Depth of damp proof membranes in concrete floor?

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I’ve recently bought a new house and my next task is to tidy up the heating pipe work. My house has solid concrete floors and I plan on burying the pipe using Hep2o pipe in pipe and their conduit junction boxes where necessary.

My only concern is the junction boxes are 75mm deep and I am worried I might pierce my damp proof membrane channelling down that far.

My house was built in 1970 so anyone have any ideas how far down the damp proofing might be?

Also what would happen if I pierced it, could it be repaired easily?

Thanks in advance for your help.
 
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If the membrane is foil-like in appearance and is woven with nylon fibres then it is a gas membrane.

This you will definitely want to repair. :eek:
 

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