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Thanks to everyone who has replied and offered advice, it is much appreciated. In the end I went for doubled up 4x2 - 5 coach bolts in each - at 400mm centres. When I was putting on the edpm roof membrane it felt sturdy up there and whilst I was up there a mate below saw very little bounce in...

Thanks for that cdbe. Great to see this in practice. My father in law was saying just the same about 4x2s yesterday too so this has really helped cement that idea. Thanks for taking the time to post.

Hi there. First time post - nice to meet you! I'm planning a self build timber frame garden room with a flat roof that has an internal span of 3.3m. From the span tables I've seen, 6x2 on 400mm centres would be best - based on minimal loads as doing a cold roof and wont be up there often and...