Schematics for running new water supply lines

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by justinae, Feb 15, 2012.

  1. justinae

    justinae New Member

    Messages:
    49
    Location:
    Portland, OR
    I have a very simple house, 1000 sq.ft. Water heater is going right behind the tub so I'm assuming that we'll not have to wait long for hot water for showers. I did some reading and spoke to a plumber friend about running new lines and came up with the attached pic. Basically just pulling all the 1/2" runs off the 3/4" line and keeping it 3/4" until I get to the last fixture on the line. Should I be concerned with loss of pressure when someone flushes a toilet?

    thanks!

    Attached Files:

  2. liquidplumber

    liquidplumber In the Trades

    Messages:
    69
    Location:
    Gastonia NC
    Wow... I totally dont understand that drawing...lol To answer your question, yes what the plumber friend told you will be fine. Run a 3/4 trunk line for hot and cold and pull off 1/2 to feed each fixture. at end of line use 1/2 to feed last fixture. no worries.
    Here's an easy rule of thumb 1/2 inch line feeds 1 or 2 fixtures 3/4 line feeds 3 or 4 or more.
  3. justinae

    justinae New Member

    Messages:
    49
    Location:
    Portland, OR
    :) I was wondering if it would only makes sense to me. It's a bit cluttered, but it will help me figure out what fittings I need and is just as you described.
  4. justinae

    justinae New Member

    Messages:
    49
    Location:
    Portland, OR
    So you don't think I'll have any issue with pressure when showering and someone flushes or turns on the washer?
  5. liquidplumber

    liquidplumber In the Trades

    Messages:
    69
    Location:
    Gastonia NC
    nope. it will work fine. My own personal house is a 4 bath with 3/4 trunks running throughout and 1/2 lines pulled off the trunks to each fixture. 3/4 main line from the meter at the street (also hot water recirculation). I wouldnt tell you to do something that i wouldnt do in my own home. BTW, as a new construction plumber ive plumbed thousands of new homes. the biggest being 7.5 bath 2 kitchens 2 laundry rooms. it has 1inch main from street 3/4 trunks.. 1/2 pulled off trunks to each fixture ( it also has circulation which means the house is piped in series which makes it even more difficult to control pressure drop issues) It works perfectly.
    No worries. I promise. Now about those drawing skills......lol
    Last edited: Feb 15, 2012
  6. justinae

    justinae New Member

    Messages:
    49
    Location:
    Portland, OR
    Good stuff. Yeah let's hope my plumbing skills are better than my drawing skills. :) At least I used different colors.
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