diff --git a/src/main/java/com/hbm/blocks/generic/BlockGrate.java b/src/main/java/com/hbm/blocks/generic/BlockGrate.java
index f0fad0edd..e7240b485 100644
--- a/src/main/java/com/hbm/blocks/generic/BlockGrate.java
+++ b/src/main/java/com/hbm/blocks/generic/BlockGrate.java
@@ -110,14 +110,14 @@ public class BlockGrate extends Block implements ITooltipProvider {
 			if(meta == 0) {
 				// Check that the block below can fit a grate above it
 				Block block = world.getBlock(x, y - 1, z);
-				AxisAlignedBB bb = block.getCollisionBoundingBoxFromPool(world, x, y - 1, z);
-				if(!block.isAir(world, x, y + 1, z) && (bb == null || (int) ((bb.maxY - (y - 1)) * 100) < 90)) {
+				AxisAlignedBB otherBB = block.getSelectedBoundingBoxFromPool(world, x, y - 1, z);
+				if(!block.isAir(world, x, y + 1, z) && (otherBB == null || otherBB.maxY - (double)y < -0.05)) {
 					world.setBlockMetadataWithNotify(x, y, z, 9, 3);
 				}
 			} else if(meta == 7) {
 				Block block = world.getBlock(x, y + 1, z);
-				AxisAlignedBB bb = block.getCollisionBoundingBoxFromPool(world, x, y + 1, z);
-				if(!block.isAir(world, x, y + 1, z) && (bb == null || (int) ((bb.minY - (y + 1)) * 100) > 10)) {
+				AxisAlignedBB otherBB = block.getSelectedBoundingBoxFromPool(world, x, y + 1, z);
+				if(!block.isAir(world, x, y + 1, z) && (otherBB == null || otherBB.minY - (double)(y + 1) > 0.05)) {
 					world.setBlockMetadataWithNotify(x, y, z, 8, 3);
 				}
 			}
@@ -133,15 +133,11 @@ public class BlockGrate extends Block implements ITooltipProvider {
 		boolean breakIt = false;
 
 		if(meta == 9) {
-			AxisAlignedBB bb = world.getBlock(x, y - 1, z).getCollisionBoundingBoxFromPool(world, x, y - 1, z);
-			if(bb != null && (int) ((bb.maxY - (y - 1)) * 100) >= 90) {
-				breakIt = true;
-			}
+			AxisAlignedBB otherBB = world.getBlock(x, y - 1, z).getSelectedBoundingBoxFromPool(world, x, y - 1, z);
+			breakIt = !(otherBB == null || otherBB.maxY - (double)y < -0.05);
 		} else if(meta == 8) {
-			AxisAlignedBB bb = world.getBlock(x, y + 1, z).getCollisionBoundingBoxFromPool(world, x, y + 1, z);
-			if(bb != null && (int) ((bb.minY - (y + 1)) * 100) <= 10) {
-				breakIt = true;
-			}
+			AxisAlignedBB otherBB = world.getBlock(x, y + 1, z).getSelectedBoundingBoxFromPool(world, x, y + 1, z);
+			breakIt = !(otherBB == null || otherBB.minY - (double)(y + 1) > 0.05);
 		}
 
 		if(breakIt) {