Sediment blocked waste pipe

[Serval]

Hi guys, ive got a couple of issues with this waste pipe:

Firstly, the elbow that exits the wall has got a crack on the top near the joint. you can see it to the right of the arrow in the pic. ( it doesn't go all the way round the pipe)

Around a year ago the down stairs flat owner told me the crack was leaking intermittently. On inspection it was just weeping....not gushing water.
I rubbed down the surface of the pipe ans sealed with this stuff which seemed to fix the issue

Recently the downstairs flat has complained the leak has come back and has been more regular. I guess the crack probably opened up again due to expansion/contraction. for a crack so high up on the pipe to leak suggests the pipe was blocked/slow draining so i got a plumber out who unblocked it from the rodding point. In doing he advised the flow line pipe was pretty heavily scaled up on the inside and needs de-scaling to prevent future blockages

Roughly How much would I be looking at to pay a plumber or drain specialist to get the flowline (approx 2 .5 metres) de-scaled?

If i got it de-scaled is there anything i can use to seal up the hairline crack more permanently to prevent any further weeping?

Alternatively, approximately how much would it cost for a professional plumber to get the entire section of waste pipe on the flowline and the cracked elbow replaced with new? (im aware that the elbow would need to be dug out of the wall making it a fairly involved job... Just wonder if its better to just replace if possible than try to repair)

Based in London so looking for approximate London prices.
Thanks all

 

[ShaunCorbs]

Tbh as it’s cracked I would replace the damaged part if it’s scaled up something else is wrong as plastic doesn’t normally scale up unless he means underground?

 

[Serval]

Tbh as it’s cracked I would replace the damaged part if it’s scaled up something else is wrong as plastic doesn’t normally scale up unless he means underground?

Thanks for the reply shaun
The cracked elbow is one thing, but he said as long as the pipe is flowing properly, the water level would never get to the top of the pipe to leak out

He referred cause of the block as a scale build up in his notes but on speaking to him i think its the result of a long term build up of sludge and debris which has hardened into a sediment build up reducing the diameter of the pipe causing reduced flow and snagging of paper etc

Edit.. Maybe im using the wrong terminology when mentioning descaling...just going of what he told me

 

[WC1]

Descaling isn't really a thing unless someone has put cement or plaster down it. Get him to show you a screenshot from his cctv if anyone else says that. As Shaun says defo get the leak fixed properly. You'd be very unhappy to have that dripping on you.

 

[Serval]

Cheers. Roughly how many hours labour would i be looking at to get the elbow and flowline replaced? Bearing in mind the elbow would need too be dug out of the wall to replace and the wall made good afterwards

 

[ShaunCorbs]

I would say / allow a days work including patching

 

[Serval]

Descaling isn't really a thing unless someone has put cement or plaster down it. Get him to show you a screenshot from his cctv if anyone else says that. As Shaun says defo get the leak fixed properly. You'd be very unhappy to have that dripping on you.

Cheers i dont think he used a camera tbh. Im assuming he could see it from the access hatch located at the elbow as that's the access point he used to unblock the soft obstruction from. (Would have done this myself but cant climb a ladder at the moment due to recent knee surgery)

I would say / allow a days work including patching

Thanks shaun