Water Supply to Detached Garage/Living Space

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by philwgreen, Apr 15, 2013.

  1. philwgreen

    philwgreen Member

    Joined:
    Apr 15, 2013
    Location:
    Dallas, TX
    Love the site and have learned so many things reading through the forum. About to start work on a garage with living space above it and wanted to get everyone's opinion on getting water out to the new building.

    Main house was built in 1949. House is one story on a hill with a walk out basement under about 1/3 of the house. The rest is crawl space. I spent some time this last week digging (always fun in a crawl space) to get a better idea of the current plumbing setup. Here's what I know.

    Main line into the house is 3/4. That line passes to the back half of the house about 18" below grade about 30'. There are 1/2" branches as it passes my kitchen (sink, ice maker), hall bath (lab, toilet shower/tub), laundry and master bath (double lav, toilet, shower). At the end of that run is the tankless water heater and the 3/4" hot line runs back to the front of the house with 1/2" branches at the same locations (master bath, laundry, hall bath and kitchen.)

    My question is two-fold.

    Our GC and plumber want to tee off the end of the cold line, near the water heater, and run 3/4" to the new structure (about 50' away). In my head it makes more sense to tee off where the 3/4" enters the house and send one side to the main house and one side to the new building. I don't have any science/facts to back up that assertion - it just seems to make more sense to me - but then again I'm not a plumber. I'm just getting the impression from the GC/Plumber that their way would be 'easier' but I don't know if it's better or correct.

    The second part of that question: is 3/4" even large enough to carry that many fixtures? The new building will have one bath (lab, toilet, shower).

    Any help/advice would be greatly appreciated.
     
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    What difference does it make whether you have a 100' line running from the front of the building, or a 100' line running through the house with some other lines, which are used occasionally, hooked to it. I would just extend the line from the existing.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. philwgreen

    philwgreen Member

    Joined:
    Apr 15, 2013
    Location:
    Dallas, TX
    Thanks hj.

    That was just it - I wasn't sure if it made any different or not. Seems like the best bet would be to extend the 3/4" line right before the water heater, right?

    Given the amount of fixtures I have - do you think a 3/4" main line is sufficient?

    Thanks again for the help.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The NUMBER of fixtures is immaterial. How many do you use at the same time? That is what is important, and usually, the answer is one, or two at the most.
     
  6. philwgreen

    philwgreen Member

    Joined:
    Apr 15, 2013
    Location:
    Dallas, TX
    You're right. No one is running the dishwasher, doing laundry and taking two showers at the same time!

    Thanks again. I appreciate the help.
     
Similar Threads: Water Supply
Forum Title Date
Plumbing Forum, Professional & DIY Advice Shower - Plumbing Moen 3/4 valves with 1/2 inch water supply Aug 23, 2015
Plumbing Forum, Professional & DIY Advice Constraints of skirted TOTO toilet - wrt to water supply outlet? Jun 17, 2015
Plumbing Forum, Professional & DIY Advice What can cause tiny plastic crumbs in my water supply? Apr 23, 2015
Plumbing Forum, Professional & DIY Advice common water supply diagram for multi level condominiums Jan 14, 2015
Plumbing Forum, Professional & DIY Advice Turn off water heater when shutting off main water supply?? Jan 11, 2015

Share This Page