A computer program product comprising: accessing a model of a building, wherein the model is comprised of a plurality of assemblies, wherein the assemblies are comprised of a plurality of members; detecting the assemblies which are identified as floor joists, wherein the floor joist is identified by the specific members and member internal interfaces and the member properties; analyzing the floor joists to determine if a floor joist has an external interface with another floor joist; isolating the floor joists and the plurality of members; and analyzing each of the members of the floor joists which have external interfaces with other members, wherein the interface is analyzed to determine if the interface is conflicting, wherein a conflicting interface is one where the actual values of the members are inconsistent with a required value.