We are in the structural planning stages of our renovation/extension. I'm looking for ideas on beams to support the upstairs. the floor plan will be 8m x 7.5m clearspan and the walls will be ICF construction for both levels. Beams that spring to mind, but I'm not sure of the appropriateness of, are; Hebel, enginneered glulam, wood trusses, the chipboard webbed trusses, steel trusses, steel beams, or a poured concrete floor. Any others anyone can suggest? Pros and cons?