Decking joists?

[CKbuilds]

Hello all, so I’m building a small 2.4x2.4 deck this weekend, I’m having a debate with my self about joist sizes. Wickes have got an offer on at the minute so 3x2 (70x45mm) is currently £4.50 per 2.4 length. Would this be strong enough for a low level deck? I’m planning on spacing joists at 30cm intervals. Would this be strong enough? I’ll be adding supports every 800mm and noggins 2-3x per joist. Let me know what you think, cheers!

 

[Dereekoo]

If each joist is supported at 0,800,1600,2400 and assuming C16 timber then the structure will take well over four times the standard loading allowance used in house flooring, noggins a waste of time.