Which item is included in the reuse calculation for MRc1: Building and Materials Reuse?

LEED v5 MRc1: Building and Materials Reuse expressly includes existing building structure such as floor decking and roof decking, along with applicable enclosure elements, in the Building Reuse calculation. Consequently, floor decking is directly eligible. Hazardous building portions must be excluded from calculations, so asbestos-containing insulation cannot be counted as qualifying reused material. Earlier and current LEED guidance also distinguishes structural roof decking from nonstructural roofing materials such as roofing membranes; the latter do not qualify as structural reuse. Window assemblies and exterior glazing are likewise excluded from the applicable enclosure calculation methodology. The current LEED v5 Reference Guide explicitly identifies floor decking as a qualifying structural component and confirms that structurally unsound or hazardous portions must be excluded. Therefore, Option C is the correct answer.

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