Hi
First, make sure your existing floorboards are sound: fixed to the joists (not wobbling), not rotten and nut cupped.
Install foam (2 - 3 or 4 - 5mm) underlayment first, DON'T use combi product with DPM included.
Install the new floor in a right angle across the direction of the old boards (if possible, in some smaller areas this isn't, then you must be aware that joins of the new boards don't overlap joins of the old boards = draft)
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