Use 1/2-plan (storage to useful load), other according to the house's conditions.

If possible, it might be slightly oversized on the support beam, but that is preferable to the opposite, right? Additionally, the cost difference isn't significant for a slightly sturdier LT-beam compared to a thinner one.
 
Ok, thanks. Will be a 90*315*6000 which should be enough.
 
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