Building Over New Drainfeild

 
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Old 11-07-2017, 11:00 AM   #1
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Building Over New Drainfeild


Just a hypothetical... what if i were building a garage with a poured slab, and i were to install a drain feild about 4 ft deep under the slab... i know this is not code anywhere, but what are the real world risks, possibilities, and probabilities?
The soil in the area gas excelent drainage.
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Old 11-07-2017, 04:51 PM   #2
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Re: Building Over New Drainfeild


Why would you even entertain such a silly notion when you've already admitted that it would violate building codes.

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Old 11-07-2017, 10:28 PM   #3
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Re: Building Over New Drainfeild


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Why would you even entertain such a silly notion when you've already admitted that it would violate building codes.
Think he was saying it's not required by code, not that it violated code.
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Old 11-07-2017, 10:52 PM   #4
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Re: Building Over New Drainfeild


No, there's no code that would allow that.

Most likely scenario is that he doesn't have the acreage to put in a legal setup.
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Old 11-07-2017, 10:54 PM   #5
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Re: Building Over New Drainfeild


Leach field? Ohhhh. Never heard it called drain field before. No, don't do that. Ever.
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Old 11-08-2017, 12:25 AM   #6
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Re: Building Over New Drainfeild


Quote:
Originally Posted by stovebolt View Post
Just a hypothetical... what if i were building a garage with a poured slab, and i were to install a drain feild about 4 ft deep under the slab... i know this is not code anywhere, but what are the real world risks, possibilities, and probabilities?
The soil in the area gas excelent drainage.


Are you asking for a friend?!?!🤣
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Old 11-08-2017, 12:47 AM   #7
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Re: Building Over New Drainfeild


Tinstaafl is pretty much right on. I know it violates all codes everywhere, and in fact, if attempted, i would take great measures to conceal it during other inspections.
Let me ask the same question in a different way...
Imagine that there are no such things as building codes. You have a lot with a house, many trees, and an easement in your way. There is just enough space in one corner to add a garage or mother in law house.... your existing septic system for the house is over 60 years old, made of concrete pipe, and under-engineered from the begining... so pretty much impossible to add to IF it could handle the increased load.
Now, thinking outside the box for your new bldg addition you think... "i could lay the drain (or leach) feild under the slab, have a small tank to the side of the building, and cleanouts several feet outside the perimeter just in case".
The weight of the building would be evenly distributed over the slab eliminating pressure points, the pipes would be deep, also decreasing pressure, and finally your not going to last 60 years anyway (current age of poorly designed septic system for your house.)
So what would the consequences or less than desirable effects be for this sort of design? (Besides codes and inspectors)
Will Hell open up and suck the house into the abyss? Or will everything probably be ok?
Also important to note: this one is not for a customer.
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Old 11-08-2017, 01:31 AM   #8
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Re: Building Over New Drainfeild


Who knows, could end up being a sh!tty situation. How about doing a vertical septic system?
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Old 11-08-2017, 05:21 AM   #9
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Re: Building Over New Drainfeild


I suspect he has already installed the septic system and now decided he wants a garage. Turns out the only area with enough room is over the new septic field.

Answer is no. As said above. A different type of septic system would have made it possible, but I believe the system is already in place.
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Old 11-08-2017, 09:56 PM   #10
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Re: Building Over New Drainfeild


is redoing the septic an option? or is there no legal alternative?
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Old 11-08-2017, 11:32 PM   #11
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Re: Building Over New Drainfeild


Well, here's the reasons it's a code violation:

1, all septic systems fail at some point, and need periodic maintenance and upkeep, but you can't do that if you don't have access to it, because it's underneath your house.

2, in order to build a structure, it is necessary to fully compact the base. This is the opposite of what you want to do over a leach field.

3, intentionally placing water underneath a house is bad idea all around, particularly pathogen-laden effluent.

I seen some pretty hacked-up stuff in my day, and I know people do some dumb stuff on there own property, but there is no excuse for doing what you're thinking of doing.




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Old 11-08-2017, 11:54 PM   #12
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Re: Building Over New Drainfeild


Every time you go into the garage.........it smells like a sewage treatment plant . Might reduce the amount of friends coming over to visit.....
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Old 11-09-2017, 08:12 AM   #13
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Re: Building Over New Drainfeild


It won't perc the way you expect. If you want something that will perc, pole barn with car decking or pole barn with crushed rock (no compaction).

Normally there is a lot of evaporation from a leach field.

I've never seen it, but I think a holding tank in that location could be legit.
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Old 11-09-2017, 11:12 AM   #14
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Re: Building Over New Drainfeild


Quote:
Originally Posted by Seven-Delta-FortyOne View Post
Well, here's the reasons it's a code violation:

1, all septic systems fail at some point, and need periodic maintenance and upkeep, but you can't do that if you don't have access to it, because it's underneath your house.

2, in order to build a structure, it is necessary to fully compact the base. This is the opposite of what you want to do over a leach field.

3, intentionally placing water underneath a house is bad idea all around, particularly pathogen-laden effluent.

I seen some pretty hacked-up stuff in my day, and I know people do some dumb stuff on there own property, but there is no excuse for doing what you're thinking of doing.




Delta

I'm with 7-Delta on this one.

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