During Construction: You should make provision for an active protection measure by installing radon sump and connecting pipework.
You should make provision for subfloor depressurisation by installing a radon sump/s and network of pipes during construction as highlighted in the Irish Building Regulations 1997- 2008 Technical Guidance Document C (Section 2).
Sub-floor depressurisation, also called sub-slab suction, is a most effective way of reducing radon levels should the need arise at any time over the lifecycle of a building.
By installing a radon sump under a ground floor slab a void is provided from which radon can be drawn by use of an extractor fan; this lowers the sub-floor air pressure relative to that indoors. The radon gas is sucked from below the floor and vented by an external pipe to the air above the building. The radon is quickly diluted and will cause no further harm to health.
As radon levels are generally established when a building is completed and may alter over its lifecycle due to change of use e.g. the reduction of ventilation or the addition of extensions, the installation of a radon sump and pipework at construction stage is easy and inexpensive and a useful precaution even if never used.
Note: The radon sump and pipework do not provide any radon removal until a fan is fitted to an external vent pipe, and the system is activated.
The Easi-Sump provides the void under the ground floor slab from which radon soil gas can be extracted.
And at ground level outside the building the Easi-Sump Cap-Link terminates, and securely caps, the pipework leading from the sub-floor Easi-Sump. It is the ‘clearly identifiable’ Radon Sump Connection Point should the extraction system ever need to be extended above roof level and activated in the future.
Key Components: You should use an Easi Sump & Easi-Sump Cap-Link which are certified by NSAI Agrément Board Certificate No. 09/0238.