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Old 03-22-2010, 12:11 PM   #1
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Routing new drain


Hello all - first time post but have been lurking awhile, great site.

We are redoing are kitchen and have decided to place the sink and dishwasher in the island. The current sink drain is on the wall appx. 8' (straight line) from where I want it to go in the middle of the kitchen. I'm trying to figuring out the best way to route the drain. I should note, we have a finished basement under the kitchen. Our floors have 2x8 joists. Option 1 - run the drain through a few studs, make a right turn and run it along the floor joist. Option 2 - run it through the floor joists directly to the island. With option 1 I would need to drill through only 2-3 studs and no joists but the run would be longer. Option 2 is more direct but I'm drilling holes in 3-5 joists. I have no problem removing the sections of subfloor to gain access. What would you guys do? Thanks.

Jack

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Old 03-22-2010, 06:51 PM   #2
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Routing new drain


option 1 but make sure you install an aav (automatic air vent) at sink

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Old 03-22-2010, 07:16 PM   #3
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I am also thinking that drilling through a couple of studs rather than the floor joists would be a better option. After doing a little reading I'm discovering that draining and venting an island isn't as straight forward as I thought. I found an illustration of a loop set-up under the island counter for venting. The AAV would definitely be easier. Any potential problems using the AAVs? How about code issues? I appreciate your opinions. Thanks

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Old 03-22-2010, 07:43 PM   #4
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I have read here that they are not allowed in Chicago, but haven't heard any problems anywhere else.
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Old 03-22-2010, 08:35 PM   #5
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the holes in 2x8 will be to large in my opinion so studs b better
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Old 03-22-2010, 10:23 PM   #6
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Routing new drain


Our inspector will not sign off on an AAV even though nothing in the codebook really specifically prohibits it. A loop vent while being a little more difficult and expensive really is the correct way to do it. Although, being in a 2x8 floor joist, you may not have enough room below to do it.

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Old 03-22-2010, 10:24 PM   #7
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tear out basement ceiling and run it to the stack,i know it sounds like a pain but i think its much easier to judge things
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Old 03-24-2010, 04:06 PM   #8
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Thanks to all for the advice. I was hoping do to this myself but I'm now reconsidering. I also need to get a 15' run of propane line in place for a stove. A consult from a plumber may not be a bad way to go. I want to make sure I get it done right; and in a reasonable amount of time. My family has put me on a time table to get this done; they're tired of living in a construction zone

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