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RADBAR flexible Hydrocarbon membrane is a tri-polymer membrane that provides an effective barrier against radon, VOCs, Methane, Carbon Dioxide and Hydrocarbon gases. It’s designed to protect properties whilst providing the flexibility to make installation easier.
This black Hydrocarbon Barrier Membrane can be used above or below the slab in concrete ground floors. It is manufactured from specific polymers to have excellent chemical resistance including volatile organic compounds (VOCs).
The membrane has undergone extensive testing to ensure its integrity under challenging conditions. This gives occupants peace of mind.
This hydrocarbon gas-resistant membrane is ideal for sites that have been formerly used as:
These previous uses mean that the ground can contain chemicals and volatile liquids.
Important note: This membrane is not suitable when subject to hydrostatic pressure.
The outstanding flexibility of this hydrocarbon barrier membrane makes it easy to install.
You should install this hydrocarbon membrane just before you lay the screed.
The flexible hydrocarbon membrane should only be installed on a blinded or smooth surface. Ensure that the surface has a smooth finish with no projections or voids - this applies to both concrete slabs and brick and blockwork.
Start by cleaning and then drying all surfaces to make sure they are free of grease, dust, mortar and any other debris.
Roll out the hydrocarbon membrane with the embossed surface uppermost, making sure it is aligned with the surface. When the membrane is laid below the concrete slab, it should be loose-laid to accommodate any small movements.
Where overlaps are required, ensure that the membranes overlap by a minimum of 150mm. Where they overlap, make sure they are dirt, dust and moisture-free. These joints can then be bonded together with Radbar Hydrocarbon Double-sided Jointing Tape and sealed with Radbar Hydrocarbon Single-sided Tape. Apply as much pressure as possible to the area being jointed.
If ground gases are present, then you need to consider ventilation during construction. During construction, a stand-by Radon sump can be installed with the pipework capped off close to the building outside.
A fan can be added to the pipe at a later date to activate the system if radon levels are found to be high. Suspended floors with a solid concrete base also allow the option to retrofit a vented system with a sump as either a passive (no fan) or active (with fan) system. This would be more disruptive to the homeowner than a pre-installed system at the construction stage. The Hydrocarbon membrane is compatible with vented systems.
The hydrocarbon resistant membrane should be covered by a screed or other protective layer as soon as possible after installation. The screed should be at least 55mm thick across the entire membrane. This will help protect it.
Important note: The membrane can be installed in all normal site conditions, provided that the air temperature is not below 5°C to prevent the risk of surface condensation. The membrane installation should be subject to third-party independent validation, in accordance with BS 8485:2015.
The continuity of the gas & hydrocarbon protection must extend over the footprint of the building, and the gas membrane must be sealed to a gas-resistant damp-proof course.
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