Drain and vent situation

[henk]

Hi,
i have a question,
remodeling a 2 flat and the bathrooms are right above one another,
previously the total first floor was 'wetvented' to the stack (4" CI).
Now i want to redo it right.., also the kitchen sink is on the outside wall of the bathroom so i was hoping i could vent (and drain) that.
Doest this drawing look like it is ok?
i'm in chicago btw
thx
henk

 

[hj]

The way you have it drawn NOTHING, including the first floor toilet, is vented. The second floor toilet IS okay, however.

 

[Sponsor]

 

[Terry]

The way you have it drawn NOTHING, including the first floor toilet, is vented. The second floor toilet IS okay, however.

Yes, only the upstairs toilet is vented. It should be more like the drawing below

For sinks, tubs, shower and lavs, the vent is at the level of the trap arm, not below.
Vents tie together six inches above the flood level.
Wet venting is only for bathroom fixtures and only for the same floor.

 

[henk]

Thanks for the feedback Terry, I've changed my setup, it looks simpler i hope better this way..,
my question now is with the first floor toilet, can i 'tie' in the drains before, and vent it at, the main stack (with a 2"side inlet? )
(it is an old house with very little room for any thing..)

 

[Terry]

The second drawing is much better.

The first floor toilet vents before it enters the stack. What is below the first floor for space?

 

[henk]

The second drawing is much better.

The first floor toilet vents before it enters the stack. What is below the first floor for space?

The basement, about 7 ft high, about 2 ft of 4"cast iron sticking out of the slab connected to the 'horizontal' sewage, I am planning on putting a cleanout T on the CI and go straight up (it lines up with toilets) with 4"PVC.

 

[Terry]

You can run four toilets on a vertical 3"
Three toilets on 3" horizontal.

 

[henk]

Thanks again for your quick reply.
How about those horizontal runs I have, with a bathtub/shower, a kitchen sink, lavatory, would 3" be overkill,
Chicago code is pretty strict, also wondering about vent sizes...

 

[Terry]

Kitchen sink and tub in 2" with 1.5" vents and trap arms
Lav can be 1.5" and 1.5" vent.
Toilet is 3" and 2" vent.

2" handles a sink, lav and tub.