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EXTERNAL ENVELOPE
AIM wall cavity barrier under zero compression A
IM – Acoustic & Insulation Manufacturing has demonstrated that its Wall Cavity Barrier (Red Edition) provides effective fi re performance without compression in masonry construction. The new zero compression solution means AIM’s Wall Cavity Barrier (Red Edition) can be installed easily with green brickwork, or other forms of masonry cladding, and avoids the problem of “brick push off” which can be associated with barriers installed under compression. Acting as a fi re and smoke barrier for masonry cavity walls, AIM’s Wall Cavity Barrier (Red Edition) is used to provide a fully closed cavity fi re barrier along compartmentation lines in the external cavity wall in a wide variety of construction types, including masonry and SFS. The different barrier thicknesses of 75 mm, 100 mm and 125 mm provide 30, 60 and 120-minute fi re ratings to BS EN 1366-4.
Applicable to masonry construction only, zero compression installation has been tested horizontally and vertically for use within voids up to 400 mm. The barrier
is installed and then the bricks built up against its edge. Once the mortar has set, AIM Acrylic Intumescent Mastic should
be applied between the barrier and both substrates. A DPC separating layer can be included if required. “Tests have demonstrated that the AIM
Wall Cavity Barrier is effective without compression in masonry voids, a signifi cant product enhancement that offers far greater fl exibility during construction,” explains Ian Exall, AIM’s commercial director. The high-density foil faced stone wool barrier also reduces airborne transmission of sound by a minimum of 21dB RW. AIM will sell slab versions of the Wall Cavity Barrier (Red Edition) for zero compression applications – not cut barrier. This is so that the installer has total fl exibility in sizing of the barrier to exactly suit the cavity void size as required. Installation details, with a step by step
guide, can be found in AIM’s Wall Cavity Barrier (Red edition) Technical Guide, which can be downloaded at
aimlimited.co.uk/ solutions/wall-cavity-barrier.
01293 582400
www.aimlimited.co.uk
WWW.ARCHITECTSDATAFILE.CO.UK
ADF OCTOBER 2025
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