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DESIGN AND TESTING OF SUB-SLAB DEPRESSURIZATION FOR RADON MITIGATION IN NORTH FLORIDA HOUSES - PART I. PERFORMANCE AND DURABILITY - VOLUME 1. TECHNICAL REPORT
Citation:
Roessler, C., R. Morato, R. Richards, H. Mohammed, D. Hintenland, AND R. Furman. DESIGN AND TESTING OF SUB-SLAB DEPRESSURIZATION FOR RADON MITIGATION IN NORTH FLORIDA HOUSES - PART I. PERFORMANCE AND DURABILITY - VOLUME 1. TECHNICAL REPORT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/149a (NTIS 96-103585), 1995.
Impact/Purpose:
informaiton
Description:
The report gives results of a demonstration/research project to evaluate sub-slab depressurization (SSD) techniques for radon mitigation in North Florida where the housing stock is primarily slab-on-grade and the sub-slab medium typically consists of native soil and sand. Objectives were to develop and test the use of a soil depressurization computer model as a design tool, to optimize the SSD design for North Florida houses, and to observe the performance and durability of the installed systems. Between May 1989 and August 1990, SSD systems were designed and installed in nine houses: seven with simple rectangular floor plans and two with more complex, L-shaped designs. Installations included a single-suction-point system in one house and two-suction-point/single-fan systems in eight houses. The installation in one of the larger, L-shaped houses consisted of a single-suction-point system in addition to a two-suction-point/single-fan system. All systems used small diameter, nominal 50 mm (2 in.) piping. The mitigation successfully reduced indoor radon concentrations, originally on the order of 10-30 pCi/L, to post-mitigation values of <4 pCi/L in all nine houses. During the 3-18 months spent on durability observations, the systems retained effectiveness in maintaining reduced indoor radon concentrations.