The Building Code of Australia in Part H1 Theatres, Stages and Public Halls requires the installation of fire curtains (proscenium walls) in every theatre and public hall (without a sprinkler system) between the stage, backstage area, accessible under-stage area and the audience. The building surveyor/ building certifier will always nominate fire curtains as an essential safety measure.
Building Code of Australia
BCA Part H1 nominates when fire curtains are to be installed, Specification H1.3 Construction of Theatres with Proscenium Walls, provides the details for construction of the theatre including the construction/ installation of fire curtains in all building approvals.
The main criteria for fire curtains must be either non-combustible or fitted so as to inhibit smoke penetration around its perimeter when fully lowered or fire curtains have specified early fire hazard indices protected by a deluge sprinkler system.
The following illustration depicts stages and back stages construction of fire curtains.