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Old 06-19-2011, 02:25 AM   #1
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Adding a tub/shower to basement bathroom?


As far as adding plumbing for a basement shower goes, this is probably one of the easier jobs. The drain will be located roughly 2.5' from a 2'x2' framed hole in the concrete where plumbing enters/exits the home (pics will follow) and the plumbing wall backs the boiler room.

Current bathroom is half bath and is 4" shy of 5' wide. I added a crude drawing of the floor plan. I plan to take down existing bathroom walls due to the shortcuts taken (2x2s with a 1x4 sill plate, centers anywhere from 14"-26... wow). I can't move the plumbing wall and don't want to take space away from the bedroom, hence the small jog in the wall to fit a 5' tub.

I understand I will be cutting and/or chipping out concrete.

The question is, what do I do for a trap? I am correct in understanding you frame out a 1'x1' box for it then fill it with gravel?

Anything tips for connecting this to the main plumbing?

Thanks!
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Old 06-19-2011, 06:39 AM   #2
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Adding a tub/shower to basement bathroom?


A couple of questions---is the existing drain set going into the pit in the drawing?

If so is the pit properly vented.

Are the drains PVc or iron?

Are you using a standard shower pan?---Mike---

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Old 06-19-2011, 07:11 AM   #3
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Adding a tub/shower to basement bathroom?


Is the existing drain set going into the pit in the drawing?

- Going off memory I believe so, will looked into and post pictures.

If so is the pit properly vented.

- I don't believe the pit is, but I think there is a vent going straight up from the sink.

Are the drains PVc or iron?

- PVC

Are you using a standard shower pan?

- Standard tub with surround
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Old 06-19-2011, 07:23 AM   #4
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Adding a tub/shower to basement bathroom?


If that pit is a sewage pit--and has a vent---the job may be as simple as adding a 2" drain from the shower to the pit---with the appropriate P-trap.

Do check.---Mike---
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Old 06-19-2011, 07:27 AM   #5
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Adding a tub/shower to basement bathroom?


Am I correct with the framed hole and P trap covered with gravel?
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Old 06-19-2011, 08:56 AM   #6
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Adding a tub/shower to basement bathroom?


Yes. When the pan is set masons mortar will be placed under the pan (and over that gravel) to keep the bottom of the pan from flexing.
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Old 06-19-2011, 09:47 AM   #7
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Adding a tub/shower to basement bathroom?


Pics...
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Old 06-19-2011, 09:59 AM   #8
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Adding a tub/shower to basement bathroom?


I put the electrical box roughly where I figure the drain will go. It's a bad angle but you can see the sink plumbing and vent to the far right in the picture of my water softener. The vent doesn't go straight up, it goes across the roof and ties into the plumbing going to the top floor (split level house). It's hard/impossible to tell exactly how that toilet/sink tie into the drain without chipping out all the concrete. It's no doubt it ties in around there... just not sure if it's directly under where i want my P-trap to go.
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Old 06-19-2011, 11:33 AM   #9
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Adding a tub/shower to basement bathroom?


You are going to have to cut into the drain pipes for that---I thought the 'pit' in the picture was a sewage pit with a pump. You will need to measure the distance from your new shower drain to the nearest plumbing vent on that line of drains.

If the vent is more than 5 feet,an additional vent will be needed for the shower.---Mike---
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Old 06-19-2011, 12:19 PM   #10
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Adding a tub/shower to basement bathroom?


Quote:
Originally Posted by oh'mike
You are going to have to cut into the drain pipes for that---I thought the 'pit' in the picture was a sewage pit with a pump. You will need to measure the distance from your new shower drain to the nearest plumbing vent on that line of drains.

If the vent is more than 5 feet,an additional vent will be needed for the shower.---Mike---
How about good news... You have any of that? Haha...

I'm sure it's way past 5', probably closer to 20ft of lateral travel.
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Old 06-19-2011, 12:21 PM   #11
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Adding a tub/shower to basement bathroom?


Probably only 5' before it's 'dry pipe', but it still goes laterally another 15' or so. Does it matter if it's a dry vent, but it's not straight vertical?
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Old 06-19-2011, 12:59 PM   #12
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Adding a tub/shower to basement bathroom?


Different terminology---There should be a vent pipe rising out of the floor (2") behind the toilet.

That is the vent I'm talking about.

As to cutting into the main drain in the floor that's a good thing --as long as the existing piping is not in the way of locating the shower drain.---Mike---
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Old 06-19-2011, 05:31 PM   #13
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Adding a tub/shower to basement bathroom?


I am 100% making up my own terminology... But trying to get across a thought. The vent for that sink/toilet doesn't go straight up, but i do believe it is just a vent.
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Old 06-19-2011, 06:31 PM   #14
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Adding a tub/shower to basement bathroom?


That's the vent----sorry,I was looking for a white pipe.

You will need one like that for the shower also. 2" for the drain and 1 1/2" for the vent.

Vent can be tied into the other vent.---Mike----
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Old 06-19-2011, 07:08 PM   #15
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Adding a tub/shower to basement bathroom?


Sorry, I messed that up... ABS, not PVC.

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