![]() The gas then escapes from the building trough conduits (d). Through little holes (a) in the foundation, the radon pump (b) creates lower pressure below the foundation (c). This is why it was clear from the very beginning that we had exactly one chance to apply a viable solution.” Tiny holes, major impact Michael Myntelius, COO at Radonkonsult, says: “After several failed attempts, the library management could no longer afford to experiment. Through a trade fair contact, the library found Radonkonsult, a company that has specialized in protection against radon for decades. One company sealed all the cracks and seams in the basement and another tried to slightly over-pressurize the air throughout the library. While seeking a solution to the problem, the library management collaborated with various service providers. The librarians were prohibited access to thousands of books. The library immediately declared the archive in the basement a taboo zone. The legal limit value in Sweden is 200 Bequerel per m3. ![]() A legally proscribed energy check revealed that the radon concentration in the building’s archive was 2,000 Bequerel per m3. It becomes concentrated in indoor air and quickly achieves dangerously unhealthy levels - which is what happed in the Stockholm City Library. The gas becomes a hazard as soon as it penetrates the buildings foundations and enters the buildings. ![]() Access was forbidden due to the high radon levels.īut radon occurs naturally in many types of soils. The archive of the library was a taboo zone for a long time. ![]()
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