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Old 05-03-2012, 11:55 AM   #1
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Main Drain Replacement?

I have a half bath with a toilet and sink. There is a 4" cast iron main drain running through the floor. I'm planning to convert the sink to a double sink and install a bath tub. According to the code, when I pull a permit and do the inspection, would they require me to replace the entire main drain which runs into the laundry room also or can I break the slab and tap into the existing drain line? Will they inspect all of the plumbing in the bathroom or just the modifications to add a double sink and the tub?

There are also old supply lines from the sink which I can tap into. Would they require me to replace all the old supply lines in the bathroom or can I tap into them?

The city uses the 2006 IPC and it's in Norfolk, VA.

Thank you for your help! I'm just trying to get it right the first time.


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Old 05-03-2012, 06:20 PM   #2
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Im not sure why you couldnt tie into the existing groundwork if its in good shape still,if theres any doubt in its condition Id go ahead and replace it while floor is open though.
Your venting might be an issue depepending on existing conditions.


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Old 05-03-2012, 09:26 PM   #3
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My personal opinion aligns with plummen's

If you are busting up concrete : Replace the entire line. You don't want to end up with brand new finished floors and walls and end up with a big sewage backup and have to start over again.
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Old 05-04-2012, 06:58 AM   #4
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Before you start anything I would make a drawing of what youíre planning and a drawing of how you plan on piping it in. go see the plumbing inspector and go over it with him. Show fittings and venting and pipe sizes in the rough above and below ground for drain and supply. You need only test the new work, existing lines must run dry. If they donít that may be an issue. Hopefully you are able to pull an owners permit, here home owners cannot pull plumbing permits for DIY work, must be done by a plumbing contractor. Good luck on your job.

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