Kitchen waste too high, is the only option to lower?

[mikeduk]

Hi all, I got around to trying to replace a family members sink/waste/trap setup today. Only to realise it seems a much bigger job than I'd originally imagined. I don't think leaking can be stopped (over time) with the waste being so high?

It's been like this for 10 years. I imagine they've added the tape thinking it's old fatigued plastic pipe joins, not realising it's leaking because the water level will be constantly above the waste pipe level within the trap setup, and over time that'll inevitably start leaking?

I don't want to re-do what's there at present at it all start leaking not long down the line, am I correct in thinking that?

Here's an image of where the waste exits outside:

What would be the best approach to take it this situation? I told them I'd have it sorted today, but didn't know what I was getting myself into

If I needed to drop the waste, how big of a job is doing something like that?

 

[mikeduk]

I'm wondering if fitting a single bowl sink and using a much shorter trap setup would work? To avoid having to lower the waste.

Something like this: https://www.screwfix.com/p/floplast-sink-washing-machine-trap-white-40mm/12794

 

[Hugh Jaleak]

Fit a decent 1 1/2 Bowl waste Kit, i.e. McAlpine, and see where the outlet of that comes in relation to the existing waste pipe. If it's still too low to couple onto it, bite the bullet and core another hole through the wall, I cant see as changing the sink is going to alter much.

I would get shot of that self cutting washing machine valve while you've got room and fit a proper valve.

 

[Koolpc]

Core drill lower down on the wall. Do it once do it properly...

 

[phatboy]

One of these would help:

Amazon.co.uk

The half sink pipe can be reduced to nearly nothing, so the whole lot would be a reasonable amount higher.

 

[Mottie]

What’s under the black tape - is that an adjustable section? If so, just move the lot upwards. Better still, buy a new 1.5 sink adjustable fitting kit.

 

[Madrab]

Difficult to see by pic1 but if the wall outflow is lower than the horizontal run of any of the sink waste kits then regardless of how high you can take the kit then the trap outflow will always be lower, therefore the run out through the wall will have to be lowered.

 

[DP]

Bowl and a half Sink Kit | McAlpine Plumbing

Optimize your sink setup with the Bowl and A Half Sink Kit, ensuring a reliable and efficient solution for water flow.

mcalpineplumbing.com

See if this trap fits
You will need this trap to sort the ugly mess and core the wall with 40mm core too at a lower point.

 

[mikeduk]

Bowl and a half Sink Kit | McAlpine Plumbing

Optimize your sink setup with the Bowl and A Half Sink Kit, ensuring a reliable and efficient solution for water flow.

mcalpineplumbing.com

See if this trap fits
You will need this trap to sort the ugly mess and core the wall with 40mm core too at a lower point.

Will I need a special type of drill to make this kind of core? I've got access to a cordless drill and a hammer drill, but I don't think either of those would be suitable for this. Would a hire shop be my best bet?

 

[Madrab]

You need a clutched SDS drill with a 52mm dry corer tube - a hire shop should be able to supply if you can't get a loaner anywhere else.

 

[mikeduk]

You need a clutched SDS drill with a 52mm dry corer tube - a hire shop should be able to supply if you can't get a loaner anywhere else.

Thanks Madrab, would something like this get the job done: https://www.toolstation.com/makita-3-function-800w-sds-rotary-hammer-drill/p20464

I'm thinking it might be a worth while investment as I'll need to drill a waste outflow when updating my kitchen later on this year.

Also, can I ask, in your earlier comment, did you mean if the wall outflow is higher than any horizontal run of the sink waste, then the outflow needs lowering? I think that's what you meant. Here's another picture taken at level height, think it shows it's going to be very difficult to get the horizontal runs of the sink waste higher than the current waste outflow.

 

[Koolpc]

You would still need to get the core drill bits.

I would hire it all. Wouldnt be a lot....

That waste outlet is much too high....do the job right now while you can. You will save money and headache in the future..

 

[mikeduk]

Thanks guys, I'll have a call around the hire ships to find some prices for 'clutched SDS drill with a 52mm dry corer tube', hopefully it's not too expensive.

In terms of drilling the core, should I fit the new sink and trap first, find out where the hole needs to be and then drill it. I don't need to take into consideration any fall angle for the waste outflow?

 

[Madrab]

Yes - but for what you need it to do and if you're only lightly using it then this would do as equally as well - if you think you may have the need to use it in the future.

Draper Storm Force SDS+ Rotary Hammer Drill, 900W

Features:• 3 functions - Drill, Hammer and Chisel• Safety clutch• Depth rod• Supplied with adjustable side handle, 2 x SDS+ chisels, 3 x SDS+ drill bits and 2.2m cable with BS Plug • No load speed 850rpm • Max impact rate 4100bpm • Impact joules 4J • Drilling capacity masonry 26mm • Drilling...

www.toolstation.com

Minotaur Diamond Core Drill Bit Set

For fast, clean cutting and drilling in masonry, bricks or blocks, look no further than this Minotaur diamond core drill set. Supplied with accessories and a handy carry case, you'll be ready for a range of jobs - the kit includes 38mm, 52mm, 117mm diamond core drill bits suitable for wet and...

www.toolstation.com

If you wouldn't use it again then hiring would be the cheapest, less wasteful, option

did you mean if the wall outflow is higher than any horizontal run of the sink waste, then the outflow needs lowering?

Yes - as you can see from the pic the waste outflow is almost at the same height as the bottom of the sink waste - no way any correct waste trap set up would reach that if it is to work correctly. That was the failing of the last one - the homemade u bend and then a pipe that travelled up too high, which meant that the whole sink waste pipework would have been full of water all the time, right up to the level of that wall outflow and probably why it leaked everywhere, by the looks of it and the tape etc.

 

[opps]

Yes - but for what you need it to do and if you're only lightly using it then this would do as equally as well - if you think you may have the need to use it in the future.

Draper Storm Force SDS+ Rotary Hammer Drill, 900W

Features:• 3 functions - Drill, Hammer and Chisel• Safety clutch• Depth rod• Supplied with adjustable side handle, 2 x SDS+ chisels, 3 x SDS+ drill bits and 2.2m cable with BS Plug • No load speed 850rpm • Max impact rate 4100bpm • Impact joules 4J • Drilling capacity masonry 26mm • Drilling...

www.toolstation.com

Minotaur Diamond Core Drill Bit Set

For fast, clean cutting and drilling in masonry, bricks or blocks, look no further than this Minotaur diamond core drill set. Supplied with accessories and a handy carry case, you'll be ready for a range of jobs - the kit includes 38mm, 52mm, 117mm diamond core drill bits suitable for wet and...

www.toolstation.com

If you wouldn't use it again then hiring would be the cheapest, less wasteful, option


Yes - as you can see from the pic the waste outflow is almost at the same height as the bottom of the sink waste - no way any correct waste trap set up would reach that if it is to work correctly. That was the failing of the last one - the homemade u bend and then a pipe that travelled up too high, which meant that the whole sink waste pipework would have been full of water all the time, right up to the level of that wall outflow and probably why it leaked everywhere, by the looks of it and the tape etc.

That drill- it is the first SDS drill I have seen which uses a separate control to turn off the rotation.

https://s3-eu-west-1.amazonaws.com/cdn.production.aws.eu-w1.pimberly.com/public/asset/raw/5c49d364cea10b002eb87a28/9eb95ac0/5c9f6d98afa5480011680be9.pdf