Brief Overview Our heavy-duty prefabricated portal frame building adopts solid welded H-section steel for columns and roof beams, NO roof truss. Specially engineered for factories with overhead cranes and heavy production equipment. The critical haunch corner joint (beam-column connection) is fully welded to resist large bending moment. We can design following UK BS, EN, GB codes. All steel parts are prefabricated, pre-drilled in factory, assembled by high-strength bolts on