Siderise CW-AB Acoustic Barrier

Flexible acoustic membrane to limit noise transmission at curtain wall firestops

 Acoustic barrier overlay for façade firestops  

CW-AB Acoustic Barrier can effectively reduce floor-to-floor sound transmission through perimeter barriers and fire stops within a curtain wall. Fitted as a mass barrier overlay above CW-FS Curtain Wall Firestop, the flexible membrane accommodates typical façade movement and can be easily shaped and cut to the contours of the building. Its thin design and simple installation process makes it a practical solution for both new build and remedial applications.  


The Siderise AB10 is a flexible acoustic membrane for use as a mass-barrier above Siderise CW-FS fire stops in curtain walls. Using this acoustic upgrade can offer a significant improvement to the acoustic performance of the firestop. Incorporating mass barriers such as the Siderise AB10 into slab-edge details is often crucial for controlling floor-to-floor sound transmission.
Siderise AB10 is quick and easily to install, and is suitable for use in all curtain walls. The product is thin and flexible, and is designed to accommodate façade movement, unlike traditional mass-barrier materials such as steel or plasterboard.


  • Reduces floor to floor sound transmission
  • Ideal for remedial treatment after installation of firestops
  • Accommodates façade movement
  • Deforms to contours
  • Quality assured to BS EN 9001
Product Description

Siderise AB10 comprises a high mass limp elastomeric membrane applied to a dense acoustic foam layer. The upper surface is faced with reinforced aluminium foil. The entire product is 12 mm thick.

Acoustic Considerations 

The fire stop between the floor slab and façade represents a point of significant potential weakness in vertical sound transmission between floors.

Our facades technical team can provide guidance around using this acoustic upgrade to meet the project's acoustic performance requirements.

Acoustic Performance

As the AB10 is sold as an acoustic upgrade for our CW-FS firestops, we have not tested its standalone performance, however for the purposes of assessment by project acoustic consultants, the Weighted Sound Reduction index (dB Rw) of the mass barrier layer alone is presented below in Table 1. 

See acoustic improvement below for the sound reduction index of this product in combination with the CW-FS firestop.

Additional acoustic performance increases can be achieved by combining the AB10 and CW-FS with the Siderise CVB/C10 cavity barrier. Contact our façades technical team at for performance guidance or 1/3rd octave test data.

Table 1 - Barrier grades & Weighted Sound reduction index

Product Type Thickness (mm) Product Surface Mass (kg/m2) Rw (dB)
AB10 (mass barrier layer only)

Acoustic improvement to the firestop zone

The Siderise AB10 has been developed for use with our Siderise CW range of perimeter barriers and fire stops for curtain walling.

Siderise fire stops already offer a good level of sound insulation performance (typically 22-25 dB Rw). This can be increased to 37 dB Rw by the addition of a Siderise AB10 overlay.
If further performance increases are required, our CVB/C10 cavity barrier can be used in addition to achieve up to 51 dB Rw. 

Technical Specification

Table 2 - Product Properties

Properties Value
Form Supplied 2000 x 1200 sheet or cut strip available
Colour Silver Face
Finish / Metal Aluminium foil facing to top side
Thickness (mm) 12
Central Mass Membrane Polymeric barrier
Surface Mass 10.5 kg/m2
Fire Performance B-s2-d0

Siderise is committed to the use of innovative materials and the development of products and technologies for a more sustainable future. We consider the environment in everything we do from the purchasing of our raw materials, the manufacturing processes we use to produce our products to their final end-use.

Additional Information Available

The following information is available upon request or via download from the website:

  • Safety Data Sheet
  • Standard Details
  • NBS Specification Clause
Technical Support

For technical advice or support please contact:

For Installation Training or Site Inspections please contact:


The information in this datasheet is believed to be accurate at the date of publication. Siderise has a policy of continuous product improvement and reserves the right to alter or amend the specifications of products without prior notice. Siderise does not accept responsibility for the consequences of using the products described outside of the recommendations within this datasheet. Expert advice should be sought where there is any doubt about the correct specification or installation of Siderise products.


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