waste fitting

[confused 2]

When fitting new wastes should I just rely on the supplied spongy type washer, or use some other sealer as well, if so what??

 

[Mikeyboy]

Reccomend P.T.F.E. tape around parallel thread of basin waste , under basin porcelain ,also clear , or white dow corning silicone sealant on mating surfaces .

 

[Softus]

When fitting new wastes should I just rely on the supplied spongy type washer

Yes.

...or use some other sealer as well, if so what??

No.

 

[confused 2]

Thanks folks, thats one each then, anyone else like to chip in??? before I bang my head against the wall

 

[Nige F]

Putty everywhere..(as no-one likes Plumbers mate ) Used to be red lead putty That`s why my brain is gone

 

[Softus]

Thanks folks, thats one each then, anyone else like to chip in??? before I bang my head against the wall

You asked a general question about wastes - I gave you a general answer.

If you have a specific waste to fit, perhaps you'd like to give more details.
For example, kitchen, basket, with/without overflow, basin, slotted/non-slotted, etc.?

 

[confused 2]

Softus sorry if I did not make myself clear I realise that "different" types of waste need sealing in different ways but my specific question refers to the actual sealing of the top flange only, ie is the spongy washer supplied sufficient on its own??

 

[Softus]

Softus sorry if I did not make myself clear

No need to apologise at all, but thank you anyway

...my specific question refers to the actual sealing of the top flange only, ie is the spongy washer supplied sufficient on its own??

I still reeeely need to have a yes/no answer to the following questions:

1. Kitchen sink?
2. Basket?
3. Non-basket?
4. With overflow?
5. Without overflow?
6. Basin?
7. Slotted?
8. Non-slotted?
9. Bath?
10. With overflow?
11. Without overflow?
12. Shower?
13. Other (please state)?

 

[Gasguru]

Bin the seals that come with the waste. Most sanitaryware is so uneven around the waste hole these seals never work. Or if they don't leak when you install them them they soon will be.

Use a quality clear silicon under the top flange and a basin mate kit (toolsation.com or small plumbers merchants) for the thread side (plus a large flanged brass backnut). Easy and works every time.

 

[Softus]

Am I missing something? Where does the poster say that this is a basin waste?

In fact, where does he say anything in any detail whatsoever?

 

[confused 2]

OK I give in, first two that I have to do are basins with slotted wastes/built in overflows, then two showers, then a bath, then a double bowl sink with a basket in one half, sorry but you did ask.

 

[Softus]

You may have already guessed, but wastes on sanitaryware are always a judgement call, because some castings leave a lot to be desired. Unless there's a good reason not to, I use a bead of Plumber's Mait under the flange, then backfill (using white silicone so that you can see it) the gap around the bottom of the tail, then add a poly washer, then the backnut. (I generally avoid brass backnuts with sanitaryware, to avoid the risk of cracking - plastic backnuts are more forgiving.)

Gasguru has another method, which he's happy with, so you might want to consider doing that.

Shower trays are usually simpler, i.e. flatter underneath. Wherever possible I use a McAlpine trap because they're very good quality. If access is good I install the trap using the supplied rubber washer, without any sealant anywhere. If I feel that I might struggle to get the fitting tight, then I use a thick smear of LSX on each side of the rubber washer.

Bath - as per shower tray.

Sink baskets are easier - nothing at all under the flange, rubber washer only if it's soft enough, thick LSX smear if not. Backnut doesn't apply of course.

Where there's a built in overflow spigot on the waste, they always seem to be a bit crap, so I invariably use LSX both to encourage the tube to stay in place and to seal it.

Basically, whatever waste it is, think carefully at where you're trying to keep the water in, and look carefully at the state of the faces that you're trying to seal, then do whatever it takes to make that joint a good one.