[PatrickTownie]

Hi Guys:

I want to move a 1/2 bath from next to my kitchen to a closet about 20 feet away.
I have clear access in the basement so putting the toilet and small sink in there will work nicely. Can I get away with no dry vent, as I will have to break open my celings to feed it across back to the venting stack. If I can, should I run the toilet and sink separate or connect the sink to the toilet drain as soon as I can under the floor. 3" PVC toilet sewage pipe and 2" PVC sink pipe. I can run both in separate floor joists across to the main 4" drain across the basement. I can also feed the 2" through a couple of floor joists to meet the 3" toilet sewage pipe.
Not sure if which idea would work best for wet venting.

Any help would be much appreciated...

[massplumber2008]

Hi Patrick

Check to see if mechanical vents (AAVs) are allowed in your state. If AAVs are allowed then you'll pipe the 3" pipe to the toilet and about 3-5 feet before the toilet elbow you'll roll a 3"x2"wye above the centerline of the pipe and run that over to the sink. Install the AAV (and a PTRAP) under the sink cabinet and this will effectively wet vent the toilet and vent the sink. The AAV must be installed under the sink cabinet or made accessible in some way as these AAVs can fail and need replacement.

If AAVs aren't allowed then you must still install a vent up and out the roof, OK?

Mark

[speedball1]

Another option to running the vent out the roof would be to revent (connect) back to a existing roof vent. Don't forget to invert ( turn upside down) the tee and give slope back to the fixture, Good luck, Tom

[PatrickTownie]

Thanks Guys, that was what I thought.
I'm in Massachusetts so they don't allow any AAV's.

Now I have to explain to my wife why I have to make a bunch of holes in the ceiling and walls to connect to the existing vent across the room...

I have to say I've learned so much about venting reading your answers to other's questions... Its all pretty cool...

Thanks again;

Patrick from Mass