How best to fix broken external downpipe from kitchen sink to outdoor drain

Hi, see pics below. I'm a bit of an amateur and was wondering how best to go about fixing this and what tools would be needed etc.

You can see at the point it exits the house, it turns 90 degrees and runs downwards for maybe 2m or so and goes into the external drainage point.

Some of the pics make the pipe look vertical but it's more horizontal, but sloped down to the drain.

Thanks

Cut it pasted the 90 degree joint where it comes out the wall, then replace from there with new pipe work to gulley.

Andy

HERTS P&D said:

Cut it pasted the 90 degree joint where it comes out the wall, then replace from there with new pipe work to gulley.

Andy

Click to expand...

thanks ... I'm a bit of a novice (to say the least) ... after cutting after the 90 degree joint, what mechanism do you suggest to fix the new segment of pipe to the old, or should i but a wider pipe and overlap them with the old pipe feeding into the new pipe a bit so the water runs down into the new one?

See below:

https://www.screwfix.com/p/floplast-straight-couplers-40-x-40mm-white-5-pack/58998

https://www.screwfix.com/p/floplast-solvent-weld-waste-pipe-white-40mm-x-3m/44310
(you might need 2 or 3 of these, depends on distance to gulley)

https://www.screwfix.com/p/floplast-bends-92-5-white-40mm-5-pack/92756

https://www.screwfix.com/p/floplast-bends-92-5-white-40mm-5-pack/92756

Plus a pot of solvent weld (glue)

And watch various videos on youtube

Andy

Where does it go inside the building? (Pics would help possibly.) Looking at the condition of it, the plastic has deteriorated over time following exposure to the elements, and has become very brittle. My only concern with trying to cut what's already there is it may shatter/split/break further. If you can attach to an existing section inside the building, (or replace completely from the sink), it may be easier than trying to attach to the outside section.

Plastic pipe manufacturers usually recommend their products are given a regular coat of gloss paint to protect them from the UV rays in sunlight which cause the plastic to deteriorate.

Andy has linked you to what you require, waste is fairly simple to work with. Cut to length required, advise assemble dry to check run. Once complete and you're happy, you can make the joints.

Deburr and clean mating surfaces. Give both pipe and socket a coat of solvent weld adhesive. Push together, wipe off any excess glue. Be aware though joint will set in seconds, so you need to get it right first time. Pencil mark across fitting and pipe helps here, simply align both when making the joint.