diff --git a/res/textures/blocks/struct_air.png b/res/textures/blocks/struct_air.png
new file mode 100644
index 00000000..d5a7de09
Binary files /dev/null and b/res/textures/blocks/struct_air.png differ
diff --git a/src/constants.hpp b/src/constants.hpp
index 9766bcc8..e99c1c7f 100644
--- a/src/constants.hpp
+++ b/src/constants.hpp
@@ -24,6 +24,7 @@ inline constexpr uint MAX_OPEN_REGION_FILES = 32;
 
 inline constexpr blockid_t BLOCK_AIR = 0;
 inline constexpr blockid_t BLOCK_OBSTACLE = 1;
+inline constexpr blockid_t BLOCK_STRUCT_AIR = 2;
 inline constexpr itemid_t ITEM_EMPTY = 0;
 inline constexpr entityid_t ENTITY_NONE = 0;
 
diff --git a/src/core_defs.cpp b/src/core_defs.cpp
index 5fe46341..7d19acd1 100644
--- a/src/core_defs.cpp
+++ b/src/core_defs.cpp
@@ -23,9 +23,10 @@ void corecontent::setup(EnginePaths* paths, ContentBuilder* builder) {
         block.model = BlockModel::none;
         block.pickingItem = CORE_EMPTY;
     }
-
-    ItemDef& item = builder->items.create(CORE_EMPTY);
-    item.iconType = item_icon_type::none;
+    {
+        ItemDef& item = builder->items.create(CORE_EMPTY);
+        item.iconType = item_icon_type::none;
+    }
 
     auto bindsFile = paths->getResourcesFolder()/fs::path("bindings.toml");
     if (fs::is_regular_file(bindsFile)) {
@@ -47,4 +48,20 @@ void corecontent::setup(EnginePaths* paths, ContentBuilder* builder) {
         item.placingBlock = CORE_OBSTACLE;
         item.caption = block.caption;
     }
+    {
+        Block& block = builder->blocks.create(CORE_STRUCT_AIR);
+        for (uint i = 0; i < 6; i++) {
+            block.textureFaces[i] = "struct_air";
+        }
+        block.drawGroup = -1;
+        block.skyLightPassing = true;
+        block.lightPassing = true;
+        block.hitboxes = {AABB()};
+        block.obstacle = false;
+        ItemDef& item = builder->items.create(CORE_STRUCT_AIR+".item");
+        item.iconType = item_icon_type::block;
+        item.icon = CORE_STRUCT_AIR;
+        item.placingBlock = CORE_STRUCT_AIR;
+        item.caption = block.caption;
+    }
 }
diff --git a/src/core_defs.hpp b/src/core_defs.hpp
index ccfa2e69..0f25de3a 100644
--- a/src/core_defs.hpp
+++ b/src/core_defs.hpp
@@ -3,8 +3,9 @@
 #include <string>
 
 inline const std::string CORE_EMPTY = "core:empty";
-inline const std::string CORE_OBSTACLE = "core:obstacle";
 inline const std::string CORE_AIR = "core:air";
+inline const std::string CORE_OBSTACLE = "core:obstacle";
+inline const std::string CORE_STRUCT_AIR = "core:struct_air";
 
 inline const std::string TEXTURE_NOTFOUND = "notfound";
 
diff --git a/src/world/generator/WorldGenerator.cpp b/src/world/generator/WorldGenerator.cpp
index 365a63fc..e31f3cb0 100644
--- a/src/world/generator/WorldGenerator.cpp
+++ b/src/world/generator/WorldGenerator.cpp
@@ -348,7 +348,11 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
                     const auto& structVoxel = 
                         structVoxels[vox_index(x, y, z, size.x, size.z)];
                     if (structVoxel.id) {
-                        voxels[vox_index(sx, sy, sz)] = structVoxel;
+                        if (structVoxel.id == BLOCK_STRUCT_AIR) {
+                            voxels[vox_index(sx, sy, sz)] = {0, {}};
+                        } else {
+                            voxels[vox_index(sx, sy, sz)] = structVoxel;
+                        }
                     }
                 }
             }