When modeling a project using the CBECC Com engine, the CEC requires that every zone have a valid floor to ensure a stable simulation within EnergyPlus. This means you either need a slab-on-grade if this zone has a ground floor slab, an exterior raised floor if this zone is over open space or crawlspace, or an interior surface designated with a floor assembly. The total of these surfaces needs to match the Conditioned Floor Area of the zone (which is the sum of the Room Floor Areas).
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