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Old 08-20-2008, 03:16 PM   #1
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Basement bathroom venting


I am considering the installation of a saniflo upflushing style toilet a saniplus to be precise. I need to vent the unit. I have a chase up to the attic next to the existing cast iron vent stack. I can run the pvc up to the attic I assume but the vent pipes that tie into the cast iron main vent pipe are like a galavanized pipe. I am looking for the best way to tie into these vent connections. Should I cut out a section of pipe and insert a pvc wye fitting to connect the pvc vent pipe?

Thanks in advance for you advice.

Doug Russell

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Old 08-21-2008, 10:02 AM   #2
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Basement bathroom venting


WOW - You are lucky you can chase a pipe up to attic. You could couple to existing stack. It would be easier to just put a new hole in the roof. Probably cheaper too. Just flash it properly of course.

Cutting the stack could cause problems depending on where the weight is supported. You also need special tools to cut it. Connections are now easy with rubber/stainless "no hub" connectors.

Actually I don't think, once I was in attic, I would try to tee into the cast iron. I would probably cut the cast iron and replace the roof penetration with PVC. That way you do not need to worry about more than once CI>PVC connection and you do not have the weight of the stack above to support.

So - Either new penetration or new stack from attic up is how I would do it.

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Old 08-21-2008, 07:43 PM   #3
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Basement bathroom venting


Thanks for the response Brik...

I think I will take your advice, run the pipe up the chase into the attic and just put a new hole in the roof, flash it and be done...

Since the house is a ranch it makes it a lot easier. The original builder left a substantial space there around the vent stack....

Doug
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