Bath Vent II

[mjb]

My small bath has a single 2" vent pipe for the sink only. The tub and toilet do not have a vent. I have the walls exposed at this time. I believe that the original builder did not run a vent line for the toilet because of a window that sits directly above the toilet. I am not sure why the tub is not vented. Due to the way in which the roof is structured in the attic it will be near impossible to run a new vent. The measurement from the floor to window framing is 40".

Current Drain Directional Flow:
Tub > Toilet > Sink > Main Drain

Current Venting:
Tub(no vent) > Toilet(no vent) > Sink (2" vent to roof)

It appears to me that the best way to vent the tub and toilet is under the window and then to the sink vent.

Proposed Venting: http://i160.photobucket.com/albums/t173/tact1999/dwv.jpg
1- Tub 2" vent extending 38" from floor then utilizing 90d elbow and running pipe over to toilet.
2- Toilet 2" vent extends 38" from floor then utilizes a tee connector which accepts the tub vent and allows for piping to existing 2" sink vent to
the roof.

Will this configuration work?

[Phelps]

How has the toilet flushed without a vent? And are you certain there is no vent or that they already did not do some sort of configuration like you propose?

Don't you get gurgling in the toilet and/or the water in the bowl height drops if you pull the drain plug on the tub or the sink individually, or possibly worse if you do these at the same time?

It woud strike me as odd if your toilet behaves completely like normal with no vent.

As far as what you propose, it looks good to me. All but the 2 inch size. If I can learn any more about the size issue (like from the plumbing shop I am sort of affiliated with through employer's relative) I wil let you know...unless someone else here comes up with what is code.

The way I look at it for now, is that if 2 inch is adequate, then why do they have 4 inch through roofs? (Although I have seen cases of 2 inch in attics upduced to the 4 inch as it comes through the roof.)

[mjb]

Phelps, I am doing this job for a relative. The problem is a slow draining toilet that causes gurgling sounds in the tub when the toilet is flushed. So do you believe that the height of the venting which will be 38" off the floor is sufficient? This set up will have the vent above the tub roughly 45" above the trap. in addition, the vent for the toilet should be roughly 25" above the trap. I would really like to receive a thumbs up on my proposed design and get started on this tomorrow. Thanks!!!

[Phelps]

Yes, because the run will be higher than the top of the sink. Therefore it will be dry vented.

[Fischer]

That plan should work perfectly.

[david6224]

Can the vent for a 2nd floor toilet be vented horizonally first for 7 feet along the heated floor than vertically at the outside wall? IS this okay?

[pushkins]

You cannot "vent" the toilet with a vent pipe that runs on or at the floor.

[david6224]

So, what is the proper way to vent a toilet that is 7 feet from the stack?

[pushkins]

David....The tie into the stack is the vent, if the plumbing runs from under the toilet across to the main stack then this is OK and the upper leg of the stack (that goes out the roof) will work as a correct vent

[Electrician Wannabe]

I thought there was a rule that says that you can't use the main stack as a wet vent if the fixture is more than 3 feet away.