Gate and perimeter systems are critical safety components in commercial, institutional, and public environments, yet material selection is often driven by long-held assumptions rather than long-term performance. Steel has traditionally been viewed as the default choice for security, but corrosion, maintenance demands, and material degradation can compromise gate safety and reliability over time. This course examines gate safety through the lens of material performance, with a focused comparison of aluminum and steel gate and fence systems. Participants will review key safety standards, including ASTM F2200 and UL 325, and explore how aluminum’s corrosion resistance, durability, and reduced maintenance requirements help maintain safety, code compliance, and operational performance throughout the life of the system. The course also addresses sustainability and Buy America considerations, equipping design teams to make informed perimeter decisions that reduce risk and support long-term project value.