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Visqueen Radon Sump should be used  where sub floor depressurisation is required. In the UK this is usually a requirement in Full Protection areas.

  • Strong & Robust
  • Easy to Install
  • Part of the Visqueen Radon Protection System
  • 450mm x 450mm

This is a prefabricated plastic sump, to which pipework is connected, with the joints fully sealed using the Visqueen Radon Membrane Jointing System.

A venting pipe should be connected to the sump, pass through the external wall and brought out above ground level about 100mm from the face of the external wall. The pipe is then capped until such time as a fan is installed.


A sump is only installed as a fallback measure and does not provide any radon removal until a fan is installed or, if the sump is located centrally, the pipe is connected to a passive stack system. Typically sumps are installed at one unit per dwelling or every 15m radius.

We have Visqueen Radon Membrane in stock for immediate despatch.

Excavate a pit for the sump, ensuring that, for maximum depressurisation, any fill used beneath the slab does not contain excessive fines. Connect a 110mm diameter PVC-U pipe to one outlet of the sump.

Extend the pipe horizontally so that it passes through the external wall. Ensure that all joints and couplings are airtight. Backfill using a clean permeable material without excessive fines. 

Terminate the pipe just above ground level, and cap it. It will then be ready for extension to form a vent if necessary.

Position the capped section of pipe so that it is about 100mm from the face of the
external wall. This will allow space to accommodate a fan if necessary. Provide a plate on the wall to indicate the presence of the radon exhaust pipe.

Visqueen is the market leader in the manufacture and supply of structural waterproofing and gas protection systems. 

They offer complete support at every stage in the specification and supply chain process. Working to only the highest standards and through innovation and excellence as key values, 

Visqueen remains the industry leader and is trusted as the technical authority for product standards.

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