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  1. #1
    Scot Merrick's Avatar
    Scot Merrick Guest

    Default septic drain field inspection

    I need to have an official inspection of my gravity drainfield. I live in King County, WA (Vashon Island) and have the ends of the drains (2) exposed. I am told that the inspector will observe how long it takes for the drain effluent at the pipe end to "go down." Is there a specific number for this?

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  2. #2
    RANDY NICHOLAS's Avatar
    RANDY NICHOLAS Guest

    Default Re: septic drain field inspection

    "specific number"??

    Yes, watered down #2.


  3. #3
    James Duffin's Avatar
    James Duffin Guest

    Default Re: septic drain field inspection

    Do you have the tail ends of your drain field lines uncovered?


  4. #4
    Join Date
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    Default Re: septic drain field inspection

    Quote Originally Posted by Scot Merrick View Post
    I am told that the inspector will observe how long it takes for the drain effluent at the pipe end to "go down." Is there a specific number for this?

    I believe you are probably talking about checking the percolation ability of the soil, i.e., a "perc test' - I've never heard of checking it that way.

    There are several ways to inspect a septic system, and the people you should be checking with are septic tank contractors (we have one or two here, or they used to be septic tank contractors).

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5

    Default Vent Requirement

    A new thread...
    Frequently new buildings have only one vent through the roof and the connections to it are sometimes very far. Recently I looked at a townhome that had over 18 feet of travel through the waste line before it connected to the main stack and the vent. The line was a 2 inch line for a shower and tub and I wrote it up as too far. The old rule of thumb was the diameter of the pipe at 1/4 inch per foot of travel or in this case 8 feet max. I realize this is just a rule of thumb but can anyone provide the code requirement for venting?

    Jeff Zehnder - Home Inspector, Raleigh, NC
    http://www.jjeffzehnder.com/
    http://carolinahomeinspections.com/

  6. #6
    Join Date
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    Default Re: septic drain field inspection

    Jeff if would have been better to have started a new thread

    I think this is what you are looking for.

    from the 2006 IRC

    P3104.2 Grade.
    Vent and branch vent pipes shall be graded,
    connected and supported to allow moisture and condensate to

    drain back to the soil or waste pipe by gravity.


    Last edited by Rick Cantrell; 09-07-2010 at 06:58 AM.
    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  7. #7

    Default Re: septic drain field inspection

    Rick,

    I appreciate your reply but I must have not worded my question correctly. What I am attempting to do is find the requirement for venting with respect to a drain line that is 2 inches by 18 long before it connects with the main stack that is vented?

    Jeff Zehnder - Home Inspector, Raleigh, NC
    http://www.jjeffzehnder.com/
    http://carolinahomeinspections.com/

  8. #8
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    Default Re: septic drain field inspection

    Quote Originally Posted by Jeff Zehnder View Post
    Rick,

    I appreciate your reply but I must have not worded my question correctly. What I am attempting to do is find the requirement for venting with respect to a drain line that is 2 inches by 18 long before it connects with the main stack that is vented?
    Jeff Zehnder,

    Please begin a new thread, don't hijack another with a completely different topic question!

    You're not going to see a new thread/new post/POST button on the "today's posts" or "new posts" or similar searches, you NEED to navigate to a forum topic list to see the NEW POST/topic links, and be signed/logged in already (refresh screen if viewed before logging in and your browser not set to do so).

    To do so, first navigate to the forum/topic area you wish to create your post in, such as Technical areas, PLUMBING, This will bring you to a LIST of present topics, scroll to the bottom of the first page of the list of posts and at the left you will see a "NEW POST" or "POST" clickable link button. Use it to create your new topic thread, don't forget to title it.

    Since your instant is a plumbing question, go here (clickable link): http://www.inspectionnews.net/home_i...al-inspection/

    Scroll down nearly to the bottom of the page, above the display options "box" and below the last listed post on the first page of the display towards the left, see the "New Thread" link (may change to large character "Post" as you view it) link "button"??????? Use IT (click on it).

    I don't wish to reward your having ignored that request by another, but get your terms straight, explore fixture branch plumbing, auxiliary venting, circuit venting, and trap arms, venting. Six inches above highest flood rim a vent circuit can join main vent stack. See Chapter 9 IPC (unammended IRC plumbing chapters are IPC based) for methods to vent fixtures (presuming that is the code for your area) or consult a plumber.

    You might also see the following article to get you started on some of the basics.

    http://media.iccsafe.org/news/eNews/...G022610PT1.pdf

    Note NC ammendments, esp. Ch. 9, several of which are specific and applicable to your townhome scenerio http://www.ncdoi.com/OSFM/Engineerin...amendments.pdf

    Last edited by H.G. Watson, Sr.; 09-07-2010 at 10:24 AM.

  9. #9
    Join Date
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    26,250

    Default Re: septic drain field inspection

    Quote Originally Posted by Jeff Zehnder View Post
    Recently I looked at a townhome that had over 18 feet of travel through the waste line before it connected to the main stack and the vent. The line was a 2 inch line for a shower and tub and I wrote it up as too far. The old rule of thumb was the diameter of the pipe at 1/4 inch per foot of travel or in this case 8 feet max. I realize this is just a rule of thumb but can anyone provide the code requirement for venting?
    Quote Originally Posted by Rick Cantrell View Post
    Jeff if would have been better to have started a new thread
    Jeff,

    This is what you are looking for, Tables do not copy and past, so here is the data:
    TABLE P3105.1

    MAXIMUM DISTANCE OF FIXTURE TRAP FROM VENT
    SIZE OF TRAP (inches) / SLOPE (inches per foot) / DISTANCE FROM TRAP (feet)
    1-1/4 inches / 1/4 per foot / 5 feet
    1-1/2 inches / 1/4 per foot / 6 feet
    2 inches / 1/4 per foot / 8 feet
    3 inches / 1/8 per foot / 12 feet
    4 inches / 1/8 per foot / 16 feet

    A 2" pipe running 18 feet to a vent is (as you suspected) TOO FAR.

    What the above is based on is this: Take a piece of pipe and hold it horizontally, have a friend look down through the pipe and out the open end; now slowly raise the far of the pipe from where your friend is looking into the pipe, when he can no longer see through the pipe ... the pipe is too long between the trap and the vent.


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    Jerry Peck, Construction / Litigation Consultant
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    www.AskCodeMan.com

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