SIDERISE CVB Acoustic Void Barriers (formerly Lamaphon CVB)

SIDERISE CVB Acoustic Void Barriers (formerly Lamaphon CVB)

Siderise Group

SIDERISE CVB acoustic barriers are used in suspended ceiling and raised access floor voids to reduce sound transmission between rooms, designed for freestanding, acoustic performance up to 31dB Rw.

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SIDERISE acoustic void barriers are primarily intended to reduce sound transmission via hidden voids offering potential 'cross-talk' paths to adjoining areas. Typical examples include suspended ceiling or raised access floor voids at partition lines and the cavity formed at floor slab abutments to curtain walls.

As standard, the product incorporates opposing interlocking rebate joints in one direction. This feature helps maintain acoustic integrity at joints within the installed barrier. SIDERISE acoustic void barrier - facades is available in a number of grades and thicknesses offering a wide range of sound reduction values. The product is also available with a choice of optional high mass central membranes to achieve substantially higher SRI values. Some acoustic void barriers - facades have certified fire resistance permitting their dual use as ceiling or floor void fire barriers. The product is extremely simple to fix and can be easily cut to accommodate service penetrations.

The rockfibre insulation core is available in two different structural forms:

  • SFO (conventional, i.e. direction of the internal fibres predominantly aligns with that of the barrier itself).
  • HSL (special ‘lamella’ construction, i.e. the internal fibres have a perpendicular orientation and additionally are held in a pre-compressed state).

The SFO form is also optionally available with the inclusion of a central limp heavy membrane. Two surface weights of the polymeric membrane are available: P5 (5 kg/m²) or P10 (10 kg/m²).

General information


Aluminium foil


Silver (matt black and other coloured facing options available)


High Performance Acoustic Barrier


1200 x 1200; 1200 x 1000 or 1200 x 900 (according to grade)

Uniclass 2015

Pr_25_80_80_96 Wired mineral wool batt flexible cavity barriersPrimary


K40/287 Cavity barriers

K41/340 Cavity barriers

P10/432 Cavity barriers

P12/360 Mineral wool rigid batts

P12/40 Mineral wool rigid batts

Specification data - Wired mineral wool batt flexible cavity barriers

Product Reference


HSL, 90 mm thick, 7.1 kg/m², 23 Rw (dB).


HSL, 120 mm thick, 9.4 kg/m², 25 Rw (dB).


SFO, 100 mm thick, 10 kg/m², 19 Rw (dB).


SFO, 100 mm thick, 14 kg/m², 21 Rw (dB).


SFO + P5, 103 mm thick, 13 kg/m², 28 Rw (dB). Assessed value.


SFO + P10, 105 mm thick, 18 kg/m², 31 Rw (dB). Assessed value.

CVB/80/100R/P10 + CB10P

Twin barrier, 250 mm thick (overall), 29 kg/m², 49 Rw (dB).

Standard product features


High-density resin bonded rock fibre insulation core with exposed faces finished in a Class ‘O’ reinforced aluminium foil.


1200 x 1200 mm, 1200 x 1000 mm or 1200 x 900 mm according to grade, contact manufacturer for more information.

Fire performance (to BS 746-7):

Class 1.

Digital objects
Platform Compatible Version Certified to

Revit 2016





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