Hi there, just wondering if somebody could guide me on the most suitable type of a radon barrier to use. i've phoned a few local stores this morning getting prices and ended up totally confused!!!! i was quoted 230euro for a 100sqm roll of reinforced radon and 93euro for an 80sqm roll of non reinforced whilst 35euro per roll for 1200g polythene. i thought that polythene could be used as a dpm but i wasnt aware it could also be used as a radon barrier our house will be 296sq, could anybody please tell me whats the best practice method and also inform me if the dpm is laid directly on top of radon barrier, thanking you in advance for your attention