Steel joists for a 4 x 4.5 deck

Hi, I need some advice.

I have a 4 x 4.5 walled storage area that I want to put a deck over. Headroom is an issue so I want to keep the joists as small as possible.

I'm considering steel joists.

The joists will be supported on the walls, so overall span would be 4m. I think I'll also put in a central bearer and some posts, reducing the span to 2m.

The decking (cleverwood) calls for 450 max joist centres, but I could go smaller (400) if needed.

What size RHS do you think I should use?

Any help appreciated.


Thanks,

Dave


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