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Old 01-22-2011, 12:45 AM   #1
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dwv for new bathroom


I'm adding a second bath to my ranch house. The house sits on a crawl space about 4 feet high. The existing drain line is close to ground level, about 16-17 lateral feet from the addition. Should the new bath drain drop to near the ground and then slope gradually to the Y into the existing drain, or run up near the floor joists and then drop to the existing pipe?

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Old 01-22-2011, 06:10 AM   #2
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I'd keep it high and drop it near the drain---You don't want a fat guy climbing over your pipes and breaking them---better he should conk his head--Mike--

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Old 01-22-2011, 04:19 PM   #3
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That makes sense, Mike. Although, I'll be the one conking my head. I always get a little nervous stepping over the existing pipe. I figure one trip or slip and I'll have a mess. I wasn't sure if one way or another would flow better.

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Old 01-22-2011, 05:07 PM   #4
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In my neck of the woods we reserve the first 12" or so for the duct work if it will be installed. As far as flow goes- makes no difference.
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Old 01-22-2011, 06:51 PM   #5
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Eplumber, do you mean the first 12" of height, measured down from the floor joists, or the first 12" coming sideways off the drain?
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Old 01-22-2011, 07:03 PM   #6
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Quote:
Originally Posted by ratherbefishing View Post
Eplumber, do you mean the first 12" of height, measured down from the floor joists, or the first 12" coming sideways off the drain?
12" apprx between the pipe and bottom of joists. This saves arguments between hvac and plumbers. Its generally easier to lower pipes then offset ductwork. They like to fasten the ducts to the bottom of the joists but if the grade is not there then the tin banger's out of luck
Just coordinate with the other trades-- can save headaches.
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Old 01-22-2011, 09:01 PM   #7
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In this case, I'm all the other tradesmen. So thanks for the tip. No need to tick off myself!

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