Drain Traps in basement ceiling ???

[Phillylandlord]

My daughter just purchased a small house in the Poconos that has a septic system, The drain traps for kitchen, bath and laundry are located in the ceiling of the basement below the floor joists , I have never seen this setup before. Can this be right? I thought drain traps need to be near the drains, Thanks

[WAYNE3298]

It is preferable to have the drain traps as close to the fixture as possible, but they will work well downstream as long as there are no pockets upstream. This answer assumes they include cleanouts. Some installs simply trap water to prevent gasses from entering the occupied space. I wouldn't do that but have seen it done.

[Poodle Head Mikey]

I am not a plumber but I thought I remembered something about S-traps being at least frowned on - and perhaps banned.

So . . . to go straight down - rather than into a wall and then down - the P-trap would have to be under the floor.

Are the basement traps P-traps?

PHM
--------

My daughter just purchased a small house in the Poconos that has a septic system, The drain traps for kitchen, bath and laundry are located in the ceiling of the basement below the floor joists , I have never seen this setup before. Can this be right? I thought drain traps need to be near the drains, Thanks

[chander]

I am not a plumber but I thought I remembered something about S-traps being at least frowned on - and perhaps banned.

So . . . to go straight down - rather than into a wall and then down - the P-trap would have to be under the floor.

Are the basement traps P-traps?

PHM
--------

I have heard similar stories that water flow will flush the water out of the trap leaving it open to sewer gasses when using S-traps.

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[Poodle Head Mikey]

Double back-to-back 90's in a drain line will also do it - and so are prohibited.

[WAYNE3298]

Siphoning the trap is velocity dependent and how full the pipe is.

[plumbingdoctor]

can you estimate the distance between the drains trap?

[madhat]

Is there an Air Valve “Bladder,” where the sewage goes out to the Septic Tank? As I’ve seen that in Upstate New York, Summer Cabins. All the traps have drains, for Freeze-Burst Drainage protection. BTW There will be a huge bulge in the pipe, where the Air Valve is located.

[Stuart2]

You can see a lot of properties like that in older homes. Most of the places you see are for showers or bathtubs. They still sell them and install them. It’s a way to clean out the stopped up drains and most have unions to take apart. P-traps under sinks are what you see, but I installed new plumbing and installed the 2” traps on the drain for a shower and bathtub because its nice to have if you drop something down the drain as well as keeping sewer gases from coming up through the plumbing main drain line.


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