WSP, mcCallumSather and ArcelorMittal unveiled the results of a theoretical case study at The Buildings Show earlier this month, which showed the costs and sustainability of using steel, concrete or timber are similar for a typical 12-storey, 287,000-sf, L-shaped residential condominium tower in the Greater Toronto Area (GTA). A conference session titled ‘The Triple Bottom Line of Structural Materials: Cost, Speed and Life Cycle Assessment’ featured Brant Oldershaw, P.Eng., WSP’s director of structural, mechanical and electrical engineering for Southwestern Ontario; Willems Ransom, principal and architect for mcCallumSather; Matthew Winters, P.Eng., Steligence project manager for ArcelorMittal; and Mike Cortese, principal sustainability projects manager for ArcelorMittal. As they explained, WSP and mcCallumSather joined steel producer ArcelorMittal’s Steligence program to model and compare the performance of different building materials for the same theoretical project. Consulting engineering firms RJC and MTE also contributed to the project’s structural details.