Screwing the ply floor down

[Rg_]

Got 9mm battons and 12mm ply floor. What size screws are best and any type?

I know its common sense but just want to be double sure.
Thanks

 

[Donk]

Erm .... doesn’t really matter as such. I normally do a couple of mm shy of the maximum In case you countersink them a bit too far! Just make sure you remember where the buttons are!

 

[Wills]

Sikaflex the batons to the metal floor then the appropriate length screws that are short of the mental floor.

 

[Rg_]

I havent screwed it down yet but noticed there is a bit of flex in some of the floor. I do weigh a fair bit and am 6ft so is that normal? I have batons on all the flat areas.

Will this eliminate it when the screws go down.

 

[Donk]

It’ll be fine once screwed down.