Remedial works, refurbishments, renovations, installation of a new HVAC system, new plumbing, new wiring. Works involving a building’s walls have several obvious repairs that need to be completed after the works are finished, including sanding the walls, replastering, or at least patching the holes, and redecorating. But if the works have been to a compartment wall, penetrations that have not been resealed with firestopping materials leave the compartment line weakened and vulnerable to being breached by heat, smoke and flame sooner than might be expected, putting lives at unnecessary risk.