Which FM standard addresses performance criteria for multi-ply BUR systems?

• A. FM 1-60
• B. FM 1-29
• C. FM 1-40
• D. FM 1-45

Answer: (C)

The key idea is that multi-ply BUR (built-up roofing) systems have their own performance criteria defined by a dedicated FM standard. Built-up roofs with several plies rely on the integrity of multiple layers and their seams under wind, weather, and aging, so they’re governed by a standard that specifies how these assemblies must perform and be tested. That standard is FM 1-40, which sets the performance requirements and testing methods for BUR systems, including how uplifts, seam integrity, and overall durability are evaluated to meet FM Global’s loss-prevention criteria. The other FM standards cover different roof types or components and don’t focus on the performance criteria for multi-ply BUR systems, so FM 1-40 is the appropriate reference for this topic.