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 roof trusses, wherein the roof truss is identified by the specific members and member internal interfaces and the member properties; analyzing the roof trusses to determine if a roof truss has an external interface with another roof truss; isolating the roof trusses and the plurality of members; and analyzing each of the members of the roof trusses 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.