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In the case of buildings which contains courtyards, light-wells or wings, the unprotected areas on opposing or adjacent elevations could contribute to the transfer of fire between compartments. An important area in this respect is where a compartment wall meets at the junction formed by the internal angle of two elevations to a building. In this situation, the external walls should be protected on one or both elevations for a sufficient distance to limit the potential for horizontal fire spread between the compartments. In other situations, to limit fire spread between different compartments, it may be necessary to consider the space separation between opposing elevations.

In the case of a Residential (Institutional) building, where the means of escape (see Section B1) have been designed on the basis of progressive horizontal evacuation, special consideration is required for the junctions between compartment walls and the external elevations of the building (see 3.5.4

3.2.5.10 Courtyards, light-wells and opposite elevations of the same building

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