Hi,
As per Jollyman, there are 2 radon barriers you can buy.
there is a state of the art roll whick is red in colour and it has nylon thread through it to prevent tears. This comes in a roll approx 4 M X 25 (covers approx 1000 sq feet). I think I payed approx 300 euro for a roll inc vat. However there is another type whick is yellow in colour, with no nylon thread for a fraction of the price. This is easily torn and will not cope with any traffic at all.
Do not confuse these radon Membranes with damp proof membrane. Damp proof membrane will only stop damp but not Radon.
Out of this I have a question for some of you that may have been down this road.
I have my sub floor in and house built to first floot. I put in Radon barrier and 150 mm of concrete. After roof and windows go in I will then put down DPM in each room and run it up the wall about 200mm (cut after), then 50 mm of Kingspan and pin my underfloor heating to it, and pour a 75 mm screed to finish it.
My question is the 150mm of concrete between is between the radon layer and the DPM. If this 150mm is damp etc etc, the water will evapourate and then condense again at the DPM level as it cannot escape. Is this an issue??? I know if I let the slab dry after putting on the roof this should not be an issue. Just wondering I am doing this correctly.
Than for your help on this.