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Can you tie a downspout into the footer drainage system?

Discussion in 'Residential Building Codes' started by jar546, Nov 25, 2018.

  1. jar546

    jar546 *****istrator

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    If not, can you cite the applicable IRC code?

    IMG_0081.jpg
     
  2. RJJ

    RJJ Platinum Member

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    If it drains to day light I would be ok with it.
     
    jwilly3879 likes this.
  3. Mark K

    Mark K Platinum Member

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    One possible problem would be if the perimeter drainage were to find its way into a storm water drainage system some regulations might require that it percolate through some media that would remove pollutants from the runoff.
     
  4. TheCommish

    TheCommish Sawhorse

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    hotly debated, I say no, no specific code section, what is once call common sense , footing drains are meant to relive water for the footing are and basement not to allow recharge to the soil
     
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  5. steveray

    steveray Sawhorse

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    WE have it.......(Add) R405.3 Above grade drainage. Above grade drainage systems, including but not limited
    to, gutters and downspouts, roof drains, and yard drains, shall not be connected to the foundation
    drainage system.

    Mine were in before we got this and my footing drains are a pump so there is a check valve to make sure that the roof drainage does not flood the basement....Because that is the concern WHEN they get plugged....
     
  6. Paul Sweet

    Paul Sweet Sawhorse

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    Amazingly I can't find anything in the unamended IRC that prohibits this stupidity.
     
  7. Pcinspector1

    Pcinspector1 Platinum Member

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    We will allow a drain tile from a window well to tie into the foundation drain tiles but have not seen down spouts being tied in to the tiles.

    You want the roof storm water to get away from the foundation for good storm water management.
     
  8. north star

    north star Sawhorse

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    $ ~ $ ~ $

    How will a pressure test be performed on the vertical
    pvc piping [ i.e. - water or air ] ?


    $ ~ $ ~ $
     
  9. RJJ

    RJJ Platinum Member

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    First, the footing drain has no stone on top. It should be rapped in filter fabric, not just straw. Straw when bye, bye near the end of the 80's. Now I am dating myself. The footing drain appears to be connected at the end of the foundation. If it is solid pipe from that point I see no problem. Off course it will need a place to be rodded if clogged from above grade.
    If this connection happened at the rear of the foundation I would have a problem.
     
  10. RJJ

    RJJ Platinum Member

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    North star this is thin wall pipe. It is not glued. Rain leaders on the exterior of the building are not tested.
     
  11. ADAguy

    ADAguy Sawhorse

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    foundation drains not typically sized to handle the additional volume.
     
  12. north star

    north star Sawhorse

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    $ > $

    RJJ,

    Can you please provide the Code Section or Sections
    that do not require testing of the drainage system
    [ RE: P2503.2, `15 IRC ] ?.......Is this downspout a

    DWV system ?

    Thanks !


    $ < $
     
  13. TheCommish

    TheCommish Sawhorse

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    steveray are you saying your local code add this section?
     
  14. ICE

    ICE Sawhorse

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    Is the downspout into a foundation drain something we regulate? Do we really have to explain to someone that the reason behind a foundation drain is to get water out? This ain't Texas.
     
    #14 ICE, Nov 26, 2018
    Last edited: Nov 26, 2018
  15. steveray

    steveray Sawhorse

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    You are correct Sir!......Mine is tied into the line out of the FD outside of the house and on the outside of a pump and valves....

    We amend the heck out of the Icodes, but we are trying to cut down although there is some stuff the State won't let go...
     
  16. conarb

    conarb Sawhorse

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    We do around here, the plan check has to go through Public Works, a civil engineer in Public Works makes it so difficult that you must hire a CE to design your drainage, once you have the drainage in the plans you regulate it. Historically they wanted you to divert all drainage to the curb and eventually the public storm drainage system (with the exception of the City and County of San Francisco that combines storm drainage and sanitary sewer), now thay want all drainage designed to be absorbed on the property, they then charge a large fee for all hard surface that ends up dumping in the public storm drainage system (the Last city I did one in was $1.35 a square foot). Here is a house I did with all drainage absorbed on the property.

    [​IMG]
     
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  17. tmurray

    tmurray Sawhorse

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    We do not permit it. Reasoning is that our code dictates that pipe used for foundation drainage is 100mm (4"). If you start using it for other things, then you need to provide hydraulic calculations for proper sizing (ie: engineer). most just run a solid pipe parallel with the perimeter drain.

    We see straw to prevent frost below the foundation this time of year.
     
  18. ICE

    ICE Sawhorse

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    A four inch diameter pipe can take a large volume of water. A foundation drain should see a trickle. What am I missing here?
     
  19. tmurray

    tmurray Sawhorse

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    Draining a 3000 sq ft+ impenetrable roof surface with 6 to 8 4" rainwater leaders is a lot of water for a 4" draintile to handle. Particularly when your roof is full of snow and you start to see some heavy rains and above freezing temperatures.
     
  20. RJJ

    RJJ Platinum Member

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    North Star: It is not a DWV. Do you test the rain leader?
     

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