Patch drain repair or full length lining

[Eric125]

Hi all, a recent CCTV survey has shown 5-6 areas of large joint displacement along an area of drain 5 meters in length. One company has said to do individual patch repairs. The other has said to reline that whole section. The 5 meter area also includes a 90 degrees bend around a corner of the property, again I got different views with one company saying that they will need to excavate the gully to access that side and the other saying that they can go around it using the manhole.
Are there any views on how to decide the best way to rectify the issue? Is there an advantage of the patch repair vs the whole pipe lining given that the latter seems to work out cheaper?
All the displacements are between RWG3 and RWG2 shown in the photo below.

 

[king of pipes]

Piece of mind is a wonderful thing I'd recommend replacing it all 5-6 suspect movements your chucking good money at bad otherwise, your home insurance will cover most of it anyway?? . Kop

 

[snowhead]

I've seen relining done and seen a lot of failures after, in Commercial systems.
I wouldn't go anywhere near relining unless you're going to employ the best in the Country and pay top prices, that's if you can figure out who is the best.

If you put a liner through a displacement you've still got a displacement but with a liner in it.

As k-o-p, if you've got that many displacements, especially in a relatively short section, then they'll be more on the way.
Is the rest of it all O.K beyond RWG2?
Rip it out and and go for new.

And it doesn't have to be like for like, you've got an end of a drain at RWG2 and you need a gulley, presumably to drain the front area, it just needs the easiest route between them

 

[Eric125]

I've seen relining done and seen a lot of failures after, in Commercial systems.
I wouldn't go anywhere near relining unless you're going to employ the best in the Country and pay top prices, that's if you can figure out who is the best.

If you put a liner through a displacement you've still got a displacement but with a liner in it.

As k-o-p, if you've got that many displacements, especially in a relatively short section, then they'll be more on the way.
Is the rest of it all O.K beyond RWG2?
Rip it out and and go for new.

And it doesn't have to be like for like, you've got an end of a drain at RWG2 and you need a gulley, presumably to drain the front area, it just needs the easiest route between them

I agree about replacing it been a better option however I don't think this is not an option at the front as the drain goes under the front steps and the kitchen that seats directly under them.

 

[Chuck]

I agree about replacing it been a better option however I don't think this is not an option at the front as the drain goes under the front steps and the kitchen that seats directly under them.

I'd want to understand the cause of the movement before proceeding. What sort of ground is the house built on, is there a tree nearby, sink holes, historic mining activity, etc? No point in spending a lot fixing a drain if the house needs underpinning!

All being well, I'd look into installing a soakaway of some type at the front of the house to receive from Gully 3 and then, it seems to me, the problematic corner and the section under the steps can be decommissioned.

I'm surprised that lining was suggested as a solution in the circumstances you describe, I'm not a drains specialist, but seems like the wrong tool for the job to me.

 

[oz-plumber]

From what I have gathered regarding the relining, it is regarded as a temporary repair.
It reduces the size of the drain, which then does not comply with regulatory requirements.
They are relining a drain that is faulty, and they are temporarily covering or coating the faults.

I would say at best, from experience, 50% success rate long term.

What material is your existing drain?

 

[Eric125]

From what I have gathered regarding the relining, it is regarded as a temporary repair.
It reduces the size of the drain, which then does not comply with regulatory requirements.
They are relining a drain that is faulty, and they are temporarily covering or coating the faults.

I would say at best, from experience, 50% success rate long term.

What material is your existing drain?

It is 150 year's old clay pipe..

 

[oz-plumber]

In that case, then I would say it's time to renew.

It will be expensive, but you will be doing the next owners a favour - for the next 150 years.

What is the depth of the drain?