Contents

31.1 Introduction 1253

31.2 Source of Radon and Its Control 1255

31.2.1 Source of Radon 1255

31.2.2 Radon Entry into Buildings 1257

31.2.3 Radon Control in New Construction 1258

31.2.4 Recommendations 1265

31.3 Soil Depressurization 1267

31.3.1 SSD Overview 1267

31.3.2 SSD Systems 1269

31.3.3 Crawlspace Postconstruction Alternative 1272

31.4 Mechanical Barriers 1273

31.4.1 Foundation Materials 1274

31.4.2 Common Masonry Wall Details and Their Impact on Radon Resistance . . . 1275

31.4.3 Floors in Basements, Slabs on Grade, and Crawlspaces 1276

31.4.4 Crawlspaces 1281

31.4.5 Coatings 1282

31.4.6 Membranes 1284

31.4.7 Mechanical Barriers Applied to the Soil 1286

31.4.8 Drainage Boards for Soil Gas and Radon Control 1286

31.4.9 Summary of Recommendations for Mechanical Barriers 1286

31.5 Site Evaluation 1287

31.5.1 Radon in the Soil 1288

31.5.2 Radon Observed in Nearby Buildings 1293

31.5.3 Airborne Measurements 1293

31.5.4 Radon in Water 1294

31.5.5 Radon in Building Materials 1294

31.6 Planned Ventilation: Mechanical Systems 1294

31.6.1 Interdependence of Mechanical Systems and Climate 1295

31.6.2 Guidelines for Planning Mechanical Systems 1295

31.6.3 Two Illustrations 1297

31.6.4 Conclusions 1298

References 1299

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