Hello,

I would like to put in a 2nd full bath on the 2nd floor of our cape cod. Currently, there's a 4" cast iron DWV that runs up a channel to the 2nd floor and then vents out to the roof. I was wondering whether it is possible to use flexible copper tubing to run the water lines up that same channel as oppose to busting a wall to install solid copper piping. If it is possible, will it be consider within code to do so. Also if I can do this, do I need to use a bigger diameter pipe beyond 1/2 inch.

TIA

Instead of solid copper piping I meant to say rigid copper piping.

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Originally Posted by ebaut001

Hello,

I would like to put in a 2nd full bath on the 2nd floor of our cape cod. Currently, there's a 4" cast iron DWV that runs up a channel to the 2nd floor and then vents out to the roof. I was wondering whether it is possible to use flexible copper tubing to run the water lines up that same channel as oppose to busting a wall to install solid copper piping. If it is possible, will it be consider within code to do so. Also if I can do this, do I need to use a bigger diameter pipe beyond 1/2 inch.

TIA

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Running byour supplies up the same chase as a stack vent is acceptable.If you have a standard three fixture bath, (toilet, lavatory and tub/shower) 1/2" will work as long as they are taken off a 3/4" main. Good luck, tom