What grade for floor joists

Joined
28 Jul 2008
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Location
Lancashire
Country
United Kingdom
Hi anyone,
I am converting my attic into an 'attic room'. The floor joists will span 3.470mtrs without support, other than being joined with joist hangers at either end.

Can I use C16 T1 graded 200 x 47mm carcassing with nogins in the center or will I need an higher grade timber.
 
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