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TESTING OF INDOOR RADON REDUCTION TECHNIQUES IN CENTRAL OHIO HOUSES: PHASE 2 (WINTER 1988-1989)
Citation:
Findlay, W., A. Robertson, AND A. Scott. TESTING OF INDOOR RADON REDUCTION TECHNIQUES IN CENTRAL OHIO HOUSES: PHASE 2 (WINTER 1988-1989). U.S. Environmental Protection Agency, Washington, D.C., EPA/600/8-90/050.
Description:
The report gives results of tests of developmental indoor radon reduction techniques in nine slab-on-grade and four crawl-space houses near Dayton. Ohio. he slab-on-grade tests indicated that, when there is a good layer of aggregate under the slab, the sub-slab ventilation (SSV) mitigation technique, with only one or two suction pipes, can generally reduce indoor concentrations below 2 p Ci/L (86 to 99% reduction). hese reductions can be achieved even when: there are forced-air supply ducts under the slab; the slab is large (up to 2600 sq ft); and the foundation walls are hollow block. perating the SSV system in suction always gave greater reductions than did operating in pressure. he crawl-space tests demonstrated that depressurizing under a plastic liner over the crawl-space floor was able to reduce living-area radon concentrations below 2 p Ci/L (8l to 96% reduction). he performance of such sub-liner depressurization gave better reductions than did crawlspace ventilation (blowing air into, or out of, the crawl space). ompletely coverin the crawl-space floor with plastic sheeting was not always necessary to get adequate performance.