Moving Bathtub Drain

Old 05-03-04, 06:51 AM
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Moving Bathtub Drain

I am replacing a cast iron tub (already removed) with an acrylic whirlpool tub. To do so, I have to move the drain about 40" from the old location. When I cut through the sub floor, I found a heating duct under the floor there, but about 3 inches below the subfloor. This means I could still run a drain pipe from there over to the old drain, and tie into the J that's already there, but the J wouldn't be DIRECTLY under the tub drain. So.... the questions are:

1) what's the code say about placing a drain above a duct pipe?
2) is there any problem having the J 40" from the actual drain?

Thanks (I've learned so much from these forums already!)
Old 05-04-04, 01:13 PM
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Well, I'm not a pro plumber so you won't learn much from me, especially anything about code.
But since no one has answered you since yesterday, I'll just give my 2 cents.
I don't think that "code" addresses pipes over HVAC ductwork. Should be O.K.
A "j" (or tub shoe) needs to be under the drain so that you can screw the drain into it.
I would cut the other "j" off and connect the new pipe to the old with a Fernco coupling or no-hub coupling (or replace the whole piece of pipe from the tub drain to the wall). Allow 1/4" of slope per linear foot of drain pipe run. It all has to end up to a vented trap at the wall.
Good Luck!

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