Home > Companies > Siderise Group > SIDERISE SC Cavity Barriers and Firestops for Suspended Ceilings (formerly Lamatherm SC)

SIDERISE SC systems have been developed to provide a simple and easy to install method of sealing the void formed above suspended ceilings. The standard range includes options of materials that are cost effectively matched to suit the specific performance criteria for all suspended ceiling void requirements. Being specifically designed for this application, the products represent a combination of fully qualified performance, practical installation and service benefits. They comprise a one piece, close dimensioned product having a pre-compressed internal mineral fibre core. The products have integral aluminium foil facings to provide a Class 'O' rating and excellent resistance to smoke.


Cavity barrier systems used to subdivide uninterrupted voids in accordance with Building Regulations.


Fire stop systems maintaining the continuity of fire resistance for installations aligned with fire rated partitions, maintaining compartmentation.


  • Economical and easy to install.
  • Provides a smoke and fire seal.
  • Provides up to 300 minutes fire integrity and insulation.
  • Quality assured to BS EN ISO 9001.
  • No requirement for additional sealants or adhesives.
  • No requirement for fixing sub-frame.
  • Suitable for use in voids up to 1175 mm high.
  • Supplied in full sheets or pre-cut in strips to suit specific void heights.
  • Tested utilizing the principles of BS 476-20.
  • Up to 27dB (Rw) sound performance.

Standard product features


1200 x1200 mm. Pre-cut products are available in 1 mm increments of width so as to provide a tight compressive fit within the void; contact manufacturer for more information.

NBS Specification

NBS Create logo
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

50 mm thickness, 17 dB (Rw).
75 mm thickness, 21 dB (Rw).
90 mm thickness, 22 dB (Rw).
120 mm thickness, 25 dB (Rw).
175 mm thickness, 27 dB (Rw).

Fixing brackets

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Manufacturer details

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