Advice please!!

I have a 32mm waste pipe from a sink joining a 110mm vertical soil pipe with a strap on boss. The joint is leaking between the boss face flange and the soil pipe surface.
The joint is under the first floor floor panels, in a corner against blockwork, between joists, there is another strap on boss adjacent plus hot and cold water pipes - access is extremely limited!! I can't see or feel the strap on tightening fixture to adjust.
Is there a sealant that I can put over the joint? would a long jubilee clamp (if I can thread it through!) plus a sealant secure the leak? The sink waste can be very hot so I am assuming some flexibility may be required.
The soil pipe continues downstairs and is boxed in, the leak has damaged the carpet and removing the box-work and coving has damaged the decoration so I am looking for a good long term secure fix!
Any advice welcome, thanks, John.

 

Thanks, I'll try and light the area and get some taken.
Cheers

 

Hi Terrymac. The first picture shows the area where the joint is. To the left and behind is the block wall, on the right is the floor paneling. The waste line is white.
The second close up of the join shows the strap on fitting. While the 32mm is chipped where it connects to the boss that's not the leak. The leak is between the face of the boss flange and the 110mm soil pipe at the underside.
The light below is coming up from the room below through the ceiling. I can cut the ceiling back a bit more which would give about 3" more access on two sides.
Cheers
John

 

I'd need to check the wording of the policy. If it's beyond my skills and I actually need to renew the soil pipe I'd have to call in the experts. It would be a fairly major undertaking to fit new, reconnect all, repair floors, refit toilet and hand basin, box in, repatch plaster and coving and redecorate!!
Plus with the current lockdown I'm in 12 week isolation as extremely vulnerable it could all become a pain in the derriere!
Thanks
John

 

I can post larger images if required.
John

 

I've just modified a small garden tool handle to hold a hold a cut off hacksaw blade (where would we be without bits of hacksaw blade!) so I can cut more of the ground floor ceiling away in a tidy fashion, that will give easier and probably all round access to the joint.
If I clean thoroughly with white spirit and leave to dry then use a solvent cement you think it may "rebond" the two together?
What solvent cement would you recommend? It's not something I've used before and I'll have to find on line.
Thanks
John

 

Thanks Teki - I see neither are available for delivery! I will have a look for something similar where they might deliver or else persuade a friend to drop in and pick up from my local Screwfix.
John

 

Thanks Terrymac. I'll order some, prepare the area, clean and apply. The crack appears to be very narrow, when I cut away the ceiling I'll get a better idea, but I'd suggest 0.2mm-ish, I suspect it opens with the hot water.
It'll take a day or two to source. apply and test but I'll report back in due course.
Thanks to all.
John

 

Thanks Teki

 

It will mean removing the hand-basin and pedestal and cutting out a section of floor. I was thinking of rerouting this anyway as it is soooo rigidly fixed I suspect that any movement from expansion due to hot water must be putting pressure on the strap on boss.
john

 

Thanks Terrymac - job done and watertight again. I did reroute part of the 32mm waste line to allow it some more play.
Cheers, John.

 

Cheers, thanks for the advice, job done!
John