My plan is to dry wall my garage. I've checked and the walls have cavities, So as I understand it, damp should not be a problem, however I have noticed that the floor is below the damp course. My question is this: Can I just batten as normal, or do I need to take steps to prevent damp from coming through below the DPC?

Here's a picture of part of the inside wall to show what I mean:

Garage Floor below damp course

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