are easy to install and if you can hang rock you can hang pipe too. Do not use dissimilar metals--there are copper hangers for copper pipe, or use the plastic ones. Do not use metal hangers on plastic pipe. Do not stress the pipe by putting pressure on it with the hanger. Other than that.... it's a piece 'o cake.