diff --git a/mods/default/nodes.lua b/mods/default/nodes.lua
index bd442019..59cd4c7e 100644
--- a/mods/default/nodes.lua
+++ b/mods/default/nodes.lua
@@ -220,6 +220,7 @@ minetest.register_node("default:clay", {
 minetest.register_node("default:brick", {
 	description = "Brick Block",
 	tiles = {"default_brick.png"},
+	is_ground_content = false,
 	groups = {cracky=3},
 	sounds = default.node_sound_stone_defaults(),
 })
@@ -228,6 +229,7 @@ minetest.register_node("default:tree", {
 	description = "Tree",
 	tiles = {"default_tree_top.png", "default_tree_top.png", "default_tree.png"},
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	groups = {tree=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
 	sounds = default.node_sound_wood_defaults(),
 	on_place = minetest.rotate_node
@@ -237,6 +239,7 @@ minetest.register_node("default:jungletree", {
 	description = "Jungle Tree",
 	tiles = {"default_jungletree_top.png", "default_jungletree_top.png", "default_jungletree.png"},
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	groups = {tree=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
 	sounds = default.node_sound_wood_defaults(),
 	on_place = minetest.rotate_node
@@ -255,6 +258,7 @@ minetest.register_node("default:jungleleaves", {
 	visual_scale = 1.3,
 	tiles = {"default_jungleleaves.png"},
 	paramtype = "light",
+	is_ground_content = false,
 	groups = {snappy=3, leafdecay=3, flammable=2, leaves=1},
 	drop = {
 		max_items = 1,
@@ -316,6 +320,7 @@ minetest.register_node("default:leaves", {
 	visual_scale = 1.3,
 	tiles = {"default_leaves.png"},
 	paramtype = "light",
+	is_ground_content = false,
 	groups = {snappy=3, leafdecay=3, flammable=2, leaves=1},
 	drop = {
 		max_items = 1,
@@ -365,6 +370,7 @@ minetest.register_node("default:papyrus", {
 minetest.register_node("default:bookshelf", {
 	description = "Bookshelf",
 	tiles = {"default_wood.png", "default_wood.png", "default_bookshelf.png"},
+	is_ground_content = false,
 	groups = {choppy=3,oddly_breakable_by_hand=2,flammable=3},
 	sounds = default.node_sound_wood_defaults(),
 })
@@ -376,6 +382,7 @@ minetest.register_node("default:glass", {
 	inventory_image = minetest.inventorycube("default_glass.png"),
 	paramtype = "light",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	groups = {cracky=3,oddly_breakable_by_hand=3},
 	sounds = default.node_sound_glass_defaults(),
 })
@@ -387,6 +394,7 @@ minetest.register_node("default:fence_wood", {
 	inventory_image = "default_fence.png",
 	wield_image = "default_fence.png",
 	paramtype = "light",
+	is_ground_content = false,
 	selection_box = {
 		type = "fixed",
 		fixed = {-1/7, -1/2, -1/7, 1/7, 1/2, 1/7},
@@ -403,6 +411,7 @@ minetest.register_node("default:rail", {
 	wield_image = "default_rail.png",
 	paramtype = "light",
 	walkable = false,
+	is_ground_content = false,
 	selection_box = {
 		type = "fixed",
                 -- but how to specify the dimensions for curved and sideways rails?
@@ -421,6 +430,7 @@ minetest.register_node("default:ladder", {
 	paramtype2 = "wallmounted",
 	walkable = false,
 	climbable = true,
+	is_ground_content = false,
 	selection_box = {
 		type = "wallmounted",
 		--wall_top = = <default>
@@ -596,6 +606,7 @@ minetest.register_node("default:torch", {
 	paramtype = "light",
 	paramtype2 = "wallmounted",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = LIGHT_MAX-1,
 	selection_box = {
@@ -618,6 +629,7 @@ minetest.register_node("default:sign_wall", {
 	paramtype = "light",
 	paramtype2 = "wallmounted",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	walkable = false,
 	selection_box = {
 		type = "wallmounted",
@@ -667,6 +679,7 @@ minetest.register_node("default:chest", {
 	paramtype2 = "facedir",
 	groups = {choppy=2,oddly_breakable_by_hand=2},
 	legacy_facedir_simple = true,
+	is_ground_content = false,
 	sounds = default.node_sound_wood_defaults(),
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
@@ -708,6 +721,7 @@ minetest.register_node("default:chest_locked", {
 	paramtype2 = "facedir",
 	groups = {choppy=2,oddly_breakable_by_hand=2},
 	legacy_facedir_simple = true,
+	is_ground_content = false,
 	sounds = default.node_sound_wood_defaults(),
 	after_place_node = function(pos, placer)
 		local meta = minetest.get_meta(pos)
@@ -811,6 +825,7 @@ minetest.register_node("default:furnace", {
 	paramtype2 = "facedir",
 	groups = {cracky=2},
 	legacy_facedir_simple = true,
+	is_ground_content = false,
 	sounds = default.node_sound_stone_defaults(),
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
@@ -881,6 +896,7 @@ minetest.register_node("default:furnace_active", {
 	drop = "default:furnace",
 	groups = {cracky=2, not_in_creative_inventory=1,hot=1},
 	legacy_facedir_simple = true,
+	is_ground_content = false,
 	sounds = default.node_sound_stone_defaults(),
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
@@ -1126,6 +1142,7 @@ minetest.register_node("default:obsidian_glass", {
 	drawtype = "glasslike",
 	tiles = {"default_obsidian_glass.png"},
 	paramtype = "light",
+	is_ground_content = false,
 	sunlight_propagates = true,
 	sounds = default.node_sound_glass_defaults(),
 	groups = {cracky=3,oddly_breakable_by_hand=3},
@@ -1145,6 +1162,7 @@ minetest.register_node("default:nyancat", {
 		"default_nc_side.png", "default_nc_back.png", "default_nc_front.png"},
 	paramtype2 = "facedir",
 	groups = {cracky=2},
+	is_ground_content = false,
 	legacy_facedir_simple = true,
 	sounds = default.node_sound_defaults(),
 })
@@ -1155,6 +1173,7 @@ minetest.register_node("default:nyancat_rainbow", {
 		"default_nc_rb.png", "default_nc_rb.png"},
 	paramtype2 = "facedir",
 	groups = {cracky=2},
+	is_ground_content = false,
 	sounds = default.node_sound_defaults(),
 })