Radon Gas : The Facts - From the Radon Gas Experts Envirowise

Under-floor extract and radon mini sumps work by creating lower pressure below floor level
which reduces the ingress of radon gas into the building. This system uses an electrically
powered radon sump fan that sucks the gas from underneath the floor of a house, either
from an existing void under the floor or a new mini sump, and vents it into the atmosphere
through a pipe. Developed primarily for houses with solid floors, radon sump pumps can be
used in houses with suspended floors depending on the construction of the floor and existing
airbricks.

Sump fans can be installed externally or internally.

Airflow under suspended floors also can be increased by installing vents. This method has been proven effective on radon
levels of up to 700 Bq m3 in some cases and can be improved by adding fans to create greater movement of air.

Positive pressure systems draw radon free air from the loft space or directly from outside, via a positive pressure ventilation
unit installed in the loft space in a house, or on an internal wall in a flat, and dilutes the air throughout the property thereby
reducing radon levels. These systems are effective for up to 500 Bq m3 levels of contamination and work better in sealed
environments. They also have the additional benefit of greatly improving air quality and reducing condensation problems.

Most new houses incorporate preventative measures that control radon and advice on appropriate action to minimise
radon is often available from local councils in conjunction with the BRE (Building Research Establishment).

Envirowise offer professional radon protection and remedial services covering surveying, monitoring and detection through
to the recommendation and installation of devices that reduce the presence of the gas.


For Further information on Radon Gas and the solutions available visit www.enviropropertycare.co.uk
or call 0800 288 8661

Timberwise are Experts in Rising Damp, Damp Proofing, Basement Waterproofing, Condensation Control, Dry Rot,
Woodworm, Radon Gas and all aspects of property care. With UK coverage you are never far from
Timberwise! Call 0800 99 11 00 or visit www.timberwise.co.uk



© Timberwise (UK) Ltd 2009
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