The AIM Horizontal Fire Closer is a semi rigid Rockwool stone wool insulation laminated to a polythene DPC. It has been designed to provide up to two hours resistance to the spread of fire within a cavity that is adjacent separating floors within multi story buildings. It also significantly reduces flanking sound transmission within external wall cavities.
The AIM Horizontal Fire Closer has been designed
to provide up to two hours resistance to the spread
of fire within a cavity that is adjacent to separating
floors within multi story buildings. It also significantly
reduces flanking sound transmission within external
The Horizontal Fire Closer is supported with test evidence to show its performance in cavity walls constructed from a variety of different substrates including masonry, timber frame structures and SFS / through wall systems.
* For cavities in excess of 100mm, please use the AIM Wall Cavity Barrier complete with Polythene DPC
Example product installation schematic using materials by others
AIM Horizontal Fire Closer is supplied pre-cut in
1200mm lengths, 260mm wide and thicknesses
depending on the fire rating required. The product
supplied is as required to fill the void.
The pre-cut product is supplied with the required fixing clips
The product has been tested to BS EN 1366-4 to provide up to 120 minutes integrity and insulation.
Fire Rating (Integrity / Insulation)
- all horizontal and vertical use
Cavity width 100mm
|Application||Integrity / Insulation|
|Masonry to Masonry||120/120 minutes|
|Masonry to Softwood||60/30 minutes|
|Masonry to OSB||60/60 minutes|
|Masonry to CP Board / SFS||60/60 minutes|
AIM Horizontal Fire Closer may be used to reduce
the passage of flanking sound through external wall cavities.
It complies with Approved Document E to the Building Regulations and provides at least 23db Rw (minimum 140mm bearing). It also helps in meeting the requirements of Robust Details..
WF 432745 = Masonry
WF 399452 = Timber & SFS
WF 414885 = Timber & SFS
Z11012 – Acoustic Performance – Testing on mineral fibre insulation. To BS EN ISO 10140-2.
More drawings available in the Technical Guide which can be downloaded above.
The AIM Horizontal Fire Closer should be installed in
the external wall cavity at the level of the separating
floor. The closer is installed with the wide DPC overlap
uppermost, as indicated in the illustrations with the
DPC embedded into the inner blockwork in the
mortar layer above the closer, so as to form a cavity
tray. When used with a sheathing board, the DPC
should be dressed behind the breather membrane.
Horizontal Fire Closer are designed for use in cavities up to 100mm (for 100mm+ use WCB with DPC).
They have been tested vertically and horizontally to BS EN 1366-4.
They are installed under compression (minimum 5% compression required).
They should be installed with fixing clips
Non-standard sizes and DPC offsets are available
• PPE abrasion resistant gloves
• PPE impact resistant goggles
• RPE dust mask
• Tape measure
Products are supplied in cartons on wooden pallets
with edge protection and a shower proof hood.
Orders can be supplied without cartons on request.
Products should be stored away from the elements until ready for installation.
This product does not contain moving parts and,
if undisturbed in the cavity, requires no routine
inspections or maintenance.
It is recommended that the integrity of the barrier is rechecked if further works are carried out, which may involve disturbing the product.
AIM fire barriers are chemically inert, will not sustain vermin and do not encourage the growth of rot, fungi, moulds or bacteria. They are compatible with all normal building materials. Rockwool stone wool has been proven in service for over 60 years, in a wide range of climates and degrees of exposure. It will generally perform effectively for the lifetime of the building, plant or structure.
HEALTH & SAFETY
Insulation products supplied by AIM are considered
to be inert articles and as such are exempt from
requirements to provide a Safety Data Sheet.
A Product Safety and Handling Information Sheet is available upon request.
Global warming potential = zero For product recycling please contact: Rockwool T: 01656 868400 E: [email protected]
To order this product the following information will be
• Cavity depth in mm
• Fire Performance required
• Approximate quantity
• Delivery location
All AIM fire barriers are made to order. Products are typically supplied in seven to ten working days but lead times may vary depending on existing factory commitments.
There is no minimum order quantity or value although small orders may attract transport surcharges.
Technical Support is available from our experienced sales team on 01293 582 400 or [email protected]
We are a quality insulation convertor with over 30 years experience in the design, testing & manufacturing of high quality fire barriers for customers worldwide.
AIM are partners with NBS. Our products can be found on NBS Source and have been authored to NBS specification standards and have both CAWS and Uniclass 2015 classifications.
AIM are members of Centre for Window and Cladding Technology & ASFP.
AIM are working in partnership with Rockwool.