Impacts of a Sub-Slab Aggregate Layer and a Sub-Aggregate Membrane on Radon Entry Rate: A Numerical Study

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A subslab aggregate layer can increase the radon entry rate into a building by up to a factor of 5. We use a previously tested numerical technique to investigate and confirm this phenomenon. Then we demonstrate that a sub-aggregate membrane has the potential to significantly reduce the increase in radon entry rate due to the aggregate layer, even when a gap exists between the perimeter of the membrane and the footer. Such membranes greatly reduce diffusion of radon from the soil into the aggregate and are impermeable to flow. Radon entry through the basement floor slab is limited to radon ... continued below

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Bonnefous, Y.C.; Gadgil, A.J.; Revzan, K.L.; Fisk, W.J. & Riley, W.J. January 1, 1993.

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A subslab aggregate layer can increase the radon entry rate into a building by up to a factor of 5. We use a previously tested numerical technique to investigate and confirm this phenomenon. Then we demonstrate that a sub-aggregate membrane has the potential to significantly reduce the increase in radon entry rate due to the aggregate layer, even when a gap exists between the perimeter of the membrane and the footer. Such membranes greatly reduce diffusion of radon from the soil into the aggregate and are impermeable to flow. Radon entry through the basement floor slab is limited to radon entry through the holes in the membrane. In addition, a sub-aggregate membrane is predicted to improve the performance of active sub-slab ventilation systems and makes passive systems more promising.

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  • Indoor Air '93, The Sixth International Conference on Indoor Air Quaility and Climate, Helsinki, Finland, July 5-8, 1993

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  • Report No.: LBL-33687
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 939472
  • Archival Resource Key: ark:/67531/metadc894712

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  • January 1, 1993

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  • Sept. 27, 2016, 1:39 a.m.

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  • Jan. 4, 2017, 5:51 p.m.

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Bonnefous, Y.C.; Gadgil, A.J.; Revzan, K.L.; Fisk, W.J. & Riley, W.J. Impacts of a Sub-Slab Aggregate Layer and a Sub-Aggregate Membrane on Radon Entry Rate: A Numerical Study, article, January 1, 1993; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc894712/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.