Pine floor. Beware of termites.
The item id for Floor Pine in unturned is 52. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Structure
Construct: Floor
Size_X: 2
Size_Y: 2
Size_Z: 0.45
Health: 550
Range: 8
Explosion: 29
Blueprints: 1
Blueprint_0_Type: Structure
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 41
Blueprint_0_Supply_0_Amount: 3
Blueprint_0_Build: 27
PlacementAudioClip: Sounds/WoodenPlacement.mp3
Has_Clip_Prefab: false