Raised access floor fire barrier system supports safe service penetrations
Iain Hoey
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Raised access floor fire barrier designed for UK building services
AIM – Acoustic & Insulation Manufacturing has introduced a method for maintaining fire barrier integrity when services pass through raised access floors in UK buildings.
The company’s Raised Access Floor Barrier (RAFB) can now be paired with Rockwool FirePro Ablative Batts to support service penetrations without compromising fire performance.
According to AIM, the updated installation approach avoids the need for replacing the entire barrier with ablative material or seeking approval from a fire engineer.
The new solution is designed for installers, specifiers, fire consultants and raised access floor system holders.
The system is tested to BS EN 1366-4 and the principles of TR31 and provides up to 120 minutes of integrity and insulation.
Product design and installation process explained
AIM’s Raised Access Floor Barrier (RAFB) is used to prevent flame and smoke movement in underfloor cavities, create plenum chambers, and preserve the integrity of partitions.
To allow for service routes such as cable trays or pipework, AIM has developed a tested method combining the RAFB with two Rockwool FirePro Ablative Batts positioned either side of the barrier.
Services pass through both the AIM RAFB and the batts. Any remaining voids around the services are sealed with Rockwool FirePro Acoustic Sealant, along with pipe sleeves or pipe closers if required.
AIM confirmed that the addition of the Rockwool batts does not reduce the fire resistance rating of the original barrier.
This method enables service installation without disrupting the core fire-stopping function of the barrier.
Fire resistance certification and performance details
The RAFB system has been tested in accordance with BS EN 1366-4 and the principles of TR31.
The system has demonstrated up to 120 minutes of both fire integrity and insulation when used as specified.
According to AIM, the approach also reduces airborne sound transmission by up to 51 dB Rw when combined with an access floor system.
The barrier is manufactured from high-density Rockwool stone wool and faced with impervious foil on both sides.
It is supplied either cut to size or in full slabs for on-site cutting.
Retrofit options and sourcing information
AIM stated that its method supports phased installation, allowing services to be installed after the barrier is in place.
This retrofit capability may simplify scheduling and reduce disruption during staged fit-outs.
The Rockwool Ablative Batt can be purchased directly through AIM along with the RAFB or sourced separately through regular suppliers.
According to AIM, this offers flexibility for contractors procuring materials through established distribution channels.
Ian Exall, commercial director at AIM, said: “The many services required in modern offices are usually run through raised access floors, so must pass through dedicated fire barriers. AIM’s improved technical solution for accommodating services combines our RAFB with Rockwool Ablative Batts. It is tested and cost effective compared with building the whole fire barrier from an Ablative Batt.”
Raised access fire barriers used in UK construction
The Raised Access Floor Barrier is primarily used in UK commercial buildings where raised floors accommodate large volumes of mechanical and electrical services.
In these settings, the barrier maintains the continuity of fire compartmentation under floor voids.
The solution is part of a wider set of fire safety measures required for compliance with UK building regulations.
AIM is part of the Performance Technology Group and manufactures thermal, fire and acoustic insulation products from its UK facility.
More information, including the RAFB datasheet, is available at: https://www.aimlimited.co.uk/solutions/raised-access-floor-barrier/
Raised access floor fire barrier system supports safe service penetrations: Summary
AIM has introduced a method for allowing services to pass through raised access fire barriers.
The solution combines the AIM Raised Access Floor Barrier with Rockwool Ablative Batts.
The method is designed to maintain the fire integrity of the barrier.
It is tested to BS EN 1366-4 and the principles of TR31.
The system can provide up to 120 minutes of integrity and insulation.
AIM stated that the fire rating is not reduced by the addition of the batts.
The method avoids full replacement of the barrier when routing services.
It can be installed in retrofit applications.
The RAFB also reduces sound transmission by up to 51 dB Rw.
Materials are available directly from AIM or through standard suppliers.
The system is used in UK commercial buildings with raised floors.