How repair dpc in concrete floor

[Johnboy54]

Hello to all.
I'm installing a downstairs wc on the opposite side of the room to the soil pipe.
I'll dig a channel out of the concrete floor to lay the pipe, but how do I repair the concrete to make sure damp doesn't rise?
Thank you.
John

 

[mattysupra]

dig down but be carefull not to damage dpm. you will need to split the dpm down the middle so you end up with lets say 2x 6" flaps of plastic. Put your pipe in and bed with sand etc. Rejion the dpm with a waterproof tape or epoxy and refill with cement/concrete

 

[Richard C]

You could use a liquid DPM like Aquaseal

 

[mattysupra]

You could use a liquid DPM like Aquaseal

for the op, liquid dpm is the same as epoxy!

 

[Johnboy54]

Thanks for the replies.
The house is very old, so I don't know if there's a membraine or not until I start digging. My present house - 50 years old - doesn't. It has an epoxy? screed. Its like bonfire toffee when you break into it!
If it's membraine, I'll follow your advice.
If not, I'll fill with epoxy.
Either way, I'm now sorted.
Thanks again.
John.