Shortly after construction properties should be monitored to confirm the effectiveness of the Radon barrier.
A study* has indicated that in as much as 60% of new build properties the installed Radon barrier does not result in Radon levels below Action Levels.

RPmatters can provide detectors to measure Radon levels and develop cost effective schedules and protocols.

* Denman, A.R., Phillips, P.S., Groves-Kirby, C.J. and Crockett, R.G.M. Do radon-proof membranes reduce radon levels adequately in new houses? Proceedings of the seventh International Symposium of the Society for Radiological Protection © SRP, 2005