diff --git a/code/__DEFINES/obj_flags.dm b/code/__DEFINES/obj_flags.dm
index b73d5bc5252..633df072511 100644
--- a/code/__DEFINES/obj_flags.dm
+++ b/code/__DEFINES/obj_flags.dm
@@ -10,7 +10,10 @@
 #define UNIQUE_RENAME			(1<<6) // can you customize the description/name of the thing?
 #define USES_TGUI				(1<<7)	//put on things that use tgui on ui_interact instead of custom/old UI.
 #define FROZEN					(1<<8)
-#define BLOCK_Z_FALL			(1<<9) // Should this object block z falling?
+#define BLOCK_Z_OUT_DOWN		(1<<9)  // Should this object block z falling from loc?
+#define BLOCK_Z_OUT_UP			(1<<10) // Should this object block z uprise from loc?
+#define BLOCK_Z_IN_DOWN			(1<<11) // Should this object block z falling from above?
+#define BLOCK_Z_IN_UP			(1<<12) // Should this object block z uprise from below?
 
 // If you add new ones, be sure to add them to /obj/Initialize as well for complete mapping support
 
diff --git a/code/game/objects/structures/ladders.dm b/code/game/objects/structures/ladders.dm
index 63fae9f4548..a1bdf9fa198 100644
--- a/code/game/objects/structures/ladders.dm
+++ b/code/game/objects/structures/ladders.dm
@@ -7,6 +7,7 @@
 	anchored = TRUE
 	var/obj/structure/ladder/down   //the ladder below this one
 	var/obj/structure/ladder/up     //the ladder above this one
+	obj_flags = CAN_BE_HIT | BLOCK_Z_OUT_DOWN
 
 /obj/structure/ladder/Initialize(mapload, obj/structure/ladder/up, obj/structure/ladder/down)
 	..()
diff --git a/code/game/objects/structures/lattice.dm b/code/game/objects/structures/lattice.dm
index a977b077a4c..75595234a14 100644
--- a/code/game/objects/structures/lattice.dm
+++ b/code/game/objects/structures/lattice.dm
@@ -17,6 +17,7 @@
 	/obj/structure/falsewall)
 	smooth = SMOOTH_MORE
 	//	flags = CONDUCT_1
+	obj_flags = CAN_BE_HIT | BLOCK_Z_OUT_DOWN
 
 /obj/structure/lattice/examine(mob/user)
 	. = ..()
@@ -77,7 +78,7 @@
 	number_of_mats = 2
 	smooth = SMOOTH_TRUE
 	canSmoothWith = null
-	obj_flags = CAN_BE_HIT | BLOCK_Z_FALL
+	obj_flags = CAN_BE_HIT | BLOCK_Z_OUT_DOWN | BLOCK_Z_IN_UP
 
 /obj/structure/lattice/catwalk/deconstruction_hints(mob/user)
 	return "<span class='notice'>The supporting rods look like they could be <b>cut</b>.</span>"
@@ -103,7 +104,7 @@
 	color = "#5286b9ff"
 	smooth = SMOOTH_TRUE
 	canSmoothWith = null
-	obj_flags = CAN_BE_HIT | BLOCK_Z_FALL
+	obj_flags = CAN_BE_HIT | BLOCK_Z_OUT_DOWN | BLOCK_Z_IN_UP
 	resistance_flags = FIRE_PROOF | LAVA_PROOF
 
 /obj/structure/lattice/lava/deconstruction_hints(mob/user)
diff --git a/code/game/turfs/open/_open.dm b/code/game/turfs/open/_open.dm
index 29d560d952f..eada9138ebd 100644
--- a/code/game/turfs/open/_open.dm
+++ b/code/game/turfs/open/_open.dm
@@ -18,11 +18,21 @@
 
 //direction is direction of travel of A
 /turf/open/zPassIn(atom/movable/A, direction, turf/source)
-	return (direction == DOWN)
+	if(direction == DOWN)
+		for(var/obj/O in contents)
+			if(O.obj_flags & BLOCK_Z_IN_DOWN)
+				return FALSE
+		return TRUE
+	return FALSE
 
 //direction is direction of travel of A
 /turf/open/zPassOut(atom/movable/A, direction, turf/destination)
-	return (direction == UP)
+	if(direction == UP)
+		for(var/obj/O in contents)
+			if(O.obj_flags & BLOCK_Z_OUT_UP)
+				return FALSE
+		return TRUE
+	return FALSE
 
 //direction is direction of travel of air
 /turf/open/zAirIn(direction, turf/source)
diff --git a/code/game/turfs/open/openspace.dm b/code/game/turfs/open/openspace.dm
index 359450d994a..f3b4a1ddc99 100644
--- a/code/game/turfs/open/openspace.dm
+++ b/code/game/turfs/open/openspace.dm
@@ -51,15 +51,32 @@ GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdr
 	return TRUE
 
 /turf/open/transparent/openspace/zPassIn(atom/movable/A, direction, turf/source)
-	return TRUE
+	if(direction == DOWN)
+		for(var/obj/O in contents)
+			if(O.obj_flags & BLOCK_Z_IN_DOWN)
+				return FALSE
+		return TRUE
+	if(direction == UP)
+		for(var/obj/O in contents)
+			if(O.obj_flags & BLOCK_Z_IN_UP)
+				return FALSE
+		return TRUE
+	return FALSE
 
 /turf/open/transparent/openspace/zPassOut(atom/movable/A, direction, turf/destination)
 	if(A.anchored)
 		return FALSE
-	for(var/obj/O in contents)
-		if(O.obj_flags & BLOCK_Z_FALL)
-			return FALSE
-	return TRUE
+	if(direction == DOWN)
+		for(var/obj/O in contents)
+			if(O.obj_flags & BLOCK_Z_OUT_DOWN)
+				return FALSE
+		return TRUE
+	if(direction == UP)
+		for(var/obj/O in contents)
+			if(O.obj_flags & BLOCK_Z_OUT_UP)
+				return FALSE
+		return TRUE
+	return FALSE
 
 /turf/open/transparent/openspace/proc/CanCoverUp()
 	return can_cover_up
diff --git a/code/modules/awaymissions/away_props.dm b/code/modules/awaymissions/away_props.dm
index 9a12d14ff2a..6c58238bb00 100644
--- a/code/modules/awaymissions/away_props.dm
+++ b/code/modules/awaymissions/away_props.dm
@@ -60,7 +60,7 @@
 	icon_state = "lattice"
 	plane = FLOOR_PLANE
 	anchored = TRUE
-	obj_flags = CAN_BE_HIT | BLOCK_Z_FALL
+	obj_flags = CAN_BE_HIT | BLOCK_Z_OUT_DOWN | BLOCK_Z_IN_UP
 	var/id
 	var/open = FALSE
 	var/hidden = FALSE
@@ -87,10 +87,10 @@
 	var/talpha
 	if(open)
 		talpha = 0
-		obj_flags &= ~BLOCK_Z_FALL
+		obj_flags &= ~(BLOCK_Z_OUT_DOWN | BLOCK_Z_IN_UP)
 	else
 		talpha = 255
-		obj_flags |= BLOCK_Z_FALL
+		obj_flags |= BLOCK_Z_OUT_DOWN | BLOCK_Z_IN_UP
 	plane = BYOND_LIGHTING_LAYER //What matters it's one above openspace, so our animation is not dependant on what's there. Up to revision with 513
 	animate(src,alpha = talpha,time = 10)
 	addtimer(CALLBACK(src,.proc/reset_plane),10)