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Hi woody, when you say substantial beam, what would that look like? 152x89 or something heavier

I've found so much varying information and nothing for my specific scenario. I'm having a single storey rear extension with 3m bifolds out the back. Warm flat roof. 100mm block on each skin and 150mm cavity w/ full fill ins 4m (3.65 internal) out and 5.7m across (5m internal) - the ceiling...