Installing Floor In Aluminium Boat Should I Use 6mil Poly Over Sub-floor Before Installing Hardwood Floor In A 3 Season Cottage?

Should I use 6mil poly over sub-floor before installing hardwood floor in a 3 season cottage? - installing floor in aluminium boat

3 season, I built a heated hut on stilts, the poly on the subfloor prior to installing the floorboards? I Conference of the Parties to the ground to prevent the ingress of moisture in the house, but is not yet complete - the proof.