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I'm trying to help out a friend. They bought an older home and in the sinks and shower when the hot and cold are used together the water pressure drops. The pressure coming into the house is 60 PSI and the water main is 3/4 or 5/8 ID the piping going to everything is 3/4 then down to 1/2 inch to the sinks etc. Would changing the piping from the water meter from 3/4 to 1 inch help. Some one suggested we change the pipe to 1 & 1/4 I think this is over kill.
Its a really bad pressure drop. There is no pressure reducing valve in the system. Also 3/4 in and out of the water heater.