Copper piping for plumbing. Are 1/2 dia pipes acceptable or should a plumber know to use 3/4in dia copper pipe?
3/4 inch is used as trunk You can feed 2 fixtures from a 1/2 line that feeds off the trunk line. You can't feed the entire house off 1/2 piping.
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Water piping is sized by taking a several factors into consideration: 1) the available water pressure 2) distance 3) the number of fixture units it's supplying With that information you can look up the correct pipe size in a plumbing codebook.
My house is very large with lots of plumbing. while the main feed in to the meter is 1, some 3/4 branches out but most of the entire home is 1/2 copper pipe. As long as everyone doesn't try to use the appliances, basins, toilets, and showers at one time, there is no problem. Not even 3/4 could handle significant load unless you have terrific water pressure, and the meter usually acts a bit as a reducer for that. All plumbers would know the correct uses of both 1/2 and 3/4 inch copper pipe. If you are having problems after work being done, there are always possibilities that there is blockage somewhere in the line, or somehow the 1/2 became kinked at some point, thus reducing the pressure and flow. I would not be afraid to use 1/2 in most of any new place. However, one should consider the newest, which is PEX. This is flexible, does not require soldered fittings and joints, but depends on internal fittings that look sort of like tapered brass joints. PEX is cheaper and easier to work with, bends as long as you have some space to do it with;if you don't the plumber places an L fitting and makes a true right angle with it. Some of the L's have shutoff valves. I recently saw a house that had a PEX panel in it. From there, you could shut off the water supply to any part of the house simply by turning the valve to closed. The panel looked like an electrical panel, only it had at least twelve PEX lines running out of it. PEX comes in lighter grade for lesser loads and heavier grades for larger loads. It looks like a hard shelled garden hose. Less than 1/2 the cost of copper piping and goes in faster. Requires a special drill type fitting to expand the ends so they will snug onto the fittings. Really neat stuff. Will withstand temps better than copper, too.
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