Creaky New Merbau Deck!

Well the missus finally convinced me to start the merbau deck... stage-1 was a 1410(W)x1350(L) deck leading up to the house.

Posts 90x90 TP
Bearer 190x45 TP
Joist 90x45 TP (connected with joist brackets at approx 300mm)
Merbau 90x19 (approx 3mm gap)
Stainless steel screws on the joists, each pre-drilled.

Looks great (will post pics later tonight), but it creaks! Is this normal, or did i miss something. There is minimal 'play' in the merbau decking, but it feels like the joists.. I'm not sure what's causing it or how to fix.

Not sure if i missed any other details -
Cheers
PhantomMan...


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