Suspected leaking pipe in concrete floor

[OffshoreGas]

Sadly I think you’re in for a world of pain here.

You really need a damp proof membrane tied into the DPC within the walls to fit solid flooring.

I know most manufacturers will say you can use a vapour barrier but you just end up moving the problem elsewhere.

 

[Last Plumber]

Am I missing something here?
Why have you not exposed the pipes to rule them out or repair them?

 

[Aire]

If it's a combi is there any constant pressure loss?

 

[Jim09876]

I don't get it?

Because it’s one of those jobs...there’s no easy way out. Everyone knows it, even the OP deep down knew it. I found humour in the cold hard logical truth of your answer.

 

[offgridman]

If pipes have corroded due to being buried in concrete, then be prepared for them to be fragile when exposed. You need force to break concrete, but corroded pipes dont like force. If lowering pressurw issues indicate pipe leak , then best advise client of worst case scenario.
Dig up floor, replace or reroute pipes as needed. Its not your fault if problem has occured in awkward place, and under expensive floor covering, unless you screeded over the pipes in the first place. Be honest with the client and ask them not to shoot the messenger.
Good luck

 

[OffshoreGas]

is it cheaper/easier/possible to just abandon the existing pipes? Run new pipework that’s not buried in concrete?

 

[Rob Foster]

Some people say copper pipe is NOT corroded by lime or cement and wrapping pipes is to allow them to creep during expansion and contraction so painting them with gloss paint etc is no good. centralheatking

 

[Aire]

Some people say copper pipe is NOT corroded by lime or cement and wrapping pipes is to allow them to creep during expansion and contraction so painting them with gloss paint etc is no good. centralheatking

Yep, I'm one of those people. I'm not sure if the copper corroding is an old wives tale that's been carried on through generations of plumbers but the wrap/sleaving is to protect against abrasion caused by thermal expansion and contraction.