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I think the idea here was to increase the portion of the joist sitting on the support, which would mean the joist depth over the support would increase

Thanks for the explanation. Interesting to see how the final figure can be altered by using smaller centres and /or wider joists.

I like this as a back up thanks, although it would disturb the downstairs ceiling I think

Useful thank you. Would you mind sharing how you get to 0.61N/mm2? The clear span will be 4.65m if that impacts it

I'm looking at doing a loft conversion. The floor joists will need to cover a 4m odd span from the spine wall to the wallplate. Unfortunately a pretty severe chamfer will be needed to fit the joists onto the wallplate. I gather the concern is shear stress, but can't find what the limit would be...