Outside kitchen-sink drain pipe corroded

[Hugh Jaleak]

Polypropylene pipework, that's the effect of UV in sunlight over the last 40 odd years. Only solution is to replace, you wont patch it up as whats left will be too brittle to support tape or any sort of repair. Unless you know the manufacturer it'll be hit and miss trying to get anything compatible with whats left, so you'll need to renew it back to a point where old and new can be joined. Where does it run to the other side of the wall?

It is advised to paint all exterior plastic pipework with a suitable gloss paint to protect it from the UV in sunlight.

 

[23vc]

I did the same for a mate a couple of years ago with a similarly degraded plastic pipe.
I reckon it was the really early plastic whenever that came out (70s?)
replaced it with solvent weld. Peice o’cake, took about as long as drinking 2 cups of tea. Pointless trying to seal it up, it’s knackered

 

[Jeff543]

I did the same for a mate a couple of years ago with a similarly degraded plastic pipe.
I reckon it was the really early plastic whenever that came out (70s?)
replaced it with solvent weld. Peice o’cake, took about as long as drinking 2 cups of tea. Pointless trying to seal it up, it’s knackered

Yeah early mid 70s it was built.

You replaced it? So you sawed off the original pipe and then just pipe fitted new pipe using solvent weld? But could I screw in and connect a new pipe?

 

[Jeff543]

Polypropylene pipework, that's the effect of UV in sunlight over the last 40 odd years. Only solution is to replace, you wont patch it up as whats left will be too brittle to support tape or any sort of repair. Unless you know the manufacturer it'll be hit and miss trying to get anything compatible with whats left, so you'll need to renew it back to a point where old and new can be joined. Where does it run to the other side of the wall?

It is advised to paint all exterior plastic pipework with a suitable gloss paint to protect it from the UV in sunlight.

It's the kitchen sink pipe.

 

[Jeff543]

Lucky for you it is push fit and looks to be 40mm, The only tools you will need is a saw to cut the new pipe to size, sandpaper to remove any burrs on the cut pipe and maybe a smear of washing up liquid to grease the push fit joints.

So just saw off the old pipe and push fit a new pipe in? There's no connection to screw a new pipe into.

 

[Jeff543]

Easy enough, 90° bend and length of pipe maybe a couple of pipe clips.
If the pipe is rotten going through the cavity it will need replaced as well...if you are lucky it may twist out in one piece once disconnected from the sink.

it looks like there's hardly anything to be able to connect a new pipe to once i get rid of the rotted part. .

 

[just pumps]

it looks like there's hardly anything to be able to connect a new pipe to once i get rid of the rotted part. .

You have to cut back to good or replace it all.

 

[23vc]

Yeah early mid 70s it was built.

You replaced it? So you sawed off the original pipe and then just pipe fitted new pipe using solvent weld? But could I screw in and connect a new pipe?

repaced the whole lot from kitchen sink trap. Just went straight out the trap, couple of offset bends and through the wall. V quick and easy

 

[Hugh Jaleak]

Put up a pic of where it goes inside the house and we can advise on your best course of action.

 

[Jeff543]

A local builder has offered to do this job but he says he doesn't need access to the kitchen. Is that possible?

Thanks.

 

[Ian H]

Maybe, unless the horizontal piece through the wall is knackered too.

 

[Jeff543]

Maybe, unless the horizontal piece through the wall is knackered too.

It's been replaced, as follows;

 

[Hugh Jaleak]

Looks ok, I'd just ensure the joint where it goes into the wall isn't leaking.

 

[23vc]

Tell him to swap it for white to match the existing

 

[CBW]

Tell him to swap it for white to match the existing

Also looks like it’s going the same way.