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Old 03-26-2011, 11:07 PM   #1
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floor drain venting and sizing..


Need help trying to figure out how to size floor drains size of opening,trap and drainage pipe....cant figure out online formula....floor drains will be installed in a public restroom....also do floor drains need to be vented if they are within a certain feet from a main building drain,,,,, please help.....thank you all.......

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Old 03-27-2011, 12:43 AM   #2
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floor drain venting and sizing..


Depends on what code your town uses. For me its 2" drain and trap, and it must be vented. Drainage fixtures=2. 11/2" vent.

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Old 03-27-2011, 07:51 AM   #3
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floor drain venting and sizing..


In Canada, a floor drain need not be vented if it is minimun 3" in size, and the trap arm (pipe from the main drain to the trap) is a minimum of 16" long, maximum 12 feet with 1/4" per foot grade on it.
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