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Outlets and Entry Points

  • Material: polypropylene.
  • Colour: black.
  • Cavibricks and caviweeps are available in a range of colours.

This item is not available for online purchase



Discharge routes for arrested methane and radon gas. Discharge routes for water arrested by barriers. Sleeves for service entry points.


The introduction of gas control barriers in cavities dictates one installs means by which all arrested gas and water can be routed out of the structure. Additionally, where services penetrate any membrane or barrier the entry point must be suitably sealed. A range of accessories are available for this purpose: Cavibricks may be installed in the external skin under barriers to discharge gas in the cavity trapped below barrier level. Caviweeps may be installed within perp joints to discharge penetrating water arrested on the upper surface of the barrier. (drawing) Service Pipe Entry Points are preformed sleeves via which service pipes may enter the structure. These are bonded to the protective membrane.


  • Material: polypropylene.
  • Colour: black.
  • Cavibricks and caviweeps are available in a range of colours.
Type N Sitesealer Membrane Type N Sitesealer Membrane
£242.45 + VAT
Radon gas resistant membrane for use on oversites. General purpose sitesealer damp-proof membrane. Tanking and waterproofing applications. Introduction Solid...
Service Pipe Entry Seals Service Pipe Entry Seals
£16.45 + VAT
Service Pipe Entry Seals (Top Hats) To seal and make gas tight where a service pipe or service cable passes through the oversite membrane. Sizes...
Gas Reception Sump Gas Reception Sump
£64.88 + VAT
The radon sump is a moulded vessel with inhalation apertures that is located under a building. its purpose is to reduce Radon gas pressure by receiving...
Radon Barriers Radon Barriers
Preformed cavity barriers designed to minimise the entry of radon gas into the building. Introduction Cavity Trays Limited has developed a range...