S-Trap & Sink Flange

Old 11-24-05, 11:34 AM
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S-Trap & Sink Flange

I have 2 questions, thanks in advance.
--If I am doing a new vanity cab, sink and faucet upgrade, can I keep my
S-trap drain set-up OR are S-traps now illegal and have to be replaced with
--When I install the drain flange to a marble sink top, I know I need to use silicone instead of plumbers putty to prevent staining. Do I have to wait for the silicone to dry before filling the sink and checking for leaks? How long?
Do I risk washing it out otherwise?

Last edited by Capt; 11-24-05 at 11:35 AM. Reason: Correction
Old 11-24-05, 12:14 PM
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It is advisable to replace the "S" trap. These are easily sucked dry which allows sewer gas into your home. In my OPINION, it would be safer to cut off the "S" trap and install a tee for a new trap assembly and go as high as you can under the sink and install an Air Admittance Valve. AAV's may not be legal in your area but given the choice, I would go with it.
As far as the silicone. Yes, you have to let it cure fully or it will weaken the seal and you would probably have a leak. Good luck witrh your project.

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