AUST – HENDRY building surveyors advise that our clients ask us what protection is required to protect the occupants using an exit path from exposure to a fire within the building. The exit stair is required to be protected from any part of the external wall of the building which has a fire resistance rating of 60/60/60 or any openings in the external wall that are located less then 6.0m from the stair.
Clause D1.8(c)(ii) permits fire rated enclosure to be constructed to provide a shield so as to protect the occupants using the exit stair from exposure to a fire within the building. The construction of the shielding element must comply with the Clause D1.9(d) in relation to the fire rated construction and the protection of openings. Clause D1.8(c)(i) provides an alternative method of protection to the exit.
The following illustration from BCA Illustrated depicts an external stair lieu of an internal fire-isolated stair: