Maple planks ideal for fortifying windows.
The item id for Fortification Maple in unturned is 29. 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: 300
Range: 4
Radius: 0.5
Offset: 0.4
Explosion: 19
Blueprints: 1
Blueprint_0_Type: Barricade
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 61
Blueprint_0_Supply_0_Amount: 7
Blueprint_0_Build: 27
PlacementAudioClip: Sounds/WoodenPlacement.mp3
Has_Clip_Prefab: false