Cut Cast Iron Elbow To 40mm Waste Pipe Connection

[MrMiller]

...Your application wouldn't really need any shear protection as it shouldn't be experiencing any significant lateral loads nor should there be any danger of the vertical cast slipping down putting load onto the coupler.

Thanks, that's actually a great point. I also meant to say in my last post that the toilet soil pipe feeds separately into the main sewer line, so there shouldn't be any danger in it having backed up water sitting there...

My only other concern using that reducer without a shear band is rodents potentially chewing at it. I've read some comments about that being a problem. Would it be any idea to wrap the reducer in wire wool or suchlike?

 

[Madrab]

Nope - you may be overthinking it a little. No real reason for rodents, especially up in that location, to be gnawing at a Fernco adapter.

 

[MrMiller]

Just adding the current state of play here in case anyone else stumbled into this thread having similar problems.

Here's the original picture of the lead waste pipe under the bath:-

It cut no problem with a basic reciprocating saw metal blade. I cut it at the join for the sink waste and roughly where it says "bath". Once I got the bath out the way and water capped, I just pulled at it and twisted - It came right out!

I have no idea if it was attached to cast iron at all (!) but it's clearly crumbled away at the side closest in the picture, which was between the inside and former outside wall...

 

[Madrab]

That'll be where the leak was at then presumably, the lead to cast connection was probably on it's last legs and was just holding onto the cast connection inside the wall.

 

[MrMiller]

That'll be where the leak was at then presumably, the lead to cast connection was probably on it's last legs and was just holding onto the cast connection inside the wall.

Yup, looks like it - The pipe was otherwise fine. Would be interesting to know how that connection was done back in the day. I just pulled and twisted at it but it came easily. It has sheared though, so there must have been some kind of connection - don't know if would have just been soldered and that's where it failed. I guess I may get some further clue when I cut the cast iron on the other side.