Metal siding. Beware of robotic termites.
The item id for Siding Metal in unturned is 1093. 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: Freeform
Size_X: 1
Size_Y: 1
Size_Z: 0.35
Health: 150
Range: 8
Radius: 0.125
Offset: 0.375
Explosion: 36
Blueprints: 1
Blueprint_0_Type: Barricade
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 67
Blueprint_0_Supply_0_Amount: 2
Blueprint_0_Build: 27
PlacementAudioClip: Sounds/MetalPlacement.mp3
Has_Clip_Prefab: false