Does the EWI perform as a part of the fire rated walls of the building?

No. The EWI system is a non-structural external cladding system and does not form part of the building's fire-rated wall construction. The required fire resistance of the wall is typically provided by the internal wall build-up, such as the structural frame, sheathing board, and internal lining materials.

The EWI system has its own fire classification, which indicates its reaction to fire performance and is used by building designers and fire engineers when assessing the overall fire strategy of the building.