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12 minutes ago, Nickfromwales said:

You don’t use the FB’s throughout!

steel across the garage door opening, one FB mid span and then timbers between. 
Looking at the pic, why not just use steel T section and then span from centre out?


A big, central steel (red), off the the existing (red) RSJ across the opening was my initial thought. Then new, deeper (black) beams was the plan. I know the concept but have no ideas how to calc the sizes.



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As per my PM, I think sistered 5x2 C24 glued and construction-screwed to the existing will be crazy strong. 
You could even add perpendicular timbers behind the uprights like strong backs. 

Edited by Nickfromwales

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