Kitchen sink waste advice
- Thread starter stevenaive
- Start date
Couldn’t find a T with inspection hole at Screwfix but did manage to procure a space gun to drill for the waste pipe.
First I bought the core bit and sds adaptor.
Then went back and bought the pilot drill that didn’t come with the core bit.
Also had to get a comedy length 8mm masonry bit to pre drill from inside. Oh and it knocked off a big chunk of the brick.
Gave up core drilling after about ten minutes as I’d only gone through about half a brick and my arm was falling off.
First I bought the core bit and sds adaptor.
Then went back and bought the pilot drill that didn’t come with the core bit.
Also had to get a comedy length 8mm masonry bit to pre drill from inside. Oh and it knocked off a big chunk of the brick.
Gave up core drilling after about ten minutes as I’d only gone through about half a brick and my arm was falling off.
You need a Tee and a Cleaning Eye. Fit Cleaning eye into unused socket of the Tee. https://www.bes.co.uk/polypipe-40-mm-white-swept-tees-91-1-2-solvent-11816/ and https://www.bes.co.uk/40-mm-screwed-access-plug-solvent-white-11861/
(Unless you're using Compression or Push Fit waste, in which case you can dismantle things if need be!)
Cant help with the drilling, a lot will depend on the hardness of the brickwork you're trying to get through!
(Unless you're using Compression or Push Fit waste, in which case you can dismantle things if need be!)
Cant help with the drilling, a lot will depend on the hardness of the brickwork you're trying to get through!
Welcome to deaf'n'dumbing
As said, a swept tee and a cleaning eye.
Always drill from outside in with brickwork
Try a 6inch core 10feet up a ladder through wet bricks
No chance I’m going up a ladder to do the new shower waste pipe. Will have to get a man in. 
Back on the drilling this morning. Core bit stuck in the wall, creating its own tool holder. Going against all advice I’ve upped the speed and put my hip behind it, otherwise it’s a jittery mess that barely moves. Should be through next Tuesday.
Oh Lordy, I’m through! Giving it a bit of welly and riding the clutch proved successful. Will go inside now and hope it’s a tad easier to meet up in the middle.
Have it..!
Back on the drilling this morning. Core bit stuck in the wall, creating its own tool holder. Going against all advice I’ve upped the speed and put my hip behind it, otherwise it’s a jittery mess that barely moves. Should be through next Tuesday.
Oh Lordy, I’m through! Giving it a bit of welly and riding the clutch proved successful. Will go inside now and hope it’s a tad easier to meet up in the middle.
Have it..!
Last edited:
Okay everything is connected now and no drips, drains perfectly. Thanks!
But now I’ve got to finish off the waste pipe going into the drain, which is offset from the wall (no idea why). The elbow joint I’m using makes the pipe sit a good inch off the wall, so the fasteners don’t work unless you bend the pipe. One fastener, half way, would be fine but even that would take the end of the pipe closer to the wall and off the drain.
My preference is to buy a new drain grid with an access hole for the pipe to go straight down - far enough off the wall to reach the drain cover but still able to be tied to the wall. Confused? Me too.
But now I’ve got to finish off the waste pipe going into the drain, which is offset from the wall (no idea why). The elbow joint I’m using makes the pipe sit a good inch off the wall, so the fasteners don’t work unless you bend the pipe. One fastener, half way, would be fine but even that would take the end of the pipe closer to the wall and off the drain.
My preference is to buy a new drain grid with an access hole for the pipe to go straight down - far enough off the wall to reach the drain cover but still able to be tied to the wall. Confused? Me too.
Leave it until it declares it's not happy!
But get it clipped to the wall.
But get it clipped to the wall.
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Either use spacers for the clips or buy some fittings the same type of pile, eg solvent weld and offset back to the wall if possible.
Solvent Weld Fittings will be a lot slimmer, and should allow you to sit the pipe closer to the wall. Will be easier to make good as well. Otherwise, use short pieces of 15mm Copper Tube as spacers.
Should be able to get a Plastic Grid that size, cut a section out as required to incorporate your pipework.
Should be able to get a Plastic Grid that size, cut a section out as required to incorporate your pipework.
Thanks again for all the advice, chaps. My sink is finally working like a sink after 10 years of bodged madness.
Just in case anybody reads this in the future and wants to know: I have since core drilled for a bathroom shower waste. I couldn’t carry the SDS drill up a ladder safely so used an 18v (small) cordless drill and it worked almost as well as the big brute. You’re not meant to push too hard anyway so shouldn’t be surprised, really. Had to do it over a couple of days mind you.
Just in case anybody reads this in the future and wants to know: I have since core drilled for a bathroom shower waste. I couldn’t carry the SDS drill up a ladder safely so used an 18v (small) cordless drill and it worked almost as well as the big brute. You’re not meant to push too hard anyway so shouldn’t be surprised, really. Had to do it over a couple of days mind you.
If you're keeping the compression elbow then paint it with an oil based paint. PP/PB doesn't like sunlight and it will break down over the years to come.
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Off topic but just put a watersoftner into my utility, I can barely get my hand in there with the finished job but the Mcapline stuff saves the day reconstructing the waste around pipes. Learnt a lot about solvent weld as well, I've done my bathroom this year but only with swept tees and a tee off. Using the tight bend options for the sink was good to learn.
Sink (Astini Brand) connection was too big to connect to the mcalpine 40mm so needed Mcalpine to save the day again with an S12a converter. Surprised the Swedish sink didn't have that issue.
Sink (Astini Brand) connection was too big to connect to the mcalpine 40mm so needed Mcalpine to save the day again with an S12a converter. Surprised the Swedish sink didn't have that issue.
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