Lifting parquet from a suspended timber floor

[nbk]

I would like to know if there are any tools or techniques for lifting parquet flooring installed in this manner. I need to lift all the boards (I have long thin parquet boards) to install underfloor heating.

As far as I can tell only the end boards (the ones near the walls) have been nailed down. All the rest are held together with the tongue in groove.

I have tried using a chisel but this seems to damage the parquet (on the edge).

Any advice would be greatly appreciated

[WoodYouLike]

If the floor has been installed long time ago all the T&G's will be tight locked together and there's definite chance T&G's will all damage when trying to lift.
Have you thought about skirting heating? (less trouble, upheaval etc).

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[nbk]

The property already had skirting heating installed when I bought it. And as far as I could tell it did not provide enough heat (both the lounges are quite large in size).

The boards don't seem to be locked together as the joints become visible when i pull them by hand. I was hoping that there would be some kind of tool which would grip the boards from the underside then I could hammer outwards