Chipboard and insulation on concrete floor

Some advice please.
I have 100mm concrete that was laid on a plastic sheet on sand on hardcore.

I am now battening the floor with 25mm X 50mm battens on top of which I am laying 22mm P5 T&G Chipboard.

In between the battens I am laying 25mm insulation (sadly only polystyrene sheets as I have been waiting for ages for Kingdom or Celotex but it is not available.

I think I need another DPC to prevent any additional moisture coming from the concrete but I am not sure where it needs to go.

Do I put it under the battens or on top of the battens and insulation.

I was going to screw the battens to the concrete and screw the chipboard to the battens both of which will penetrate the DPC that I am about to lay?

Mmm think I have gone about this the wrong way.
I am not laying a floating floor hence the battens but I cannot glue the battens to the floor because it is dusty. If I seal it with some stabiliser I still need a DPC?
If I lay down a DPC on top of the slab then I cannot glue the battens down and screwing them in will penetrate the DPC.

There is still a DPC under the slab though?

Any ideas on the best method. I have been advised that the wood battens should not come into contact with the floor due to moisture transfer?

Found this which suggests I can screw through the battens / membrane?

http://www.lets-do-diy.com/Projects-and-advice/Floors/Laying-floorboards-onto-concrete.aspx

So a dpm must be continuous so no drilling through it. If you already laid a dpm under the slab it should be dry anyway. But you should have laid it on sand blinding to avoid puncturing it. You also need to lap the edges over your dpc.

I'd have put the membrane down first, then laid the insulation, and then the T&G. Polystyrene will be better than nothing, but try ebay for kingspan or equivalent.

John D v2.0 said:

But you should have laid it on sand blinding to avoid puncturing it

Click to expand...

Skavenger said:

I have 100mm concrete that was laid on a plastic sheet on sand on hardcore.

Click to expand...

I think he did.

If you can get Celotex, why not just lay it on the concrete, and glue the T&G together on top? No real need for battens.