This presentation encompasses an in-depth examination of the technical aspects of the spatial separation requirements in the Building Code including assumptions, simplifications and basis information. The presentation will provide details of:
1. Early history of fire limits and insurance rating exposures
2. The St. Lawrence burn tests
3. Conversion of St. Lawrence burn test results to regulations, including the spatial separation table development and underlying equations and assumptions
4. Details of the basis of more recent developments including concentrated openings, compartment-to-compartment exposure, 10-minute fire department arrival time

This presentation is intended to provide attendees with a detailed understanding of the technical basis and assumptions underlying the current spatial separation requirements to facilitate a better understanding of their application to design and review of alternative solutions.