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Old 03-28-2011, 09:13 PM   #1
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replacing parts of cast iron vent stack


i am remodeling my house that has a full size basement and two floors above. there is a 4" vent stack that goes all the way through. I would like to replace the part of it that goes from where the waste starts coming in (between the 1st and 2nd floor, or slightly above the 2nd floor level) all the way down, for obvious reasons. i have already replaced about 75% of the basement part, including the part going underground. so the cast iron that's left right now is from about 75% above the basement floor all the way to the roof.

so i want to leave cast iron going from the 2nd floor to the roof, basically. the pipe is probably as old as the house, i.e. 100 yrs. my concern is whether i can rely on the part above from where i cut it to stay solidly suspended from the roof/ceiling so that when i remove a part that connects it to the ground (which i would guess is the pillar of bearing support rather than some questionable suspension structure above), it will stay in place rather than fall down under its immense weight and rip the roof etc.

i am asking this because i don't know how they built it in the first place, i.e. how and if they affixed it on the roof.

when i replaced the part going into the ground, i had this same dilemma, however, it had the framing on the 2nd and 1st floor to rest onto, now that is gone so i am afraid when i cut that part, what if it just slides off causing serious damage.

pictures attached.

thanks
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replacing parts of cast iron vent stack-p1020611.jpg   replacing parts of cast iron vent stack-p1020612.jpg   replacing parts of cast iron vent stack-p1020613.jpg   replacing parts of cast iron vent stack-p1020614.jpg  

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Old 03-28-2011, 10:07 PM   #2
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replacing parts of cast iron vent stack


Google "riser clamps".

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Old 03-29-2011, 12:07 AM   #3
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replacing parts of cast iron vent stack


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Google "riser clamps".
you saying it probably has those already (away from sight somewhere, maybe in the attic area where i can't see it ? that may have been what was holding it the first time.
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Old 03-29-2011, 12:16 AM   #4
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replacing parts of cast iron vent stack


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you saying it probably has those already (away from sight somewhere, maybe in the attic area where i can't see it ? that may have been what was holding it the first time.
I think he's suggesting putting one on every floor level cuz I don't see them in your pics.
Start in your attic. Lay some supports across your ceiling joists and put a riser clamp on top of that- secure it somehow from lateral movement. Do something similar at every floor. Then start from the top and cut and remove the pipe. Looks like the stack will fall if you don't
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Old 03-29-2011, 10:27 AM   #5
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replacing parts of cast iron vent stack


Makarevic , why would you want to replace that section of the pipe at the first place, I'm not seeing obvious reasons?
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Old 03-29-2011, 01:44 PM   #6
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replacing parts of cast iron vent stack


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Makarevic , why would you want to replace that section of the pipe at the first place, I'm not seeing obvious reasons?
making a bathroom on the 2nd floor and a powder room on the 1st floor, that will both tie into it.
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Old 03-29-2011, 02:00 PM   #7
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replacing parts of cast iron vent stack


Support the wye with a piece of 2x6 for right now that will hold the upper piece of pipe in place.
Just make sure to use plenty of 3-1/2 " screws.
Later on you will have to frame the box around tha pipe anyhow , that will keep everything in place.

Are you putting in a powder room with a toilet or just a vanity?
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Old 03-30-2011, 03:41 AM   #8
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Are you putting in a powder room with a toilet or just a vanity?
both. the toilet will be right next to the stack.

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