Someone gave me a link to joists but I saved it on a browser that went
the way of all flesh recently. Searh for joists. The span will give you
the loading. I think 7 x 2's should do but you could bolt a pair
together to be certain they are faily cheap. If you can select your ow
choose straight timber with few or no knots. Certainly no large dead
knotts in the centre.

You aught to make a framework up to act as bracing. I wouldn't want to
advise you on that.


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