NewPlumbingStudent
New Member
I have tried to search for an answer to this question, both here and on Google, but I am not able to find a definition answer to what I am trying to do, but perhaps I am not understanding the terminology correctly. I am trying to pipe a new second floor addition which will add 3 more bathrooms. A rough-in diagram is attached based on what I am thinking to pipe. The main problems I am facing are
1. Venting of the water heater.
2. The bathroom on the top left-hand corner which is very far from the main stack which is sitting close to the right-hand side (the thickest vertical line on the right).
The 3 bathrooms and kitchen should all be fine because the furthest fixture is still within 10ft of the main stack, so the worst case, as far as I can tell, is that I will use a 4in PVC pipe to connect to the main stack, both top for vent and bottom for drain.
Regarding venting of the water heater. The location of it remains the same, but since there is currently no second floor (not even attic), the existing vent goes up directly and out of roof. One option is to continue to extend the same pipe going through second floor, attic, and out of roof, but this will go through the bathroom directly above in the middle. Can I use 2 90-degree PVC elbows to bring the vent into the wall, go all the way up to attic, another 2 90-degree elbows to bring the pipe inside, and then go straight up out of roof? Or potentially is there another way to tie this into the main venting/drain stack system so I don’t need to have another hole on roof? Either utilizing the newly added attic space or through walls/joists?
Regarding the bathroom on the top left-hand corner, the solution to this may be tied to water heater vent if the best solution is to have a separate vent for water heater going straight up. Ideally, I would hope to tie this bathroom into the main stack on the far right (see the copper color line named option 1). However, I don’t know if the fixtures being about 30ft away from the main stack is a problem. Option 2 is the blue line which is have another opening on top for venting. Draining will still be connected to the main stack (see the red line).
I have seen posts saying that if a toilet is within 6ft of soil stack, then 3in PVC is fine. If 4in PVC is used, then the distance can be as far as 10ft. In this particular case, toilet is about 34ft away from the main stack. Is this going to be a problem even if I use a 4in PVC pipe for draining? I am not too worried about the slope because the draining PVC pipe will go through floor joists which are 12in in height. With ~34ft, I only need to have a height differential of ~8 inches to have enough flow in the drain PVC pipe which should be okay as far as the holes on the joists are concerned.
The thing I am confused is whether the 6ft (3in PVC) or 10ft (4in PVC) distance requirement is for venting (which I am okay to add a separate vent pipe shown in blue up) or for draining (which means there is no solution unless I redesign the floor plan and move the bathroom), or for both.
We are in New Jersey.
1. Venting of the water heater.
2. The bathroom on the top left-hand corner which is very far from the main stack which is sitting close to the right-hand side (the thickest vertical line on the right).
The 3 bathrooms and kitchen should all be fine because the furthest fixture is still within 10ft of the main stack, so the worst case, as far as I can tell, is that I will use a 4in PVC pipe to connect to the main stack, both top for vent and bottom for drain.
Regarding venting of the water heater. The location of it remains the same, but since there is currently no second floor (not even attic), the existing vent goes up directly and out of roof. One option is to continue to extend the same pipe going through second floor, attic, and out of roof, but this will go through the bathroom directly above in the middle. Can I use 2 90-degree PVC elbows to bring the vent into the wall, go all the way up to attic, another 2 90-degree elbows to bring the pipe inside, and then go straight up out of roof? Or potentially is there another way to tie this into the main venting/drain stack system so I don’t need to have another hole on roof? Either utilizing the newly added attic space or through walls/joists?
Regarding the bathroom on the top left-hand corner, the solution to this may be tied to water heater vent if the best solution is to have a separate vent for water heater going straight up. Ideally, I would hope to tie this bathroom into the main stack on the far right (see the copper color line named option 1). However, I don’t know if the fixtures being about 30ft away from the main stack is a problem. Option 2 is the blue line which is have another opening on top for venting. Draining will still be connected to the main stack (see the red line).
I have seen posts saying that if a toilet is within 6ft of soil stack, then 3in PVC is fine. If 4in PVC is used, then the distance can be as far as 10ft. In this particular case, toilet is about 34ft away from the main stack. Is this going to be a problem even if I use a 4in PVC pipe for draining? I am not too worried about the slope because the draining PVC pipe will go through floor joists which are 12in in height. With ~34ft, I only need to have a height differential of ~8 inches to have enough flow in the drain PVC pipe which should be okay as far as the holes on the joists are concerned.
The thing I am confused is whether the 6ft (3in PVC) or 10ft (4in PVC) distance requirement is for venting (which I am okay to add a separate vent pipe shown in blue up) or for draining (which means there is no solution unless I redesign the floor plan and move the bathroom), or for both.
We are in New Jersey.