Leaking Cast iron joint repair

[Dingdangdo]

Hello folks.

I've got a joint on my cast iron down pipe. I had a new bathroom fitted a few years ago and the fitter replaced some of the pipe with plastic and connected it to the cast iron down pipe. A few years ago I noticed a small leak so scraped all the joint out and used plumbers putty to create a new seal. I've just had the house re rendered and it's leaking again so feel the pipe must have been disturbed with them knocking the old render off. Is it a case of repeating the process or is there something it there better than using plumbers putty to create a better seal. All I did last time was to push the putty into the seal. DIY novice.

 

[Wayners]

Black polymer to match colour as I assuming its black. Use masking tape around the area. Apply polymer mastic. Pull tape. Snag up/smooth edges.

Might need to remove old putty. Meths

 

[HERTS P&D]

Pictures would help.

Andy

 

[Dingdangdo]

 

[Wayners]

That's the wrong fitting. Gravity means the bottom seal should be inside the joining pipe.
Where is it leaking?

 

[HERTS P&D]

As above, dig out the putty and use:

Stixall Adhesive & Sealant

Bond and seal virtually everything to anything with Stixall Extreme Power adhesive and sealant. The high strength glue is a versatile nail replacement solution with hybrid PMS polymer technology, and it's specifically designed to stick together most common construction materials. From jointing...

www.toolstation.com

Andy

 

[Dingdangdo]

That's the wrong fitting. Gravity means the bottom seal should be inside the joining pipe.
Where is it leaking?

At the bottom I think

 

[Wayners]

If the mood takes you get rid of all the cast iron. For now use polymer

 

[Bod ...]

The leak would more than likely be the bottom end of the plastic 45.

If you wanted a fix that looked in tune with the cast iron? Use a timesaver coupling and an M& F 45.

You can get cast effect plastic fittings or you could paint with Hammerite

 

[Dingdangdo]

Thanks for your responses