Twinned steel beams, or twin steel beams, bolted together. Steel sleeves can be placed over the bolts to give a precise gap between the two steel beams. This beam format is ideal where a wide beam is required, for example a cavity wall needs supporting. Bolting 2 small beams together in place can be lighter than one large beam. So install costs can be lower. This project we designed a twin steel beam to support an existing wall removal and a single beam to support a new extension flat roof and gable. The single beam had a metal plated welded to its top flange to make it wider to support the wide blockwork above. Full structural calculations were provided to Building Control. We also produced structural calculations for the timber rafters in this project at the instruction of Building Control. Please see next article.
BEAM 1 203x203x46 8mm plate
BEAM 2 2x203x133x30 bolted together