Irrigation stub out for future?

Discussion in 'Irrigation / Sprinkler Forum' started by mikha'el, Mar 24, 2021.

  1. mikha'el

    mikha'el Member

    Joined:
    Jan 27, 2015
    Location:
    Texas
    As part of my complete tear out/rebuild I thought I'd be kind to a future owner and stub out a 1" line to the exterior for a future irrigation system.
    But poking around at irrigation design sites, it looks like the contractor often just locates the incoming service out in the yard and taps in.

    Is that the norm? If so I'll save myself the bother.

    Thanks,
    Michael
     
  2. breplum

    breplum Member

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    Oct 2, 2004
    Occupation:
    Plumbing and heating contractor
    Location:
    San Francisco Bay Area
    For the front yard, yes the incoming service is typically where a tee would be located.
    For the rear, definitely stub out. 3/4" is fairly normal, but depends on what kind of system is expected, and so, sized accordingly.
     
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  4. mikha'el

    mikha'el Member

    Joined:
    Jan 27, 2015
    Location:
    Texas
    Thanks for the reply.

    The spot I'd stub to is sort of on the wrong side of the house/driveway anyway.
    Will probably just stub a 1" outside the utility service room - just in case - while I have it opened up.
     
    Last edited: Mar 25, 2021
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Remember that irrigation water should not go through a water softener. While planning, you might consider a softener or other water treatment -- even if it is just a cartridge filter.
     
  6. mikha'el

    mikha'el Member

    Joined:
    Jan 27, 2015
    Location:
    Texas
    Yes, irrigation & hose bibs will tee off ahead of the softener.
     
  7. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Where you decide to stub out for the 1" future irrigation feed, you want to tee off a 1" supply. If it is 3/4 inch in your utility room to stub out with 1", it is OK but just realized that you're not getting any more water than a 3/4" line can supply. Most irrigation valves start at 1" anyway. Running 1" pipe underground and then tee off to 3/4" or 1/2" for sprinklers will allow less water pressure lost on long runs.

    Do try to tee off before the water enters the home. It is very common that the water line has to be run under the driveway. But for irrigation all you need is power for the controller which is usually easy to do and with WiFi controllers, its location is not so critical.
     
  8. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    That's not quite right, a short segment of 3/4" in a long run of 1" doesn't throttle your output as much as doing the whole run in 3/4" would. There's an approximate conversion factor from 3/4" to 1" pipe, i.e. each foot of 3/4" pipe in the run will be equivalent to X feet of 1" pipe. The empirical Hazen Williams formula say X = (d1/d2)^4.87, where d1 and d2 are the internal diameters (assuming the same type of pipe).

    Cheers, Wayne
     
  9. mikha'el

    mikha'el Member

    Joined:
    Jan 27, 2015
    Location:
    Texas
    Stands to reason... but all that to say - there is no 3/4" involved, it's 1" copper all the way to the manifold, with a tee ahead of the softener bypass.

    My current thought (and this one might stick) is to DIY a little 1" copper x PEX manifold and run 3/4" PEX to the hose bibs on the meter side of the driveway and 1" to the other side - for future irrigation for the backyard and/or small front side yard.

    Thanks, gentlemen.:)
     
  10. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    FWIW, the same analysis applies to 1" copper vs 1" PEX. I think for new copper runs, the smoothness factor is the same as PEX, so you can again just look at the ratio of inner diameters, to the 4.87 power.

    Cheers, Wayne
     
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