Suspended ground floors


Suspended ground floors shall be designed and constructed to ensure that adequate measures are taken against the adverse effects of ground contaminants, including adequate protection against radon gas.

Any contaminants in, or above, the ground should be identified to the satisfaction of NHBC, following the guidance given in the appropriate British Standard, and precautions against health hazards caused by contaminants should be taken.

Precautions acceptable to NHBC may be necessary to reduce the entry of radon gas; such conditions should be identified in the site investigation.