NCC 2019 Volume Three Amendment 1
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2.5 Design scenario (HS)
A fully developed fire in a building exposes the external walls of a neighbouring building or fire compartment and a fully developed fire in the neighbouring building exposing the opening in the external walls of the building.
Demonstrate that the risk of fire spread between buildings is not greater than buildings complying with the Deemed-to-Satisfy Provisions.
This design scenario describes the requirements for a building to prevent horizontal fire spread to and from an adjacent building or fire compartment.