Skillflex Rn 4 mm bitumen elastomer is a polymer membrane made for protecting buildings from radioactive gas. It is reinforced with a metal foil, coupled with a rot-proof fibreglass mat, which helps to make it an almost impenetrable Radon barrier. Radon is a natural radioactive gas, produced by radioactive decay of materials such as uranium, thorium and actinium. Radon 220 is one of the decaying elements; it decays for the most part in the environment in which it is present, producing radioactive metal isotopes which penetrate into the respiratory tract, irradiating it. Radon is odourless, colourless and has been found in many homes in many regions of Italy, particularly in Lombardy, Veneto and Lazio. It comes from underground and is concentrated especially in basements. A good protection system is represented by laying a sealing membrane to prevent the passage of the gas. The solution offered by Nord Bitumi to protect your home from Radon is Skillflex RN 4 mm, an elastomeric polymer bitumen membrane, reinforced with a metal foil, coupled with a rotproof fibreglass mat. Continuity of the Radon barrier is accurately achieved by carefully bonding the membrane overlaps by flame.