Technical Information

Firestem foam incorporates the very best quality open-cell fire resistant foam, bonded to own unique high performance intumescent material graphite.

Firestem intumescent expansion joint is designed for ease of installation and to be cost effective, the solution for stopping flexible gaps in fire rated building elements. Gaps from 8mm to 150mm and up to 4 hours integrity.



  • Water resistant
  • Suitable for all types of building movement joints
  • Vermin, rot proof and maintenance free
  • Easily fitted without specialist equipment
  • Strips come in lengths of 1 metre.
  • Suitable for gaps in walls, floors ranging between 8mm and 150mm wide.
  • Product is friction fitted.


Fire rated up to 4 hours tested to BS476 Part 20.

Firestem intumescent expansion joint is simple to install, flexible, and can be installed to wet surfaces.

Enquire about this product

Contact us