Reclaimed beech floor installation advice

[HighlandGal]

Hello, long time lurker and searcher wanting to check proposed process for laying a new floor.

I have a timber suspended floor which now has good underfloor ventilation with IndiTherm insulation. I am about to lay a 22mm chipboard floor now it’s acclimatised for the past half week. I have D4 glue which I will apply to the T&G and along the joists.
My first question is should I also fix the chipboard to the joists with chipboard screws at intervals?

I’m then going to glue the planks (junckers beech from a sports hall) probably using Osmo flexible glue after they have had a week to further acclimatise in the actual room. I’ve noticed that some of them have a plastic backing.
So my next question is do I strip this off? I plan on a 15mm expansion gap all round for both chipboard and beech (the room is approximately 4.5 at widest and 6.5 at longest).

The floor will then be left for a couple of weeks before sanding and hard waxing.

Can you knowledgeable folks think of anything I’m not doing right or missing? Much thanks from the sunny highlands of Scotland!

 

[crazydaze]

If your glueing the junkers down I’d imagine it will need to go down into 6mm Ply, chipboard doesn’t have the tensile strength for when the Junkers try’s to move.