Introducing the new and improved SP Firestop OSCB!

To support specification and installation of fire stopping solutions in rainscreen systems, we have streamlined our ROCKWOOL® SP Firestop OSCB range to provide two clear options, both of which are proven to perform for up to 120 minutes when tested to ASFP TGD-19.

This means it’s easier than ever to design ambitious buildings featuring facades and rainscreen systems which are compliant to the latest fire safety requirements.


  • Tested to ASFP TGD-19, providing up to 120 minutes fire integrity and insulation
  • Available for cavity widths up to 600mm (OSCB 25) and 425mm (OSCB 44)
  • Easily identifiable white (OSCB 25) and red (OSCB 44) weatherproof polythene wraps
  • Weather resistant
  • Easy to store, handle and install

Learn more about SP Firestop OSCB and more ROCKWOOL non-combustible insulation solutions by visiting our Ventilated Façade Resource Hub: Visit the Resource Hub