diff --git a/CommunityCoreLibrary.sln b/CommunityCoreLibrary.sln
index 3e5cb6e..da31265 100644
--- a/CommunityCoreLibrary.sln
+++ b/CommunityCoreLibrary.sln
@@ -215,7 +215,7 @@ Global
 		$30.inheritsScope = text/plain
 		$30.scope = text/plain
 		description = RimWorld Alpha 11 Community Core Library
-		version = 0.11.1
+		version = 0.11.3
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/CommunityCoreLibrary.userprefs b/CommunityCoreLibrary.userprefs
index f449d77..52b4d86 100644
--- a/CommunityCoreLibrary.userprefs
+++ b/CommunityCoreLibrary.userprefs
@@ -1,14 +1,13 @@
 <Properties StartupItem="CommunityCoreLibrary.csproj">
   <MonoDevelop.Ide.Workspace ActiveConfiguration="Release" />
-  <MonoDevelop.Ide.Workbench ActiveDocument="ThingComps\CompNeighbourlyGrower.cs">
+  <MonoDevelop.Ide.Workbench ActiveDocument="Properties\AssemblyInfo.cs">
     <Files>
-      <File FileName="ThingComps\CompColoredLight.cs" Line="310" Column="2" />
-      <File FileName="StaticClasses\ThingGroup.cs" Line="19" Column="38" />
-      <File FileName="GizmoCommands\CommandGroupOfTouchingThingsByLinker.cs" Line="22" Column="1" />
-      <File FileName="GizmoCommands\CommandGroupOfTouchingThingsByDef.cs" Line="26" Column="75" />
-      <File FileName="GizmoCommands\CommandGroupOfTouchingThingsByThingComp.cs" Line="14" Column="18" />
-      <File FileName="GizmoCommands\CommandGroupOfDefOrThingCompInRoom.cs" Line="48" Column="24" />
-      <File FileName="ThingComps\CompNeighbourlyGrower.cs" Line="23" Column="1" />
+      <File FileName="Defs\AdvancedResearchDef.cs" Line="11" Column="1" />
+      <File FileName="Alerts\Alert_PlaceWorker_Restriction.cs" Line="45" Column="42" />
+      <File FileName="ThingComps\RestrictedPlacement_Comp.cs" Line="55" Column="10" />
+      <File FileName="PlaceWorkers\PlaceWorker_OnlyOnThing.cs" Line="37" Column="1" />
+      <File FileName="PlaceWorkers\PlaceWorker_OnlyOnSurface.cs" Line="33" Column="68" />
+      <File FileName="Properties\AssemblyInfo.cs" Line="8" Column="38" />
     </Files>
   </MonoDevelop.Ide.Workbench>
   <MonoDevelop.Ide.DebuggingService.Breakpoints>
diff --git a/DLL_Project/Alerts/Alert_PlaceWorker_Restriction.cs b/DLL_Project/Alerts/Alert_PlaceWorker_Restriction.cs
new file mode 100644
index 0000000..dcee086
--- /dev/null
+++ b/DLL_Project/Alerts/Alert_PlaceWorker_Restriction.cs
@@ -0,0 +1,91 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using RimWorld;
+using UnityEngine;
+using Verse;
+using Verse.AI;
+
+namespace CommunityCoreLibrary
+{
+
+    public static class PlaceWorker_Restriction_Alert_Data
+    {
+        private static List< Thing >    destroyedThings;
+        public static List< Thing >     DestroyedThings
+        {
+            get{ return destroyedThings; }
+        }
+
+        private static int              cooldownTicks;
+
+        public static bool              AlertPlayer
+        {
+            get{ return ( destroyedThings.Count > 0 ); }
+        }
+
+        static PlaceWorker_Restriction_Alert_Data()
+        {
+            destroyedThings = new List<Thing>();
+            cooldownTicks = 0;
+        }
+
+        public static void Cooldown( int ticks = 1 )
+        {
+            cooldownTicks -= ticks;
+            if( ( cooldownTicks <= 0 )&&
+                ( destroyedThings.Count > 0 ) )
+                destroyedThings.Clear();
+        }
+
+        public static void Add( Thing thing )
+        {
+            destroyedThings.Add( thing );
+            cooldownTicks = 250;
+        }
+
+    }
+
+    public class Alert_PlaceWorker_Restriction : Alert_Critical
+    {
+        public override AlertReport Report
+        {
+            get
+            {
+                // Alert the player if something got destroyed
+                if( PlaceWorker_Restriction_Alert_Data.AlertPlayer == false )
+                    return false;
+                
+                // Return the first or default instance as the culprit
+                return AlertReport.CulpritIs( PlaceWorker_Restriction_Alert_Data.DestroyedThings.FirstOrDefault() );
+            }
+        }
+
+        public override string FullExplanation{
+            get{
+                var msg = new StringBuilder();
+                msg.AppendLine( "AlertPlaceWorkerRestrictionSupportRemovedDesc".Translate() );
+                foreach( var t in PlaceWorker_Restriction_Alert_Data.DestroyedThings )
+                    msg.AppendLine( "   " + t.def.defName );
+                return msg.ToString();
+            }
+        }
+        public override void AlertActiveUpdate()
+        {
+            if( PlaceWorker_Restriction_Alert_Data.AlertPlayer == true )
+            {
+                base.AlertActiveUpdate();
+                PlaceWorker_Restriction_Alert_Data.Cooldown();
+            }
+        }
+
+        public Alert_PlaceWorker_Restriction()
+        {
+            this.baseLabel = "AlertPlaceWorkerRestrictionSupportRemovedLabel".Translate();
+        }
+
+    }
+}
+
diff --git a/DLL_Project/CommunityCoreLibrary.csproj b/DLL_Project/CommunityCoreLibrary.csproj
index ae16157..77ddb9d 100644
--- a/DLL_Project/CommunityCoreLibrary.csproj
+++ b/DLL_Project/CommunityCoreLibrary.csproj
@@ -12,7 +12,7 @@
     <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
-    <ReleaseVersion>0.11.1</ReleaseVersion>
+    <ReleaseVersion>0.11.3</ReleaseVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -83,6 +83,7 @@
     <Compile Include="Commands\CommandGroupOfTouchingThingsByLinker.cs" />
     <Compile Include="Commands\CommandGroupOfTouchingThingsByThingComp.cs" />
     <Compile Include="Defs\AdvancedResearchDefExtensions.cs" />
+    <Compile Include="Alerts\Alert_PlaceWorker_Restriction.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
@@ -102,5 +103,6 @@
     <Folder Include="Defs\" />
     <Folder Include="StaticClasses\" />
     <Folder Include="Commands\" />
+    <Folder Include="Alerts\" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/DLL_Project/PlaceWorkers/PlaceWorker_OnlyOnSurface.cs b/DLL_Project/PlaceWorkers/PlaceWorker_OnlyOnSurface.cs
index d4b9201..10c3805 100644
--- a/DLL_Project/PlaceWorkers/PlaceWorker_OnlyOnSurface.cs
+++ b/DLL_Project/PlaceWorkers/PlaceWorker_OnlyOnSurface.cs
@@ -15,8 +15,7 @@ public class PlaceWorker_OnlyOnSurface : PlaceWorker
         public override AcceptanceReport AllowsPlacing( BuildableDef checkingDef, IntVec3 loc, Rot4 rot )
         {
             bool placementOk = false;
-            List<Thing> allThings = Find.ThingGrid.ThingsListAt( loc );
-            foreach( Thing curThing in allThings )
+            foreach( Thing curThing in loc.GetThingList() )
             {
                 if( curThing.def.surfaceType != SurfaceType.None )
                 {
diff --git a/DLL_Project/PlaceWorkers/PlaceWorker_WallAttachment.cs b/DLL_Project/PlaceWorkers/PlaceWorker_WallAttachment.cs
index a4dd40a..f8b74ea 100644
--- a/DLL_Project/PlaceWorkers/PlaceWorker_WallAttachment.cs
+++ b/DLL_Project/PlaceWorkers/PlaceWorker_WallAttachment.cs
@@ -19,7 +19,9 @@ public override AcceptanceReport AllowsPlacing( BuildableDef checkingDef, IntVec
             {
                 return false;
             }
-            if( c.GetEdifice() == null )
+            Building support = c.GetEdifice();
+            if( ( support == null )||
+                ( ( support.def.graphicData.linkFlags & ( LinkFlags.Rock | LinkFlags.Wall ) ) == 0 ) )
             {
                 return "MessagePlacementAgainstSupport".Translate();
             }
diff --git a/DLL_Project/Properties/AssemblyInfo.cs b/DLL_Project/Properties/AssemblyInfo.cs
index 6311346..d5761d6 100644
--- a/DLL_Project/Properties/AssemblyInfo.cs
+++ b/DLL_Project/Properties/AssemblyInfo.cs
@@ -30,5 +30,5 @@
 // Sie können alle Werte angeben oder die standardmäßigen Build- und Revisionsnummern 
 // übernehmen, indem Sie "*" eingeben:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.11.1.0")]
-[assembly: AssemblyFileVersion("0.11.1.0")]
+[assembly: AssemblyVersion("0.11.3.0")]
+[assembly: AssemblyFileVersion("0.11.3.0")]
diff --git a/DLL_Project/ThingComps/RestrictedPlacement_Comp.cs b/DLL_Project/ThingComps/RestrictedPlacement_Comp.cs
index 162ff1a..5dca593 100644
--- a/DLL_Project/ThingComps/RestrictedPlacement_Comp.cs
+++ b/DLL_Project/ThingComps/RestrictedPlacement_Comp.cs
@@ -13,6 +13,8 @@ namespace CommunityCoreLibrary
 
     public class RestrictedPlacement_Comp : ThingComp
     {
+        private static int          tickCount;
+
         private RestrictedPlacement_Properties Restrictions
         {
             get
@@ -20,6 +22,96 @@ private RestrictedPlacement_Properties Restrictions
                 return (RestrictedPlacement_Properties)props;
             }
         }
+
+        private List<PlaceWorker> PlaceWorkers
+        {
+            get
+            {
+                return parent.def.PlaceWorkers;
+            }
+        }
+
+        // Make sure things stagger their checks to prevent lag spikes
+        public override void PostExposeData() {
+            tickCount = parent.GetHashCode() % 250;
+        }
+        public override void PostSpawnSetup() {
+            tickCount = parent.GetHashCode() % 250;
+        }
+
+        // Tick for checks
+        public override void CompTick() {
+            DoChecks( 1 );
+        }
+        public override void CompTickRare() {
+            DoChecks( 250 );
+        }
+
+        // Oops!  We shouldn't be allowed!
+        public void DestroyParent()
+        {
+            PlaceWorker_Restriction_Alert_Data.Add( parent );
+            parent.Destroy( DestroyMode.Kill );
+        }
+
+        public void DoChecks( int ticks )
+        {   // This function maintains validation of the placement restrictions and
+            // destroys the parent thing if the requirements have changed for certain things
+            tickCount -= ticks;
+            if( tickCount >= 0 )
+                return;
+            tickCount = 250;
+
+            // Check for a roof
+            if( ( PlaceWorkers.FindIndex( p => p.GetType() == typeof( PlaceWorker_OnlyUnderRoof ) ) >= 0 )&&
+                ( Find.RoofGrid.Roofed( parent.Position ) == false ) ) {
+                DestroyParent();
+                return;
+            }
+
+            // Check wall support
+            if( PlaceWorkers.FindIndex( p => p.GetType() == typeof( PlaceWorker_WallAttachment ) ) >= 0 ) {
+                IntVec3 c = parent.Position + parent.Rotation.FacingCell * -1;
+                Building support = c.GetEdifice();
+                if( ( support == null )||
+                    ( ( support.def.graphicData.linkFlags & ( LinkFlags.Rock | LinkFlags.Wall ) ) == 0 ) ) {
+                    DestroyParent();
+                    return;
+                }
+            }
+
+            // Check surface
+            if( PlaceWorkers.FindIndex( p => p.GetType() == typeof( PlaceWorker_OnlyOnSurface ) ) >= 0 ) {
+                bool foundThing = false;
+                foreach( Thing t in parent.Position.GetThingList() ) {
+                    if( t.def.surfaceType != SurfaceType.None ) {
+                        foundThing = true;
+                        break;
+                    }
+                }
+                if( foundThing == false ) {
+                    DestroyParent();
+                    return;
+                }
+            }
+
+            // Check on thing
+            if( PlaceWorkers.FindIndex( p => p.GetType() == typeof( PlaceWorker_OnlyOnThing ) ) >= 0 ) {
+                bool foundThing = false;
+                foreach( Thing t in parent.Position.GetThingList() ){
+                    if( ( Restrictions.RestrictedThing.Find( r => r == t.def ) != null )&&
+                        ( t.Position == parent.Position ) ) {
+                        foundThing = true;
+                        break;
+                    }
+                }
+                if( foundThing == false ) {
+                    DestroyParent();
+                    return;
+                }
+            }
+
+        }
     }
 }
 
diff --git a/_Mod/Community Core Library/About/About.xml b/_Mod/Community Core Library/About/About.xml
index 552f42a..2103378 100644
--- a/_Mod/Community Core Library/About/About.xml	
+++ b/_Mod/Community Core Library/About/About.xml	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ModMetaData>
-    <name>Community Core Library v0.11.2</name>
+    <name>Community Core Library v0.11.3</name>
     <author>1000101</author>
     <url>https://ludeon.com/forums/index.php?topic=14172.0</url>
     <targetVersion>RimWorld Alpha 11b</targetVersion>
diff --git a/_Mod/Community Core Library/Assemblies/Community Core Library.dll b/_Mod/Community Core Library/Assemblies/Community Core Library.dll
index 1cdfa19..b2c569e 100644
Binary files a/_Mod/Community Core Library/Assemblies/Community Core Library.dll and b/_Mod/Community Core Library/Assemblies/Community Core Library.dll differ
diff --git a/_Mod/Community Core Library/Languages/English/Keyed/PlaceWorkers.xml b/_Mod/Community Core Library/Languages/English/Keyed/PlaceWorkers.xml
index ce42e4c..5148d97 100644
--- a/_Mod/Community Core Library/Languages/English/Keyed/PlaceWorkers.xml	
+++ b/_Mod/Community Core Library/Languages/English/Keyed/PlaceWorkers.xml	
@@ -8,5 +8,7 @@
     <MessagePlacementCountRestricted>Can not have more than: </MessagePlacementCountRestricted>
     <MessagePlacementNotOn>You can not place that on </MessagePlacementNotOn>
     <MessagePlacementNotHere>You can not place that here!</MessagePlacementNotHere>
-
+    <AlertPlaceWorkerRestrictionSupportRemovedLabel>A support was removed!</AlertPlaceWorkerRestrictionSupportRemovedLabel>
+    <AlertPlaceWorkerRestrictionSupportRemovedDesc>Something has been destroyed because it's support has been removed or destroyed!\n\nThe following things have been destroyed because their supports are missing:</AlertPlaceWorkerRestrictionSupportRemovedDesc>
+    
 </LanguageData>
\ No newline at end of file
diff --git a/_Mod/Modders Resource/PlaceWorkers/PlaceWorker_Restrictions/Defs/ThingDefs/Buildings_PlaceWorker_Restrictions.xml b/_Mod/Modders Resource/PlaceWorkers/PlaceWorker_Restrictions/Defs/ThingDefs/Buildings_PlaceWorker_Restrictions.xml
index 2f8f3c6..bd421cb 100644
--- a/_Mod/Modders Resource/PlaceWorkers/PlaceWorker_Restrictions/Defs/ThingDefs/Buildings_PlaceWorker_Restrictions.xml	
+++ b/_Mod/Modders Resource/PlaceWorkers/PlaceWorker_Restrictions/Defs/ThingDefs/Buildings_PlaceWorker_Restrictions.xml	
@@ -13,6 +13,48 @@
         <filthLeaving>BuildingRubble</filthLeaving>
     </ThingDef>
 
+    <ThingDef ParentName="BuildingBase">
+        <defName>RestrictedUnderRoof</defName>
+        <label>restricted under roof test</label>
+        <thingClass>Building</thingClass>
+        <graphicData>
+            <texPath>Things/Building/Furniture/LampStanding</texPath>
+            <graphicClass>Graphic_Single</graphicClass>
+            <shadowInfo>
+                <basewidth>0.3</basewidth>
+                <baseHeight>0.3</baseHeight>
+                <tallness>0.6</tallness>
+                <offset>(0,0,-0.1)</offset>
+            </shadowInfo>
+        </graphicData>
+        <altitudeLayer>Waist</altitudeLayer>
+        <passability>PassThroughOnly</passability>
+        <statBases>
+            <MaxHitPoints>50</MaxHitPoints>
+            <WorkToMake>115</WorkToMake>
+            <Flammability>1.0</Flammability>
+        </statBases>
+        <selectable>true</selectable>
+        <description>Restricted to being under a roof</description>
+        <costList>
+            <Steel>1</Steel>
+        </costList>
+        <leaveResourcesWhenKilled>false</leaveResourcesWhenKilled>
+        <soundImpactDefault>BulletImpactMetal</soundImpactDefault>
+        <comps>
+            <li Class="CommunityCoreLibrary.RestrictedPlacement_Properties">
+                <compClass>CommunityCoreLibrary.RestrictedPlacement_Comp</compClass>
+            </li>
+        </comps>
+        <placeWorkers>
+            <!-- This restriction needs a ticker to maintain -->
+            <li>CommunityCoreLibrary.PlaceWorker_OnlyUnderRoof</li>
+        </placeWorkers>
+        <designationCategory>Furniture</designationCategory>
+        <rotatable>false</rotatable>
+        <designationHotKey/>
+    </ThingDef>
+
     <ThingDef ParentName="BuildingBase">
         <defName>RestrictedCountTest</defName>
         <label>restricted count test</label>
@@ -48,6 +90,7 @@
             </li>
         </comps>
         <placeWorkers>
+            <!-- This restriction does not need a ticker to maintain -->
             <li>CommunityCoreLibrary.PlaceWorker_RestrictedCount</li>
         </placeWorkers>
         <designationCategory>Furniture</designationCategory>
@@ -94,6 +137,7 @@
         </comps>
         <terrainAffordanceNeeded>Any</terrainAffordanceNeeded>
         <placeWorkers>
+            <!-- This restriction does not need a ticker to maintain -->
             <li>CommunityCoreLibrary.PlaceWorker_NotOnTerrain</li>
         </placeWorkers>
         <designationCategory>Furniture</designationCategory>
@@ -140,6 +184,7 @@
         </comps>
         <terrainAffordanceNeeded>Any</terrainAffordanceNeeded>
         <placeWorkers>
+            <!-- This restriction does not need a ticker to maintain -->
             <li>CommunityCoreLibrary.PlaceWorker_OnlyOnTerrain</li>
         </placeWorkers>
         <designationCategory>Furniture</designationCategory>
@@ -191,6 +236,7 @@
         </comps>
         <terrainAffordanceNeeded>Heavy</terrainAffordanceNeeded>
         <placeWorkers>
+            <!-- This restriction does not need a ticker to maintain -->
             <li>CommunityCoreLibrary.PlaceWorker_NotOnThing</li>
         </placeWorkers>
         <designationCategory>Furniture</designationCategory>
@@ -241,7 +287,9 @@
             </li>
         </comps>
         <terrainAffordanceNeeded>Heavy</terrainAffordanceNeeded>
+        <tickerType>Rare</tickerType>
         <placeWorkers>
+            <!-- This restriction needs a ticker to maintain -->
             <li>CommunityCoreLibrary.PlaceWorker_OnlyOnThing</li>
         </placeWorkers>
         <designationCategory>Furniture</designationCategory>