necessary to apply plumbers putty under bathroom sink flange?

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Old 02-16-14, 03:01 AM
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necessary to apply plumbers putty under bathroom sink flange?

It seems unnecessary to apply putty between the basin and the drain flange. The reason is because just below that is the overflow chamber. It seems to me that the basin officially seals at the lower rubber seal/nut. thoughts?
 
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Old 02-16-14, 05:05 AM
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I have sometimes had difficulty getting the rubber washer to seal completely around the threads. Probably OK to get a few drips from the rare overflow use but a problem for the daily use of the main drain so I use plumbers putty. You might get lucky and not need it but putty is so cheap and easy I just go ahead and use it.
 
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Old 02-16-14, 06:03 AM
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Thanks Dane - just so I'm clear, you and I are talking about the sink drain flange on the top side of the basin, not the underside correct?
 
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Old 02-16-14, 06:31 AM
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Use putty... It will leak with out it...

If you doubt it then go ahead and try without....
 
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Old 02-16-14, 06:34 AM
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Also if you use teflon like this you will never have a leak... been doing it this way 30 plus years...


heres a recent sink install.

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Old 02-16-14, 06:38 AM
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Plumber putty is a must except when using cultured marble. Manufacturer clearly states to use silicon to seal. If not staining will occur.
 
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Old 02-16-14, 06:47 AM
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Plumber putty is a must except when using cultured marble. Manufacturer clearly states to use silicon to seal. If not staining will occur.
And hairline cracks over time...
 
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Old 02-16-14, 08:54 AM
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I'm all cleared up. Thank you all!

@lawrosa - thanks for the pics. That was awesome.
 
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Old 02-16-14, 05:19 PM
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I love this place, I learn something new every day on this forum!

Lawrosa,

I was going to use a thin bead of silicone around the bath tub drain flange,
should putty be used in place of the silicone?

I will add the Teflon paste to the mix too.

Thanks,
 
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Old 02-16-14, 05:30 PM
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I always use putty unless the sink/tub manufacturer suggests otherwise...
 
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