Problems with bullet impact

// CONFIG START
class CfgPatches {
class hum_trafficSigns {
	units[] = { // list all addon objects
		"Land_trafficSign_40",
		"Land_trafficSign_80",
		"Land_trafficSing_militaryArea",
		"Land_trafficSign_moose",
		"Land_trafficSign_rocks",
		"Land_trafficSign_turnL",
		"Land_trafficSign_turnR",
		"Land_trafficSign_reflectorStick"
	};
	weapons[] = {};
	requiredVersion = 0.100000;
	requiredAddons[] = {};
};
};

class CfgVehicleClasses {
class hum_trafficSignsClass {
	displayName = "hum's Traffic Signs"; // addon name in editor
};
};

class CfgVehicles {
class HouseBase; //*extern*

class House : HouseBase { // dont ask why
	class DestructionEffects; //*extern*
};

class Ruins; //*extern*

class Land_trafficSignsBase : House {
	armor = 150; // cannot be destroyed by bullets
	animated = false; // not animated
	mapSize = 0.1;
	icon = "iconStaticObject";
	scope = 2; // 2 = public (can be seen from editor)
	           // 1 = private
	accuracy = 0.2; // accuracy -> recognize type
	placement = "vertical";

	transportAmmo = 0;
	transportRepair = 0;
	transportFuel = 0;

	destrType = "destructtree"; // will fall like a tree

	class DestructionEffects {
		class DestroyPhase1 {	// wtf is happening here
			simulation = "destroy";
			type = "DelayedDestruction";
			lifeTime = 2.5;
			position = "";
			intensity = 1;
			interval = 1;
		};
	};
};

// All objects are listed below
class Land_trafficSign_40 : Land_trafficSignsBase { // uses defaults from class trafficsignbase
	model = "\hum_trafficSign\hum_trafficSigns_40.p3d"; // model location
	vehicleClass = "hum_trafficSignsClass"; // belongs to addon..
	displayName = "Sign Speedlimit 40"; // object name
};

class Land_trafficSign_80 : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_80.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign Speedlimit 80";
};

class Land_trafficSign_militaryArea : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_militaryArea.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign Military Area";
};

class Land_trafficSign_moose : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_moose.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign Moose Warning";
};

class Land_trafficSign_rocks : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_rocks.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign Falling Rocks Warning";
};

class Land_trafficSign_turnL : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_turnL.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign S-turn Left";
};

class Land_trafficSign_turnR : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_turnR.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign S-turn Right";
};

class Land_trafficSign_reflectorStick : Land_trafficSignsBase {
	model = "\hum_trafficSign\hum_trafficSigns_reflectorStick.p3d";
	vehicleClass = "hum_trafficSignsClass";
	displayName = "Sign Reflection Stick";

	armor = 5; // can be shot down		
	destrType = "destructtree"; // will fall like a tree
	class DestructionEffects;
	};
};
};

// CONFIG END

rough = 0.1;
dust = 0.1;
bulletPenetrability = 20;
soundEnviron = "metal";
isWater = false;
thickness = 10;
density = 2750;
friction = 0.9;
restitution = 0;
impact = "Impact_Metal";
soundHit = "metal";