Anyone use an angle finder to check for 1/4" per foot slope?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by JoshRountree, Aug 30, 2011.

  1. JoshRountree

    JoshRountree New Member

    Messages:
    32
    Location:
    Fleetwood, NC
    Seems to me it would be way easier to check it with an angle finder instead of a 1" block attached to a 4 ft. level? A 1/4" block attached to a 1 foot level would work too, but the angle finder seems so easy?
  2. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

    Messages:
    679
    Location:
    Houston, Texas, United States
    Plumbers are trained to use their torpedo levels and just crack the bubble !

    In 30 plus years have never failed a inspection yet
  3. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,386
    Location:
    Yakima WA
    Another way would be to use a line level. That is a level with hooks on each end that hook over a stout cord. Drive stakes at each end of the run and measure the distance of the run. This will tell you how much fall is needed for that section. Now stretch the cord from one stake to the next with the high end on top of the beginning point When level is located, tie the cord off and measure down the stake the distance you have determined is needed for the slope.
  4. mrmedic

    mrmedic Junior Member

    Messages:
    57
    Location:
    Delaware
    On most torpedo levels the is a second line which is 1/4" slope.
  5. hj

    hj Moderator & Master Plumber Staff Member

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    27,048
    Location:
    Cave Creek, Arizona
    What is your definition of an "angle finder"? There are many types of "slope/pitchlevels" to give pipes the proper grade.
  6. JoshRountree

    JoshRountree New Member

    Messages:
    32
    Location:
    Fleetwood, NC
    http://www.digipas.com/DWL-280 Specs.html



    anything to put on top of a pipe to see what angle it is.

    BTW, the angle in degrees that I came up with for 1/4" per foot is 1.19348942 degrees, can anyone confirm or deny if that is right?

    You'd just plop the digital level on the pipe, look for 1.19 degrees and you're good! The only drawback is it's hard to find one with a degree of accuracy better than 0.2, I'm sure it'd be at least as accurate as a 4 foot bubble level?
    Last edited by a moderator: Oct 25, 2014
  7. jadziedzic

    jadziedzic Member

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    96
    Location:
    New Hampshire
    Last edited by a moderator: Aug 31, 2011
  8. Terry

    Terry Administrator Staff Member

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    15,298
    Location:
    Bothell, Washington
    1/4" per foot is 2.0833 percent
    .25 / 12.0
    Code books say 2%

    That looks like a nice level though.
    I'm used to using a simple level and just looking at the bubble.
    They last for years and years and don't need battery changes. But gadgets are cool too.
    Last edited: Aug 31, 2011
  9. JoshRountree

    JoshRountree New Member

    Messages:
    32
    Location:
    Fleetwood, NC
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,048
    Location:
    Cave Creek, Arizona
    IF you are working with plastic pipe, it is seldom "straight", so your digital level or angle finder is only going to measure the grade of a 12" section of pipe, unless you "slide" it along the ENTIRE length of the pipe. A 4' level distributes the inaccuracy over a longer distance and is thereform more accurate.
  11. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,157
    Location:
    NW Ontario, Canada
    When I designed and built my house, I calculated the slope along with all the drops I needed for turned elbows etc. working backwards from the septic field and then worked off the drawings measuring to the level structure. The torpedo level was used more for confirmation. I calibrated the torpedo level by placing it on top of the 4 foot level.
  12. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,048
    Location:
    Cave Creek, Arizona
    In"commercial" work, I use a transit to set grades, but few homes need that accuracy.
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