12mm or 19mm battens for 80x19 T&G floor on Slab On Ground?

Hi People,

I'm building a new home at the moment and I'm wanting to lay 80x19mm T&G HD beech flooring over black plastic and on battens fixed to slab on ground.

The slab is flat throughout, no steps. So there will be a diffenrece in step from the timber flooring in the living areas to the carpeted bedrooms.

I guess I can bevel the last board at the threashold to the carpeted doorways, but I'd like to reduce the bevel and step, so does anyone recommend if I used 80x12mm HD battens instead of 80x19mm battens?

1. Is this bad practise? with possibility of flooring lifting off the slab?
2. Or has anyone got a better suggestion to reducing that step? (I want to try and get away from ply sheeting the bedrooms to raise the level, cost issue..)

Any suggestions will be much appreciated!

Cheers.
DFA

G'day.
12mm Is no where near thick enough for holding HWD flooring secret nailed.
Stick with 19mm.

Or lay 15mm ply and glue and secret nail to that.

thanks glock!