Reclaimed beech floor installation advice

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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!
 
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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.
 
Hi thanks and sorry, just seen this response. I had checked with Junckers and they said it was OK. For anyone interested they said I needed to strip off the plastic film on the underside.
 

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