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ROCKWOOL FirePro Intumescent Expansion Joint Seal

Intumescent Expansion Joint Seal is a compressible strip formed by shrink wrapping a graphite based intumescent polymer to both faces of a ROCKWOOL core. Intumescent Expansion Joint Seal is supplied in one metre lengths to suit the joint to be filled. The width of the product is dependent on the fire rating required (refer to data sheet or consult ROCKWOOL technical for details).

The seal is installed by simply compressing by hand and then pushing into the joint. Adjacent pieces of the product are tightly butted together. There is no need to use any adhesives or intumescent sealant in conjunction with the product.

In a fire, the graphite based intumescent material swells to form a hard char, which prevents the passage of fire and smoke through the joint.

Intumescent Expansion Joint is suitable for use in:

  • Blockwork cavities.
  • Curtain wall/Concrete slab interfaces.
  • Expansion joints.
  • Structural joints.


  • Simple to install.
  • Water resistant.
  • Maintenance free.
  • Available in small quantities.
  • Available from 48 hours of order.

General information

30 x 25 mm

15 mm thickness.

75 x 50 mm

15 mm thickness.

Uniclass 2015
Pr_35_90_87_54 Mineral fibre profile fillersPrimary

E40/545 Compressible sealing strip system

F30/616 Fire resisting movement joints without sealant

F30/670 Head of non-loadbearing walls

F30/78 Movement joints without sealant

Specification data - Mineral fibre profile fillers
Product Reference

ROCKWOOL Intumescent Expansion Joint Seal


30 x 25 mm

15 mm thickness.

75 x 50 mm

15 mm thickness.


1000 mm




Standard product features


Tested to BS476: Part 20, it provides up to 4 hours fire protection.

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