Light gauge Steel Frame (LSF) wall systems are commonly used in residential and commercial construction due to their numerous benefits. With the increased use of LSF systems and a greater importance on fire safety needed, research on LSF systems has changed focus to complex LSF systems as a potential method to improve fire resistance. Complex systems are increasingly being used in situations of increased load-bearing or acoustic requirements, however, there is not sufficient data on the fire and structural performance of complex systems in the staggered configuration. This book thus analyses and reports the thermal and structural performance of complex staggered LSF wall systems, so as to improve understanding of heat transfer mechanisms within the system and assess the potential of the system for use in structural applications.