Introduction

RADON-RESISTANT NEW CONSTRUCTION

INTRODUCTION

The best way to avoid high indoor radon levels is to implement simple radon-resistant construction techniques when the house is built. Use of all, proven, radon-resistant techniques normally results in a lower indoor radon environment. If the use of only passive soil depressurization techniques does not offer acceptable levels of indoor radon, it is easy and inexpensive to add a fan later.

In accordance with the Adopted Rule (licensing of Radon Detection & Mitigation Services 32 IL Administrative Code Part 422) individuals installing passive new construction systems or skeletal new construction system, are exempted from licensure.

Passive new construction means a system installed in new construction that relies solely on the convection flow of air upward in the vent pipe for sub-slab depressurization and consists of a vertical vent pipe routed through conditioned space from the suction pit to 12 inches above the roof (Adopted Rule 422.20).

Skeletal new construction system means a system installed in new construction that is designed for the installation of a vent fan and may consist of multiple vent pipes, including vertical and angled runs not necessarily routed through conditioned space that may be joined to a single termination above the roof or may terminate separately above the roof (Adopted Rule 422.20).

Like many other contaminants that originate outside, radon can be controlled by taking steps to stop or reduce entry into the home. The following approaches have been tried or suggested:

Reducing radon entry by installing barriers on any earth beneath the home and in the foundation to retard soil-gas entry.

Controlling the indoor-outdoor pressure relationship by depressurizing the soil under the slab (sub-slab depressurization) or in the crawl space (sub-membrane depressurization).