Copper Pipe Branching Size

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Climber, Jan 13, 2006.

  1. Climber

    Climber New Member

    Messages:
    22
    Location:
    Columbus, Ohio
    I am about to repipe my entire 3 story home with new copper pipe. I plan on coming off the meter with 1 in. pipe (presently 1 in. iron to meter and 3/4 supply at appx. 50 psi). The 2nd and 3rd floor bathrooms will be using the same branch which is seperate from all other branches. Also I plan on using a seperate 3/4 in. branch coming off the hard water line for all the toilets in the home thinking this would create less of a "shock" if a toilet is flushed and water is being used elsewhere (besides isn't it a waste to use filtered and soft water for a toilet?). Should I continue to run 1 in. pipes from the basement to the 2nd and 3rd floor, or should I run 1 in. pipes to the 2nd floor and then 3/4 in. to the 3rd floor. Or is it sufficient to use 3/4 in. pipes from the point of exit from the basement all the way up? The 2nd and 3rd floor branch conveniently runs within 1 ft. of the 2nd floor bathroom and terminates into the 3rd floor bathroom. I will run 3/4 in. pipes to within 2 ft. of each fixture. Distance from meter to 3rd floor termination is 65 ft.
    Thanks for any suggestions!
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,831
    Location:
    Cave Creek, Arizona
    pipes

    In most cases 3/4" is adequate, but we would have to see your particular application to determine if there is something that would require a larger pipe. If you use "raw" water for the toilets you may have mineral buildup and staining problems with them, depending on the water's quality and composition. You do not want to use the treated water for your outside faucets however. And using a 3/4" pipe for the toilets has no benefits.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,124
    Location:
    Bothell, Washington
  4. Climber

    Climber New Member

    Messages:
    22
    Location:
    Columbus, Ohio
    Thank you both very much for the input!
    I'll use 3/4 going up to the bathrooms. As my dad sometimes tells me, I overengineer things. Also I don't think I'll have problems with using "raw" water for the toilets; the 20 year old toilets that were here when I moved in showed no signs of staining or crustiness before I added the softener. Our iron content is nil and hardness is at 121 ppm.
  5. Cass

    Cass Plumber

    Messages:
    5,980
    Location:
    Ohio
    Remember the more 3/4" copper you use the more heat it will draw from the water.
    Last edited: Jan 15, 2006
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