I would fill the void below the floor with polyurethane. It's very important to have a well insulated floor, more important even than well insulated walls.
We weren't allowed to, building regulations demanded a void and ventilation to the underside of the foundation to avoid radon buildup, even though we don't have any such risk here.
Radon buildup??? With simple concrete?? Never heard that one before. And here, all new houses have insulation underneath the concrete floor plate as well as on top. So I guess all new houses here are all Radon accidents waiting to happen?
Indeed, with the materials used I don't see how this could ever happen. These type of materials don't need ventilation. But hey building regulations, I know... don't get me started on those!
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