diff --git a/src/main/java/com/sk89q/worldedit/blocks/BlockType.java b/src/main/java/com/sk89q/worldedit/blocks/BlockType.java
index 8f9e2f53b..f3f77955e 100644
--- a/src/main/java/com/sk89q/worldedit/blocks/BlockType.java
+++ b/src/main/java/com/sk89q/worldedit/blocks/BlockType.java
@@ -437,7 +437,8 @@ public enum BlockType {
         canPassThrough.add(BlockID.REDSTONE_TORCH_OFF);
         canPassThrough.add(BlockID.REDSTONE_TORCH_ON);
         canPassThrough.add(BlockID.STONE_BUTTON);
-        canPassThrough.add(BlockID.SNOW);
+        canPassThrough.add(-16*BlockID.SNOW-0);
+        canPassThrough.add(-16*BlockID.SNOW-8);
         canPassThrough.add(BlockID.REED);
         canPassThrough.add(BlockID.PORTAL);
         canPassThrough.add(BlockID.REDSTONE_REPEATER_OFF);
@@ -512,6 +513,9 @@ public enum BlockType {
         centralTopLimit.put(BlockID.BED, 0.5625);
         centralTopLimit.put(BlockID.BREWING_STAND, 0.875);
         centralTopLimit.put(BlockID.CAKE_BLOCK, 0.4375);
+        for (int data = 6; data < 16; ++data) {
+            centralTopLimit.put(-16*BlockID.CAKE_BLOCK-data, 0.0);
+        }
         centralTopLimit.put(BlockID.CAULDRON, 0.3125);
         centralTopLimit.put(BlockID.COCOA_PLANT, 0.750);
         centralTopLimit.put(BlockID.ENCHANTMENT_TABLE, 0.75);
@@ -524,13 +528,10 @@ public enum BlockType {
             }
             centralTopLimit.put(-16*BlockID.HEAD-data, 0.75);
         }
-        // Default value to be used if no data value is given
-        centralTopLimit.put(BlockID.HEAD, 0.75);
         // Heads on the floor are lower
         centralTopLimit.put(-16*BlockID.HEAD-1, 0.5);
         centralTopLimit.put(-16*BlockID.HEAD-9, 0.5);
         centralTopLimit.put(BlockID.FENCE, 1.5);
-        centralTopLimit.put(BlockID.FENCE_GATE, 1.5);
         for (int data = 0; data < 8; ++data) {
             centralTopLimit.put(-16*BlockID.STEP-data, 0.5);
             centralTopLimit.put(-16*BlockID.WOODEN_STEP-data, 0.5);
@@ -540,13 +541,28 @@ public enum BlockType {
         centralTopLimit.put(BlockID.LILY_PAD, 0.015625);
         centralTopLimit.put(BlockID.REDSTONE_REPEATER_ON, .125);
         centralTopLimit.put(BlockID.REDSTONE_REPEATER_OFF, .125);
-        centralTopLimit.put(BlockID.TRAP_DOOR, 0.1875);
+        for (int data = 0; data < 4; ++data) {
+            centralTopLimit.put(-16*BlockID.TRAP_DOOR-(data+ 0), 0.1875); // closed lower trap doors
+            centralTopLimit.put(-16*BlockID.TRAP_DOOR-(data+ 4), 0.0); // opened lower trap doors
+            centralTopLimit.put(-16*BlockID.TRAP_DOOR-(data+ 8), 1.0); // closed upper trap doors
+            centralTopLimit.put(-16*BlockID.TRAP_DOOR-(data+12), 0.0); // opened upper trap doors
+
+            centralTopLimit.put(-16*BlockID.FENCE_GATE-(data+ 0), 1.5);
+            centralTopLimit.put(-16*BlockID.FENCE_GATE-(data+ 4), 0.0);
+            centralTopLimit.put(-16*BlockID.FENCE_GATE-(data+ 8), 1.5);
+            centralTopLimit.put(-16*BlockID.FENCE_GATE-(data+12), 0.0);
+        }
         centralTopLimit.put(BlockID.SLOW_SAND, 0.875);
         centralTopLimit.put(BlockID.COBBLESTONE_WALL, 1.5);
         centralTopLimit.put(BlockID.FLOWER_POT, 0.375);
         centralTopLimit.put(BlockID.COMPARATOR_OFF, .125);
         centralTopLimit.put(BlockID.COMPARATOR_ON, .125);
         centralTopLimit.put(BlockID.DAYLIGHT_SENSOR, 0.375);
+
+        // Some default values to be used if no data value is given
+        centralTopLimit.put(BlockID.HEAD, 0.75);
+        centralTopLimit.put(BlockID.TRAP_DOOR, 1.0);
+        centralTopLimit.put(BlockID.FENCE_GATE, 1.5);
     }
 
     /**