Decay

Player made structures start to suffer from decay after a grace period, damaging them regularly until they're destroyed.

Grace Period

The Grace Period starts when the structure is built. Its duration depends on the structure type (see the table at the bottom). It is reset if the structure is upgraded, however Small Modifications and Infrastructure Modifications for Trenches and Bunkers do not count. Repairing a decayed structure partially resets it, proportionally to how much health percentage was repaired.

Affected Structures

Decay affects all player placed structures, including deployed tripods and shippables (containers, concrete mixers, emplacements, etc...). The exceptions are standalone Anti-Tank Mines, AP Mines, and Sea Mines which always last 48 hours and Signposts which last 50 hours by default but changes depending on the numbers of votes they receive. The A0E-9 Rocket Platform and its Rocket also do not decay.

Unfinished structure Build Sites suffer from decay but it cannot be prevented. Unfinished vehicle Build Sites (Motorboat, Construction Vehicle) are unaffected by decay.

World structures (e.g. Garrisoned Houses, Town Bases, World Resource Mines, etc...) are not affected by decay. The only exception are Border Bases due to the Frontier Border mechanic.

Decay does not affect vehicles, but most will despawn after 3 days of inactivity to help server performance.

Decay Prevention

A Base can prevent the decay of structures within its AI range by consuming Maintenance Supplies placed in its stockpile.

A Maintenance Tunnel can also prevent decay by consuming Maintenance Supplies. In its menu, the player can adjust the supply range (0-100m) and select the types of structures to maintain (using the same categories as the Build menu plus one for Shippables).

When placing a structure blueprint, the game will show you whether it is in range of a supply source. You can use a Hammer in Upgrade Mode (F) on a structure to see whether its decay is prevented by a Base or Tunnel and to see the distance and direction towards it.

You can check the maintenance status of a base or tunnel by putting your cursor on the tiny maintenance supplies icon in their menu.

Structures whose decay is actively prevented also get slowly repaired (1% health per hour) regardless of the damage source.

Supply Consumption

The Maintenance Supplies are consumed at a rate of 1 per decaying structure per hour. The modifications on Trenches and Bunkers do not count as separate structures.

A handful of structures additionally have increased consumption:

Foundations consume x2.
Underground Pipelines consume x4.
Provisional Roads consume x3.

Rapid Decay Zone

No-Build Zone represented in red and Rapid Decay Zone in green.

Structures built within 150m of a region border suffer from rapid decay. Their grace period and decay duration are 10 times shorter, most structures only last a few hours. Trying to place a structure blueprint in that area will show you a warning. Rapid decay cannot be prevented.

Exceptions:

Structures built within 50m of a Resource Field, Resource Mine, or World Base are not affected
Structures built within 40m of a friendly Border Base on the enemy's side of the border
Small Gauge Railway Tracks and Railway Tracks are not affected
Shippable structures placed in the Rapid Decay Zone only have the shortened grace period, their decay duration remains unchanged.

Decay Duration

The time it takes for decay to fully destroy a structure (or structure husk) depends on its type, see the table below. A decay duration of 0 means the structure instantly dies the moment the grace period ends.

Structure	Grace Period (hrs)	Decay Duration (hrs)	Grace in Rapid Decay (hrs)	Duration in Rapid Decay (hrs)
50-500 “Thunderbolt” Cannon	48	24	4.8	24
A0E-9 Rocket Body	24	24	2.4	24
A0E-9 Rocket Booster	24	24	2.4	24
A0E-9 Rocket Platform	husk: 36	husk: 23	husk: 3.6	husk: 2
A0E-9 Rocket Warhead	24	24	2.4	24
Abisme AT-99 Minefield	24	16	2.4	1
Ammunition Factory	36 husk: 36	23 husk: 23	3.6 husk: 3.6	2 husk: 2
Anti-Tank Pillbox	48	32	4.8	3
AT Gun Garrison (Tier 2)	29.98 husk: 0.253	29 husk: 4	3 husk: 0.03	2 husk: 0
AT Gun Garrison (Tier 3)	75.25 husk: 75.01	44 husk: 46	7.53 husk: 7.5	4 husk: 4
Barbed Wire	25.001	16.667	2.5	16.667
Barbed Wire Fence	24	15	2.4	1
BMS Foreman Stacker	36	24	3.6	2
Border Base	60	60	6	6
Bunker (Tier 1)	12.501 husk: 1	6 husk: 0	1.25 husk: 0.1	0 husk: 0
Bunker (Tier 2)	29.29 husk: 0.253	30 husk: 4	2.93 husk: 0.03	3 husk: 0
Bunker (Tier 3)	75.001 husk: 75.001	45 husk: 46	7.5 husk: 7.5	4 husk: 4
Bunker Base (Tier 1)	87.5 husk: 0.667	60 husk: 0	8.75 husk: 0.07	6 husk: 0
Bunker Base (Tier 2)	100.01 husk: 0.33	60 husk: 1	10 husk: 0.03	6 husk: 0
Bunker Base (Tier 3)	116.7 husk: 0.667	69 husk: 1	11.67 husk: 0.07	6 husk: 0
Bunker Corner (Tier 1)	12.501 husk: 1	6 husk: 0	1.25 husk: 0.1	0 husk: 0
Bunker Corner (Tier 2)	29.29 husk: 0.253	30 husk: 4	2.93 husk: 0.03	3 husk: 0
Bunker Corner (Tier 3)	75.001 husk: 75.001	45 husk: 46	7.5 husk: 7.5	4 husk: 4
Bunker Hearth (Tier 1)	12.500001	6	1.25	0
Bunker Hearth (Tier 2)	29.291	30	2.93	3
Bunker Hearth (Tier 3)	75.001	45	7.5	4
Bunker Ramp (Tier 1)	12.501 husk: 1	6 husk: 0	1.25 husk: 0.1	0 husk: 0
Bunker Ramp (Tier 2)	29.29 husk: 0.253	30 husk: 4	2.93 husk: 0.03	3 husk: 0
Bunker Ramp (Tier 3)	75.001 husk: 75.001	45 husk: 46	7.5 husk: 7.5	4 husk: 4
Catwalk Bridge	36	24	3.6	2
Catwalk Platform	36	24	3.6	2
Catwalk Stairs	36	24	3.6	2
Coal Refinery	36 husk: 36	23 husk: 24	3.6 husk: 3.6	2 husk: 2
Concrete Foundation (1x1)	40	24	4	2
Concrete Foundation (1x2)	40	24	4	2
Concrete Foundation (2x2)	40	24	4	2
Concrete Foundation Corner (1x1)	40	24	4	2
Concrete Mixer	14.4	29	1.44	29
Crane Railway Track	36	24	3.6	2
Crate Transfer Station	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Crow's Foot Minefield	24	16	2.4	1
DAE 1b-2 “Serra”	48	24	4.8	24
DAE 1o-3 “Polybolos”	48	24	4.8	24
DAE 2a-1 “Ruptura”	48	24	4.8	24
DAE 3b-2 “Hades' Net”	48	24	4.8	24
Deployed Legion Vexillum	12	11	1.2	1
Deployed Listening Kit	12	12	1.2	1
Deployed Tripod	24	23	2.4	2
Deployed War Ensign	12	11	1.2	1
Deployed Wind Sock	12	11	1.2	1
Diesel Power Plant	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Dragon's Teeth	75	45	7.5	4
Dry Dock	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Encampment	36 husk: 0.667	24 husk: 0	3.6 husk: 0.07	2 husk: 0
Engine Room (Tier 2)	24.5	35	2.45	3
Engine Room (Tier 3)	75.001	68	7.5	6
Field Bridge	5	7	0.5	0
Field Hospital	41.67	19	4.17	1
Field Modification Center	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Field Range	33.33	24	3.33	2
Fire Pit	24	24	2.4	2
Foundation (1x1)	40	24	4	2
Foundation (1x2)	40	24	4	2
Foundation (2x2)	40	24	4	2
Foundation Corner (1x1)	40	24	4	2
Foxhole	8	3	0.8	0
Fuel Silo	36 husk: 36	24 husk: 23	3.6 husk: 3.6	2 husk: 2
Gate (Tier 1)	8.33	9	0.83	0
Gate (Tier 2)	41.67	22	4.17	2
Gate (Tier 3)	90.001	55	9	5
Howitzer Garrison	75.25 husk: 75.01	44 husk: 46	7.53 husk: 7.5	4 husk: 4
Huber Exalt 150mm	48	24	4.8	24
Huber Lariat 120mm	48	24	4.8	24
Huber Starbreaker 94.5mm	48	24	4.8	24
Infantry Kit Factory	36 husk: 36	23 husk: 24	3.6 husk: 3.6	2 husk: 2
Intelligence Center	120	60	12	5
Large Assembly Station	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Leary Shellbore 68mm	48	24	4.8	24
Leary Snare Trap 127	48	24	4.8	24
Liquid Container	12.01	24	1.2	24
Liquid Transfer Station	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Machine Gun Garrison (Tier 1)	12.65 husk: 1	31 husk: 0	1.27 husk: 0.1	3 husk: 0
Machine Gun Garrison (Tier 2)	29.74 husk: 0.253	32 husk: 4	2.97 husk: 0.03	3 husk: 0
Machine Gun Garrison (Tier 3)	75.01 husk: 75.01	46 husk: 45	7.5 husk: 7.5	4 husk: 4
Machine Gun Pillbox	36	24	3.6	2
Maintenance Tunnel	38	23	3.8	2
Material Pallet	24	12	2.4	12
Material Transfer Station	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Materials Factory	36 husk: 36	23 husk: 23	3.6 husk: 3.6	2 husk: 2
Medical Room (Tier 1)	12.500001	28	1.25	2
Medical Room (Tier 2)	29.291	30	2.93	3
Medical Room (Tier 3)	72	73	7.2	7
Metalworks Factory	36 husk: 36	23 husk: 23	3.6 husk: 3.6	2 husk: 2
Naval Hull Segments	24	24	2.4	24
Naval Shell Plating	24	24	2.4	24
Naval Turbine Components	24	24	2.4	24
Navy Pier	5	7	0.5	0
Observation Bunker (Tier 2)	30 husk: 0.253	29 husk: 4	3 husk: 0.03	2 husk: 0
Observation Bunker (Tier 3)	75 husk: 75.01	46 husk: 46	7.5 husk: 7.5	4 husk: 4
Oil Refinery	36 husk: 36	23 husk: 24	3.6 husk: 3.6	2 husk: 2
Oil Well	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Pipeline	24	34	2.4	3
Pipeline (Overhead)	24	34	2.4	3
Pipeline (Underground)	24	34	2.4	3
Pipeline Valve	24	34	2.4	3
Power Pole	36	24	3.6	2
Power Station	36 husk: 36	23 husk: 23	3.6 husk: 3.6	2 husk: 2
Power Switch	36	24	3.6	2
Prepared Minefield	1	0	0.1	0
Provisional Road	36	24	3.6	2
Railway Track	48	33	4.8	3
Railway Track (Biarc)	48	33	4.8	3
Railway Track (Foundation)	36	24	3.6	2
Resource Container	12.01	23	1.2	23
Resource Transfer Station	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Rifle Garrison (Tier 1)	12.5 husk: 1	29 husk: 0	1.25 husk: 0.1	2 husk: 0
Rifle Garrison (Tier 2)	29.91 husk: 0.253	30 husk: 4	2.99 husk: 0.03	3 husk: 0
Rifle Garrison (Tier 3)	75.001 husk: 75.01	44 husk: 45	7.5 husk: 7.5	4 husk: 4
Rifle Pillbox	24	15	2.4	1
Sandbag Cover Sandbag Wall	29.17	17	2.92	1
Sandbag Wall	66	39	6.6	3
Shipping Container	12.01	24	1.2	24
Small Assembly Station	36 husk: 36	23 husk: 23	3.6 husk: 3.6	2 husk: 2
Small Gauge Railway Track	48	33	4.8	3
Small Gauge Railway Track (Biarc)	48	33	4.8	3
Small Gauge Railway Track (Foundation)	36	24	3.6	2
Stationary Harvester (Coal)	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Stationary Harvester (Components)	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Stationary Harvester (Salvage)	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Stationary Harvester (Sulfur)	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Storage Box	33.34	19	3.33	1
Storage Room (Tier 2)	29.29	30	2.93	3
Storage Room (Tier 3)	72	74	7.2	7
Storm Cannon	119.001	68	11.9	6
Tank Trap	33.33	24	3.33	2
Trench (Tier 1)	12.501 husk: 1	6 husk: 0	1.25 husk: 0.1	0 husk: 0
Trench (Tier 2)	24.67 husk: 0.239	30 husk: 4	2.47 husk: 0.02	3 husk: 0
Trench (Tier 3)	43.75 husk: 43.75	29 husk: 29	4.38 husk: 4.38	2 husk: 2
Trench Connector (Tier 1)	12.501 husk: 1	6 husk: 0	1.25 husk: 0.1	0 husk: 0
Trench Connector (Tier 2)	24.67 husk: 0.239	30 husk: 4	2.47 husk: 0.02	3 husk: 0
Trench Connector (Tier 3)	43.75 husk: 43.75	29 husk: 29	4.38 husk: 4.38	2 husk: 2
Trench Emplacement (Tier 1)	12.501 husk: 1	6 husk: 0	1.25 husk: 0.1	0 husk: 0
Trench Emplacement (Tier 2)	24.67 husk: 0.239	30 husk: 4	2.47 husk: 0.02	3 husk: 0
Trench Emplacement (Tier 3)	43.75 husk: 43.75	29 husk: 29	4.38 husk: 4.38	2 husk: 2
Wall (Tier 1)	8.33	9	0.83	0
Wall (Tier 2)	41.67	22	4.17	2
Wall (Tier 3)	90.001	55	9	5
Watch Tower	32.08	21	3.21	2
Water Pump	36 husk: 36	24 husk: 24	3.6 husk: 3.6	2 husk: 2
Weather Station	120	60	12	5