The BC FloorValue performance evaluation is enabled on the settings tab in BC Calc. It is only available for floor joists.
BC FloorValue shows the member's floor performance, but it is not a structural analysis. It includes the contribution of the sheathing span between members to overall feel.
Minimum: The feel of this floor system ranges from the lowest performing floor, which likely is also structurally inadequate, to one that is comparable to those designed to the code minimum L/360 live load deflection criteria. The closest comparable deflection range in terms of L-over ratings is L/0 to L/360.
Enhanced: The feel of this floor system ranges from just slightly better than a code minimum floor to one that exceeds a floor designed to the typically recommended L/480 live load deflection criteria. Similar to L/480 being the recommended live load deflection criteria for most I-joist floor systems, Enhanced is the recommended BC FloorValue rating for most I-joist floor systems. The closest comparable deflection range in terms of L-over ratings is L/361 to L/960.
Premium: The feel of this floor system ranges from just slightly better than Enhanced to one that exceeds a floor designed to Boise Cascade's Four Star L/960+ live load deflection criteria targeted at the more discriminating homeowner. The closest comparable deflection range in terms of L-over ratings is L/481 to L/999+.
It is important to note that the BC FloorValue rating will not always coincide with the L-over deflection results from the structural analysis or in literature span tables. Structural member design includes pattern loading and does not consider the flexibility of the supports whereas BC FloorValue does not consider pattern loading and takes support flexibility into account.