1.1 This guide covers design and construction methods for reducing radon entry into new low-rise residential buildings, and methods for facilitating postconstruction radon mitigation.

1.2 These methods are based on radon mitigation procedures that have been used successfully for various foundation types, and include options to accommodate regional construction practices and site conditions.

1.3 These methods should not be considered as the only acceptable methods available to reduce indoor radon levels, and are not intended to preclude or limit the use of other effective options.

1.4 This guide is intended to assist designers, builders, building officials and others involved in the construction of low-rise residential buildings.