Product description



  • Third party certified
  • Ease of installation
  • Fully qualified fire performance
  • Fully qualified acoustic performance
  • Water resistant
  • Prevents the passage of cold smoke
  • Can accommodate structural service movement (during normal service life and fire)
  • Cost-effective
  • Durable


SIDERISE linear gap seals for facades are flexible, water resistant, intumescent linear gap seals that expand when exposed to heat. They provide a versatile means of sealing junctions between building elements against fire penetration.

The compressible foam core accommodates different joint widths to allow for structural movement whilst additionally meeting requirements for cold smoke seal, thermal and acoustic properties. Standard sizes are available to suit voids up to 100mm and to provide either a 2 hour or a 4 hour fire rating.

Note: This product was previously known as Lamatherm CW-GS linear gap seal for external facades.

Brochures, press releases, catalogues, technical data sheets