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Rectangular hole in basement - What is it?

1739 Views 50 Replies 8 Participants Last post by  StrongEagle
Hello,

I recently moved into a new home. It is a 2-story home with a walk out, unfinished basement. The basement has roughed in plumbing for a toilet and sink. Opposite those pipes, by the stairs, there is a rectangular shaped hole filled with gravel. There is a pipe that is adjacent to the hole that goes up. This side of the basement is underground. I have run water through all the drains on the two other levels and I haven't heard water coming down this pipe. I excavated an entire bucket of gravel from the hole and haven't come across any pipes yet. Not sure if I should keep going or not.

Is this a location for a shower drain? A future location for a sump pump? The home inspection did not note any sump pumps nor did the previous owner. We have had some very heavy rains and there is no indication of water anywhere in this area. It was dry as far down as I dug. Possibly a radon vent?

I can't get plumbers to call me back for a quote to finish the bathroom and wondering if it's something I could do myself. I have zero experience in plumbing. Thanks

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So you would want something like this?
View attachment 727822
I suppose that would be fine- it's horizontal wet venting. In the OP it's an individual vent at the T/S and judging by the other vents it is plumbed correctly but much different that you image. Both are code approved (different codes have exceptions for horz venting. UPC vs IPC)
Bottom line is the OP has a T/S box that needs a solvent weld trap glue onto the existing trap arm stub- not the vent. It's all in the lingo/definitions.
 
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I suppose that would be fine- it's horizontal wet venting. In the OP it's an individual vent at the T/S and judging by the other vents it is plumbed correctly but much different that you image. Both are code approved (different codes have exceptions for horz venting. UPC vs IPC)
Bottom line is the OP has a T/S box that needs a solvent weld trap glue onto the existing trap arm stub- not the vent. It's all in the lingo/definitions.
He still might find a trap down there deep, He could measure the depth of one of the other pipes to find how deep it might be.
 

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Sorry I didn't get that in the picture. The left side of the wye goes up to another bathroom sink on the main level.
It looks like most of the drain and venting is installed and connected. You need water piping, fixtures and walls of course. The waste & vent is the most difficult.
If you are somewhat handy you can wrap this up. There enough pros and well experienced people here to help out. You can start a 'project thread' and get all the input you need (y)
 

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Discussion Starter · #30 ·
Was there any more tie in spots?
I don't know if this helps or not. The pipe on the left (where the shower will go) goes up and connects to similar sized pipes in the ceiling (behind the big pipe) and then comes down the wall on the right. Above and to the right (not pictured) there are several pipes from the laundry room and kitchen sink on the main level that seem to tie in there.

Is that what you mean?

Thanks for your patience with a newb...

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Discussion Starter · #31 ·
It looks like most of the drain and venting is installed and connected. You need water piping, fixtures and walls of course. The waste & vent is the most difficult.
If you are somewhat handy you can wrap this up. There enough pros and well experienced people here to help out. You can start a 'project thread' and get all the input you need (y)
Thank you! I appreciate it.
 

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I don't know if this helps or not. The pipe on the left (where the shower will go) goes up and connects to similar sized pipes in the ceiling (behind the big pipe) and then comes down the wall on the right. Above and to the right (not pictured) there are several pipes from the laundry room and kitchen sink on the main level that seem to tie in there.

Is that what you mean?

Thanks for your patience with a newb...

View attachment 727836
Now I'm just more confused.

Pipes on the right mostly make sense. Pipe on the left you said the kitchen sink ties into the same line that it ties into.

You had a picture of a wye (tie in) under the slab. Is that where the kitchen sink ties into?

I would not think so and presume you got mixed up.....could be me though! 🤨
 

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Now I'm just more confused.

Pipes on the right mostly make sense. Pipe on the left you said the kitchen sink ties into the same line that it ties into.

You had a picture of a wye (tie in) under the slab. Is that where the kitchen sink ties into?

I would not think so and presume you got mixed up.....could be me though! 🤨
I saw the kitchen line in a previous picture. It wyes into the 2" vertical line below the lav- totally legal. See post 23
 

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Discussion Starter · #34 ·
Now I'm just more confused.

Pipes on the right mostly make sense. Pipe on the left you said the kitchen sink ties into the same line that it ties into.

You had a picture of a wye (tie in) under the slab. Is that where the kitchen sink ties into?

I would not think so and presume you got mixed up.....could be me though! 🤨
I'm sorry. I'm sure I'm the one confused. Lots of new terminology. I also took the pictures from opposite sides which isn't clear for people not standing in the space.

The pipe on the left of the last picture goes by the rectangular hole filled with gravel. That's the only pipe I can see below the slab. I've not heard any water running down this pipe. Water from the kitchen sink and washer from the main level seems to come down the pipe on the right.

At the far back right of this picture the pipe comes from the bathroom sink on the main level.

In my attempts to explain, I think I'm making it worse. At least I know where the shower should go now.
 

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I'm sorry. I'm sure I'm the one confused. Lots of new terminology. I also took the pictures from opposite sides which isn't clear for people not standing in the space.

The pipe on the left of the last picture goes by the rectangular hole filled with gravel. That's the only pipe I can see below the slab. I've not heard any water running down this pipe. Water from the kitchen sink and washer from the main level seems to come down the pipe on the right.

At the far back right of this picture the pipe comes from the bathroom sink on the main level.

In my attempts to explain, I think I'm making it worse. At least I know where the shower should go now.
Usually they leave the pipe sticking up for the shower and they put a foam block around it with just a skim coat of concrete. So if you want or need to move it a little you can remove the foam and wiggle the pipe,
So for what ever reason they did not do that for you. Maybe they thought you might break concrete and move it anyway.
So where in the bathroom would you put the shower. I think it will connect to that pipe under the floor but you are not limited to where.
 

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Discussion Starter · #37 ·
Is the kitchen sink the farthest away in the this picture where i have marked it drain.
View attachment 727839

That is a bathroom sink immediately above that area you marked. The kitchen sink is further behind me where I stood to take the picture and seems to run to the area in the top right corner of this picture. There are a lot of pipes and water lines in that area, hot water heater, hvac, etc.

I’m assuming all those join the main line out of the house below the slab. The entire basement is concrete expect for the hole with the gravel.

thanks!
 

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The pipe by the hole is a vent and you shouldn't hear water come down it.

Now let's see where we went wrong....lol

Under the slab you took this photo. This is what I asked....where does this go?

It appears to be plumbed for a bath tub.
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Discussion Starter · #39 ·
Usually they leave the pipe sticking up for the shower and they put a foam block around it with just a skim coat of concrete. So if you want or need to move it a little you can remove the foam and wiggle the pipe,
So for what ever reason they did not do that for you. Maybe they thought you might break concrete and move it anyway.
So where in the bathroom would you put the shower. I think it will connect to that pipe under the floor but you are not limited to where.
That's a good question that I will leave to my wife to figure out (-; personally, I'd rather not have to break up more of the floor, but since it seems some of the "harder" things are already setup, maybe we can go that direction.
 

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Discussion Starter · #40 ·
The pipe by the hole is a vent and you shouldn't hear water come down it.

Now let's see where we went wrong....lol

Under the slab you took this photo. This is what I asked....where does this go?

It appears to be plumbed for a bath tub.
View attachment 727841
I'm not sure where that goes. Do I dig out around on either side to see where?
 
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