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My structural steel woes continue: I have a 'small' area 4.3m x 2.8m including supporting wall (depth to 100m) that is single storey where I want to put a glass canopy as part of the otherwise flat roof. The glass canopy is 2.5m x 1.5m approx. My plans show two 'huge' 152 steel beams...

Hi everybody My part-one, part-two storey extension has commenced, and I have hit my first stumbling block. I managed to get walls of 260 mm thickness, however, I cannot get my structural engineer to design columns that will fit in this thickness (100 mm internal blocks, 25mm insulation...