Protected Membrane Roof Assemblies (PMRAs) have benefitted from more than a half century of innovations and improvements. PMRAs developed in sophistication along with new building materials such as modified bituminous roofing membranes and single-ply roofing materials; and new applications such as vegetative roof assemblies (VRAs, or green roofs) and stormwater retention and detention assemblies (blue roofs).
Fusing function and form, commercial building roofs in the United States are opening up new vantage points for taking in iconic cities, landmarks, and waterways. As ordinances make protected membrane roof assemblies (PMRAs) more attractive to designers, they are also growing in size.
A high-performance roof system is durable, resilient, and allows a building to be occupied after a disaster event and continues performing during a loss of power. Designing beyond code minimums could help a roof stay intact with minimal damage during a storm.
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