Radon protection for new domestic extensions and conservatories with solid concrete ground floors (GG 73 revised)

BRE (Building Research Establishment) is an independent, research-based consultancy, testing and training organisation, operating in the built environment and associated industries.

Radon protection for new domestic extensions and conservatories with solid concrete ground floors (GG 73 revised) was written by Chris Scivyer and published by BRE on 13 January 2015.

It replaces guidance published in 2008 and should be read in conjunction with BRE Report BR 211, Radon: guidance on protective measures for new buildings. Two companion Good Building Guides cover radon-protective measures for new dwellings and new large buildings such as workplaces.

Radon is a natural, colourless, odourless, radioactive gas formed by the radioactive decay of small amounts of uranium that occur naturally in all rocks and soils. It can move through cracks and fissures in the subsoil and eventually to the atmosphere. Most of this radon will disperse harmlessly into the outdoor air, but some will collect in spaces under or within buildings.

This 8-page Good Building Guide gives practical advice about the installation of radon-protective measures in new domestic extensions and conservatories with solid concrete ground floors. It will also help house owners and builders in radon-affected areas assess whether protection is needed for a new extension or conservatory and determine the level of protection that is required.

The contents of the guide are:

• What is radon and why consider it for new extensions?
• UK building regulations.
• Determining whether radon protection is needed.
• Protective measures-Basic radon protection.
• Radon barriers.
• High water table.
• Fill and blinding.
• Maintaining ventilation to existing suspended ground floors.
• Subfloor depressurisation and sumps.
• References.
• Further reading.

--BRE Group

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