Pine planks ideal for fortifying windows.
The item id for Fortification Pine in unturned is 48. 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: Barricade
Build: Fortification
Size_X: 1
Size_Y: 2
Size_Z: 0.65
Health: 350
Range: 4
Radius: 0.5
Offset: 0.4
Explosion: 29
Blueprints: 1
Blueprint_0_Type: Barricade
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 63
Blueprint_0_Supply_0_Amount: 7
Blueprint_0_Build: 27
PlacementAudioClip: Sounds/WoodenPlacement.mp3
Has_Clip_Prefab: false