Home > Companies > Siderise Group > SIDERISE CW-AB Acoustic Barrier Overlay - Facades (formerly Lamatherm CW-AB)

A flexible acoustic composite for use as a mass overlay within curtain walling to form a high performance sound barrier. They represent a simple solution to the problem of improving 'floor-to-floor' acoustic performance when used in conjunction with SIDERISE CW-FS Perimeter Barriers and Firestops for Curtain Walling (formerly Lamatherm CW-FS fire and smoke stop for curtain walling).

SIDERISE Acoustic Barriers are extremely quick and easy to install and are suitable for improving sound performance within all curtain walling environments. Being flexible and thin, they are ideal for curtain wall application as unlike rigid boards or partitions, SIDERISE Acoustic Barrier Overlay is designed to accommodate façade deflection.


  • Accommodates façade movement.
  • Available in strip or sheet form for site cutting.
  • Deforms to contours.
  • Ideal for remedial treatment after installation of fire stops.
  • Quality assured to BS EN ISO 9001.
  • Reduces 'floor-to-floor' sound transmission.
  • Very flexible, easily cut and shaped on site.

Standard product features


Limp elastomeric heavy membrane applied to a flexible dense acoustic foam base layer. The upper surface is faced with a reinforced aluminium foil.

NBS Specification

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This product is associated with the following NBS Create clause:
45-45-70/427 Mineral wool fire stopping

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Siderise Group


+44 (0)1656 730833

Product reference

8 mm thick, 5.5 Kg/m² weight, 25 dB (Rw).
12 mm thick, 10.5 Kg/m² weight, 29 dB (Rw).

Manufacturer details

Forge Industrial Estate,
Mid Glamorgan, CF34 0AY
Tel +44 (0)1656 730833
Fax +44 (0)1656 812509
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