angle of drain on a 16 ft toilet pipe run


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Old 12-16-07, 07:58 PM
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angle of drain on a 16 ft toilet pipe run

Hi Folks, I Have a case where I am running a new toilet installation to a stack 16 ft away. There is a sanitary TEE at the stack - it comes out at horizontal. I know the pipe must run at more than flat for proper drainage. The Question is:
How do I connect the pipe to get a drain angle to a flat fitting. Do I A) fudge the gluing a little bit and angle the pipe up slightly?
or b) add some other elbow to make it angle up at 15 degrees or so?
Please advise,
Thanks,
Martin
 
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Old 12-17-07, 05:43 AM
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Martin, welcome to the forums! Drains are generally set at 1/4" per foot of run, so in 16' you would drop 4" to the hub.
 
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Old 12-17-07, 07:52 PM
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Threaded cast iron fittings are actually available with the inlet connection being set at proper pitch.

As far as I know, they do not do this with ABS or PVC, because it is easy to "wing it"
 
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Old 12-18-07, 05:07 AM
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You may have to incorporate a fernco fitting in order to achieve the proper angle if the hub is cast iron, since there is no "give" in already installed pipe.
 
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Old 12-18-07, 07:24 AM
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Unless the stack Tee is located 4" below the start of your horizontal run you are going to have to transition from your horizontal run to the tee. If the tee is located significantly below your new line resist the temptation to exceed the
1/4"/ft slope. If the te is located higher than the 4" drop needed you'll have to move the tee.
 
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Old 12-21-07, 08:30 PM
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CWBUFF Wrote - "If the tee is located significantly below your new line resist the temptation to exceed the
1/4"/ft slope. If the te is located higher than the 4" drop needed you'll have to move the tee." Did you mean resis the temptation to go LESS than the 1/4 inch per foot slope?
It seems that MORE would not be an issue.
Please advise,
Thanks,
Martin
 
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Old 12-22-07, 10:18 AM
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Martin - In a long horizontal run of pipe, excess slope can become an issue. Water will drain too quickly and solid waste might be left behind.
 
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Old 12-22-07, 10:23 AM
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if I need to drop under a rafter support beam - would you recommend a 90 down, then a 90 sideways again, then a gradual drop the rest of the way?
Thanks in advance,
Martin
 
 

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