I am trying to make a 2nd floor bathroom bigger by removing a wall and moving the fixtures around. I am going to tear up floor and ceiling as well.

The wall I am removing has a maint stack that goes through to the roof.

Question:

Can I reroute the Connection from the floor to the roof by going across the floor up another wall and then over to the old stack in the attic?

Whay can I do? This is our only bathroom and we want to put a tub where that old stack was?

ballengerb1

You can move the stack and use hubs and PVC or CPVC to reconnect. What is the stack made of and how long are the horizontals you will be adding? Also, can you tell if this is a wet stack or not?

GreenHornBath

Not sure if its wet or not.

It looks like 4" in the basement then goes straight up throught the roof. It's a slate roof so I can't affford to run a new vent through the slate. There is a jog in the wall where the stack is on the second floor. I want to cot it at the second floor floor and cut at the ceiling and reconnect by going across the floor up a new wall and connect back in. This would be a good illustration.

From This To This
I Vent I Vent
I I____
I I
I I
I Exist. Stack I New Stack Up new Wall
I I
I I____I Run under floor
I I
I I

Can I start Demo or is this vent going to ruin my project???

GreenHornBath

Ignore that Illustration it didn't convert well

ballengerb1

You must confirm if its wet or dry. You can do wild things with dry vents but wet stacks need 45s rather than 90s and slope needs to be considered. Have someone walk through the house using every fixture and flushing the toilets. If you hear water in the basement stack, then its wet. Back to you.

speedball1

Bal's correct! If the stack's dry then move it where you wish, however, if you have fixtures draining above the cut we will need more details. Regards, tom

GreenHornBath

The stack must be dry. There is nothing above it from the cut I am making at the 2nd floor floor joists. The pipe looks like a heavy steel 6" pipe and near the ceiling joist I see another 2" steel pipe connecting into it (probably a vent from sink or shower) I am not sure how to cut the pipe, where to cut it, and how to re-connect. Thanks.

speedball1

For soil pipes that are horizontal and on the ground we use a set of snap cutters. To make a vertical cut we use a set of ratchet cutters. Be care to not to set them up too tight or you'll crush the soil pipe. You will make your cut anywhere you can conceal the pipe on its horizontal run. If you're going to run under the floor make your cut low enough to convert to PVC using a Fernco coupling,(see image). this short piece of PVC you will prime and glue on a 90 degree elbo and that should start you on the horizontal run to the vertical. Let me know when you get there and we'll continue. Good luck, Tom