ISO/TR 24679-4:2015 provides a fire safety engineering application relative to fire resistance assessment of an open car park according to the methodology given in ISO/TS 24679. It describes the adopted process which followed the same step by step procedure as that given within ISO/TS 24679. The annexes of ISO/TR 24679-4:2015 presents the detailed numerical analysis results obtained for most severe fire scenarios on the basis of this specific fire safety engineering procedure for open car parks.