SIDERISE CBX Flexible Acoustic Barriers for Suspended Ceilings (formerly Lamaphon CBX)

SIDERISE CBX Flexible Acoustic Barriers for Suspended Ceilings (formerly Lamaphon CBX)

Siderise Group

SIDERISE CBX flexible composite acoustic quilt used for free-hanging in ceiling voids above partition lines to significantly reduce sound transmission between rooms, acoustic performance 29-33dB Rw.

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Flexible composite quilts designed for free-hanging in ceiling voids above partition lines. They have been specifically developed to provide a simple solution to the common problem of improving `room-to-room' sound separation via a common ceiling void. All grades offer exceptional sound reduction properties in comparison to common ad-hoc solutions using standard flexible/ resilient materials.

SIDERISE CBX acoustic ceiling void barriers are multi-layered composite materials. The central layer is a thin flexible heavy septum membrane. Two types of membrane are available; lead foil or a polymeric heavy salt loaded barrier. Both types incorporate to one side a laminated glass fabric 'anti-creep' layer. This is designed to prevent possible long-term elongation of the product in its normal free hanging condition. Additionally, this layer provides additional reinforcement to through penetrations at fixing points. Both types of central membranes provide matching acoustic performance for each of the two standard surface weight options. The primary difference between the types is their mechanical characteristics when bent or deformed. The lead foil membrane has a tendency to memorize deformation. Each side of the membrane has a soft high-tensile glass fibre insulation layer, faced on the exposed surface with a reinforced aluminium foil. It is extremely quick and easy to install and is suitable for both new build and refurbishment projects.

General information


Aluminium foil




Improves ''room to room'' acoustic performance, flexible allowing easy install, Suitable for new build and refurbishment projects


Foil Faced Glass Wool and Polymeric Barrier


2000 x 1200 mm

Uniclass 2015

Pr_25_80_80_14 Coated woven glass fibre cloth flexible cavity barriersPrimary


K40/287 Cavity barriers

P10/410 Flexible cavity barriers

Specification data - Coated woven glass fibre cloth flexible cavity barriers

Product Reference


Lead foil central membrane, 5 kg/m².


Polymeric barrier central membrane, 5 kg/m².


Lead foil central membrane, 10 kg/m².


Polymeric barrier central membrane, 10 kg/m².

Standard product features


Bright reinforced aluminium foil to both surfaces.

Thickness (nominal):

40 mm.


  • CB5 and CB10: 1800 x 1200 mm; special lengths are available, contact manufacturer for more information.
  • CB5P and CB10P: 2000 x 1200 mm.

Thermal conductivity:

0.035 W/m·K.

Sound reduction:

  • CB5 and CB5P: 29 dB (Rw).
  • CB10 and CB10P: 33 dB (Rw).

Digital objects
PlatformCompatibleVersionCertified to
IFC2X3 2 1.3
Revit 2016 3 2.0
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