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Old 08-06-2009, 07:08 PM   #1
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Required tub drain slope?

We just removed an old clawfoot tub with an end drain. Our idea is to replace with a larger tub with a center drain but utilize the original floor point. Our plumber told us that Oregon code requires the tub drain to be directly over the floor drain. I have spent the last hour combing through the Oregon residential plumbing specialty codes and can't find any reference to this requirement.

The tub we are considering has the center drain exit 4.5" above floor level and the run to the original floor driain is about 33". I saw a previous post that suggested a drain slope of 1/4" per 12". With this guideline, it seems like our set-up would meet with no issues.

Am I missing something?


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Old 08-06-2009, 11:10 PM   #2
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The IRC and the IPC both require at least 1/4" per foot of slope on that size of pipe. I can't speak to any amendments that your jurisdiction might have made though.

I'd have more concerns about how you're going to make the connections from the new drain to an existing floor drain.


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