{
  "Default Decay Multiplier": 0.0,
  "Prevent Decay Within Cupboard Range": true,
  "Developer Debug": false,
  "Decay Config": {
    "Building Blocks": {
      "Twigs": 1.0,
      "Wood": 0.0,
      "Stone": 0.0,
      "Metal": 0.0,
      "TopTier": 0.0
    },​

I had tweaked these settings to add some decay, then set the prevent decay in TC range to true and all the grades were decaying? I thought the mod would override using the TC range setting then anything outside could be controled with the twigs, wood ,stone, and topteir settings? Maybe i was wrong?

This mod would be perfect if all that worked!

Seeing a Bgrade is broken too I wonder if the hook is the same for the building blocks? Hence we are getting decay on building blocks like wood, stone, metal and top?

{
  "Default Decay Multiplier": 0.0,
  "Prevent Decay Within Cupboard Range": false,
  "Developer Debug": false,
  "Decay Config": {
    "Building Blocks": {
      "Twigs": 70.0,
      "Wood": 50.0,
      "Stone": 20.0,
      "Metal": 0.0,
      "TopTier": 0.0
    },
    "Deployables": {
      "barricade.concrete": 0.0,
      "barricade.metal": 0.0,
      "barricade.sandbags": 0.0,
      "barricade.stone": 0.0,
      "barricade.wood": 0.0,
      "barricade.woodwire": 0.0,
      "BBQ.Deployed": 0.0,
      "beartrap": 0.0,
      "box.wooden.large": 0.0,
      "campfire": 5.0,
      "fridge.deployed": 0.0,
      "furnace": 0.0,
      "furnace.large": 0.0,
      "gates.external.high.wood": 0.0,
      "jackolantern.angry": 90.0,
      "jackolantern.happy": 90.0,
      "landmine": 0.0,
      "lantern.deployed": 0.0,
      "locker.deployed": 0.0,
      "reactivetarget_deployed": 0.0,
      "refinery_small_deployed": 0.0,
      "repairbench_deployed": 0.0,
      "researchtable_deployed": 0.0,
      "skull_fire_pit": 0.0,
      "sleepingbag_leather_deployed": 0.0,
      "spikes.floor": 0.0,
      "survivalfishtrap.deployed": 0.0,
      "tunalight.deployed": 0.0,
      "wall.external.high.stone": 0.0,
      "wall.external.high.wood": 0.0,
      "water_catcher_large": 0.0,
      "water_catcher_small": 0.0,
      "WaterBarrel": 0.0,
      "woodbox_deployed": 0.0,
      "wall.window.glass.reinforced": 0.0,
      "Rowboat": 0.0,
      "RHIB": 0.0,
      "HotAirBalloon": 0.0,
      "minicopter.entity": 0.0,
      "door.hinged.metal": 0.0,
      "floor.ladder.hatch": 0.0,
      "door.hinged.toptier": 0.0,
      "SAM_Static": 0.0,
      "floor.grill": 0.0,
      "wall.frame.cell": 0.0,
      "shutter.wood.a": 0.0,
      "wall.window.bars.metal": 0.0,
      "door.double.hinged.metal": 0.0
    }
  }
}​

I use these settings and dont have any problems with High external walls decaying outside my base or anything that is metal or hq decaying on the map,

Ah okay! I would still like to be able to have upkeep off and decay in protection TC range set to true. 

When i tweaked:

      "Prevent Decay Within Cupboard Range": true,
      "Twigs": 70.0,
      "Wood": 50.0,
      "Stone": 20.0,
      "Metal": 0.0,
      "TopTier": 0.0

I was still getting decay in the TC range :S even though it was meant to be protected... Ill have another play tonight. I am sure its going to be server settings vs this mods settings and which takes control of what and when. Thanks for the config though I will be looking at the same kind of settings only with no upkeep costs.