2 new bathrooms in the basement

[macheske]

Well, I'm starting to finish my basement. I just bought the house in Dec from a builder so it's all new work that I'm working with. The basement was roughed for 1 bathroom but the wife wants 2 down there. She also wants a mini-kitchen. Luckily they are all close to the existing rough in. I've done a couple other basements in the past and always put the bathrooms at the existing rough in with minor concrete demolition. I'm not worried about the supply lines since I've done this many times. I have a bunch of questions regarding the waste lines....
1. Is there an easy way to find out which way the waste lines run under the concrete (they're capped right now)? I'd like to limit how much concrete I tear up.
2. The already roughed vent is close enough that I should be able to use it for one of the bathrooms and the mini-kitchen but the other bathroom will need a new run. How do I do this?
3. Where do I find a decent book on plumbing for a project like this? What I've seen is either for someone who couldn't use a plunger or for a professional.
Thanks,
Rick

[macheske]

Also, I don't see how the tub rough in is vented. Doesn't a tub require a vent?

[macheske]

I'm including a diagram of the existing plumbing and what I think might work. Please comment....

[macheske]

Any help would be appreicated.... Especially helpfull would be:
1. Where would the vent tie into the main?
2. Which fittings to use?
3. I assume that I would use multiple 45's to get to the main rather than 90s or anything else. Is this right? How quick should I make the turns?
4. How do I determine if a vent is close enough to the trap? Including the toilet?
Thanks,
Rick

[Unregistered]

Are there existing fixtures tied to existing vents above this?? Would there be issues tying into a existing vent if say a bathroom was directly above this and already venting into this vent you are wanting to tie into?

[macheske]

The vent does not have anything tied to it at this time. It goes directly to through the roof.

[DUNBAR PLUMBER]

To question #1, I would have someone with a camera inspect the piping from the 3" piping that serves the toilet. From there they can tell where those branches come off for the shower and vanity.

To question #2, That vent serving that battery of fixtures would have to be larger than 1.5" to tie into with another bathroom and kitchen sink. If it is 2" you would be okay.



All of it can tie together at 42" on the basement level and go up as one pipe.....just as long as it ties in 42" above the highest flood level rim on the last battery of fixtures in the home.


From the way you are setting your drains in green, extending out your vents in that fashion is flat venting which is not code. You will endure a clog in this fashion....and the buildup could sit in that pipe,,,,,sealing off the vent down the road.


You must always wash your vents in a fashion that the vent never becomes obstructed during a clog and the system eventually free's up.


Easier to show than explain.


I would go on ebay and type in "plumbing". They are always selling books relative to what you are looking for, 100's to chose from.

[macheske]

Thank you for the reply!! I understand most of it. I'll see if there is a location to add a second vent all the way up to the roof. Unfortunately, the one that I have is 1 1/2 inches. I didn't understand the comment about flat venting. Could you explain? I opened up the existing toilet drain and shower drain and ran a snake down it and it's pretty much as I thought. The toilet waste runs directly to the main (in the direction that I show on the diagram) with the tub attaching to the same pipe somewhere after the toilet making a somewhat sharp (probably 2 45's) bend to it. I probably won't know more until I get the jack hammer out. Can you think of a way to do it to code with what I have?
Thanks,
Rick

[macheske]

Here is a 3D schematic of the plumbing. Unfortunately my drawing is not the best.... Any idea what to do with the 1 1/2 inch vent? Running another vent from this level (basement) to the roof looks pretty much impossible without tearing out walls. Any other comments?

[macheske]

I also have a 3" stack that used for a 1/2 bath on the first floor and a full bath on the second floor attached to it. Could I use it for a second vent? What fittings do I need to tie into it?

[macheske]

I also have one more option if I absolutely need more vent size. I had the builder run a 4" piece of pvc from the basement to the attic for later wiring if I needed it. I could use all or part of it for a vent all the way to the attic but the path would be tortorous since it's on the other side of the basement. It would have to jog up and down across the basement ceiling. Comments?

[mdshunk]

I had the builder run a 4" piece of pvc from the basement to the attic for later wiring if I needed it. I know you said you had the builder run this PVC for future wiring, but normally a piece of empty PVC from the basement to the attic is for a future radon system vent.

[macheske]

I also have a radon vent in another part of the basement that is not hooked up. The 4" pvc run that I'm talking about is one that I had added. I had it put in so that I could add coax and ethernet cable and maybe romex if I really need it. It runs right next to one of the hvac stacks. How do I determine how much vent size I need? There are 3 sinks, 2 tubs, and 2 toilets.
Thanks,
Rick