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    nervous's Avatar
    nervous Posts: 47, Reputation: 1
    Junior Member
    		  
    #1

    Apr 17, 2005, 07:46 PM
    3" PVC toilet drain size performance?
    How appropriate and adequate is 3" PVC drain for a toilet? It would solve the current issue I have with a ridge from trying to mate 4" PVC to cast iron. I could slip the 3" pvc right into the main stack and avoid the butting of PVC and cast iron.

    I do see that most PVC toilet goods come in both 3" and 4" but I need to be comfortable that 3" is acceptable in performance before committing to it.

    Thanks.
    tommytman's Avatar
    tommytman Posts: 153, Reputation: 2
    Junior Member
    		  
    #2

    Apr 17, 2005, 10:10 PM
    I would think it should be fine... but I don't understand your original problem.

    Tom
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Apr 18, 2005, 07:45 AM
    Quote Originally Posted by nervous
    How appropriate and adequate is 3" PVC drain for a toilet? It would solve the current issue I have with a ridge from trying to mate 4" PVC to cast iron. I could slip the 3" pvc right into the main stack and avoid the butting of PVC and cast iron.

    I do see that most PVC toilet goods come in both 3" and 4" but I need to be comfortable that 3" is acceptable in performance before commiting to it.

    Thanks.
    A 3" toilet drain is acceptable on all 2nd. story baths and 1st. floor baths where there is a basement. However, county codes differ on slab installations under cement. In my area Manatee county allows 3" toilet drains under the slab while Sarasota County holds you to 4". I would be comfortable using 3" drains myself. Good luck, Tom
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