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Old 02-08-2011, 01:25 PM   #1
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shower drain routing question


I have removed an old cast iron soil stack and am replacing it with ABS. There is a unfinished basement below our shower, and the current drain pipe connects with the soil stack. I will eventually finish the basement, and am hoping to change the route of the drain pipe to allow for more headroom when finishing the basement. I am hoping it is OK to first run the pipe towards the wall keeping it in between the floor joists, then making a 90 degree turn towards the soil stack, and finally another 90 degree turn and another 2 foot run to the stack. Am I placing in too many 90's or is this OK as long as I maintain the 1/4" drop per foot? My other option would be to not take it as far towards the wall on the first run, and remove the last 90 by running directly at it. I have attached a picture showing the two proposed routes (green and black to the soil stack). Thanks for any advice.
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Old 02-10-2011, 01:15 PM   #2
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shower drain routing question


Any help on this would be greatly appreciated. From further research, I have found 2 possible answers. The first is that it is OK, but I should install cleanouts at each 90. The second, is that 90's should be avoided on horizontal drain lines. Are either of these correct, and is 1.5" good enough for the shower/tub drain, or should it be 2"?

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Old 02-10-2011, 01:45 PM   #3
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shower drain routing question


I believe that you will be O.K. with that---was there a vent in that line? You may be further than code allows with that 6 foot run---

Let's see what a licensed plumber has to say---Mike--

A photo of the existing piping would help.
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Old 02-10-2011, 07:57 PM   #4
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shower drain routing question


The following are code items for my area. Don't know where you are so I don't know what code you should follow.

11/2" drain is ok for a tub, 2" for a shower.
Try to delete your last 90 if you can, no clean out would then be needed
Use long sweep 90's or 2 45's when running horz. pipe
Trap shouldn't be more than 5ft from the vent (1.5")
Maintain the 1/4" grade- not offsets downward before the vent. After vent, ok
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Old 02-11-2011, 11:01 AM   #5
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shower drain routing question


Thanks for the replies. I was thinking about taking the route EPlumber suggested and removing the last 90 just to be safe. I have removed all the pipe so I don't have anything to take a picture with. I will post the finished results and let you know how the inspection goes.

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