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Ask The Trades › DIY Forum › Plumbing Questions › waste sealing

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waste sealing (Read 938 times)

Flashbang

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waste sealing
Oct 17^th, 2023, 6:11pm

Hi all,
I'm being driven made by a leaking click clack waste. Originally a new waste was fitted to a sink wash basen and only the supplied two sealing washers were used. One thin one between sink top and waste undersides the other thicker washer to the sinks underside and the plastic fixing nut tightened onto this washer. The fitting leaked!
I removed the waste and applied a bead of white mastic to the sinks dried and cleaned waste hole and also around sinks underside. Then refitted the waste with the two washers. Left it for some 16 hours before testing with water and It Leaked!
Should the two supplied washers be used? Or should the waste be seated top and bottom in just a fresh application of mastic?

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woodsmith

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Re: waste sealing
Reply #1 - Oct 18^th, 2023, 8:14am

Unfortunately you’ve put the washers the wrong way round! The soft thicker one goes under the rim of the waste, the thin one goes between the nut and the sink. If the washers are ok then you shouldn’t need any sealant. If you do need to add sealant use it very sparingly and just smear a thin layer on each surface of the two washers. Some sinks are manufactured in a way that makes getting a good seal unreasonably difficult but using a lot of sealant is usually counterproductive.

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Flashbang Junior Member Offline I've been P'eeeeeeed Posts: 117 Total Thanks: 0 For This Post: 0 Gender:	Re: waste sealing Reply #2 - Oct 18^th, 2023, 4:33pm Hi Thanks for the reply. The wastes instructions (copied below) clearly show the thinner washer against the ceramic basin top and the thicker washer underneath against the basin underside and immediately behind the locking nut?
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woodsmith Global Moderator Trade Member Author Offline Posts: 4395 Total Thanks: 135 For This Post: 0 Gender: Trade: Joiner	Re: waste sealing Reply #3 - Oct 19^th, 2023, 8:23am The ones I’ve fitted had a softer thicker washer at the top yours maybe different? Where exactly is it leaking? It’s possible it’s a faulty fitting and it’s leaking around the screw threads, in which case you could try winding PTFE tape around the threads to create a seal.
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Flashbang

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Re: waste sealing
Reply #4 - Oct 19^th, 2023, 11:55am

woodsmith wrote on Oct 19^th, 2023, 8:23am:

The ones I’ve fitted had a softer thicker washer at the top yours maybe different? Where exactly is it leaking? It’s possible it’s a faulty fitting and it’s leaking around the screw threads, in which case you could try winding PTFE tape around the threads to create a seal.

Hard to say exactly where the leak is coming from as its almost impossible to see, but the thread is wet. Will try some PTFE tape on the thread and refit nut.

What I cant grasp is why its leaking in the first place, as there are two separate layers of Silicon mastic used, one under the rims washer around the bowls upper surface and the second underneath behind the thicker washer!

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woodsmith Global Moderator Trade Member Author Offline Posts: 4395 Total Thanks: 135 For This Post: 0 Gender: Trade: Joiner	Re: waste sealing Reply #5 - Oct 20^th, 2023, 7:57am As you’ve done such a thorough job on sealing round the washers the only option is the threads. I’ve had the very occasional leak this way, I think the thread is cut too loose allowing water to track down. PTFE tape should fix it.
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Flashbang

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Re: waste sealing
Reply #6 - Oct 24^th, 2023, 2:37pm

Hi
I tried PTFE tape but it was almost impossible to get the tape up the thread far enough. However, I tried and refitted the nut to the sinks underside. Result... Still leaking, but a lot less!
So Ive taken the proverbal Bull by the Horns, ripped it all out, cleaned off all the silicon from the top and undersides of the sink and purchased a new Click Clack waste. Re applied more silicon before fitting the new waste outlet and Bingo... No leak! I guess the former outlet was faulty in the thread area and just wouldn't seal 100%.
Thanks for the suggestions anyway.

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woodsmith Global Moderator Trade Member Author Offline Posts: 4395 Total Thanks: 135 For This Post: 0 Gender: Trade: Joiner	Re: waste sealing Reply #7 - Oct 25^th, 2023, 8:17am Thanks for letting me know how you got on, glad you got it sorted in the end.
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