I have cc600 as I mentioned in the initial post, but still find it hard to imagine it will become stable??
this floor is probably self-supporting, but significantly more expensive... https://www.byggmax.se/golv/trägolv/massivt-trägolv/furugolv-25-27x158-p08927158
With cc600, I believe the cheaper floor will work sufficiently well for a storage space. The floor is tongue and grooved so it forms a sheet that distributes the load. It might be a bit shaky in the middle between the rafters, but it shouldn't collapse. You can lay down an 11mm OSB board and see how it feels. If it's good enough, the wooden floor, which is 4mm thicker, will definitely work.
The thicker floor above will certainly work.
Note: Remember to screw down the OSB before testing the flexibility.
The thicker floor above will certainly work.
Note: Remember to screw down the OSB before testing the flexibility.
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I'm going with regular chipboard flooring... it seems best 
but I have a little follow-up question regarding the insulation..
can I lay the flooring and then blow loose fill insulation from the sides between each truss or whatever you want to call it..
or is it advantageous to insulate first and then sheet? then you have nothing to walk on...
but I have a little follow-up question regarding the insulation..
can I lay the flooring and then blow loose fill insulation from the sides between each truss or whatever you want to call it..
or is it advantageous to insulate first and then sheet? then you have nothing to walk on...