Expansion joints

Decoupling in expansion joints is a technique used as a sealant in civil engineering to accommodate space from operation in the joint. It is mainly used for infrastructure works such as bridges, tunnels and viaducts. Our SIREX® PE Expansion Foam C33 is used for joint fillings at expansion joints in bridge and road construction.

Impact sound attenuation

Our acoustic decoupling is often used by contractors and assembly firms. Indeed, in buildings, acoustic decoupling panels are often used to reduce noise from outside. This can be achieved by installing sound insulation in the walls, floors and ceilings. Our SIREX® Casco is very suitable for semi-detached houses. It is used for acoustic and thermal decoupling of precast concrete and sand-lime brick elements in house, flat and utility construction. This insulation is inserted between the hollow-core slabs and decouples the concrete. This prevents the concrete from being poured against each other and stops noise nuisance from adjacent neighbours.



  • Easy to process and install
  • Good mechanical properties
  • Good resistance to most chemicals
  • Environmentally friendly
  • Permanently elastic
  • Expansion foam does not absorb moisture

Our decoupling products


SIREX PE Expansion foam C33

SIREX EVA Expansion foam N30

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