Recursive explosion resistance values for walls, space tiles, grilles and airlocks tweaked

Lattices now spawn properly when a floor tile is destroyed by an explosion. Probabilities involved tweaked

code/game/turfs/simulated/floor.dm

@@ -82,19 +82,19 @@ var/list/wood_icons = list("wood","wood-broken")
 		if(1.0)
 			src.ChangeTurf(/turf/space)
 		if(2.0)
-			switch(pick(1,2;75,3))
+			switch(pick(40;1,40;2,3))
 				if (1)
-					src.ReplaceWithLattice()
 					if(prob(33)) new /obj/item/stack/sheet/metal(src)
+					src.ReplaceWithLattice()
 				if(2)
 					src.ChangeTurf(/turf/space)
 				if(3)
+					if(prob(33)) new /obj/item/stack/sheet/metal(src)
 					if(prob(80))
 						src.break_tile_to_plating()
 					else
 						src.break_tile()
 					src.hotspot_expose(1000,CELL_VOLUME)
-					if(prob(33)) new /obj/item/stack/sheet/metal(src)
 		if(3.0)
 			if (prob(50))
 				src.break_tile()

code/game/turfs/turf.dm

@@ -338,7 +338,8 @@
 
 /turf/proc/ReplaceWithLattice()
 	src.ChangeTurf(/turf/space)
-	new /obj/structure/lattice( locate(src.x, src.y, src.z) )
+	spawn()
+		new /obj/structure/lattice( locate(src.x, src.y, src.z) )
 
 /turf/proc/kill_creatures(mob/U = null)//Will kill people/creatures and damage mechs./N
 //Useful to batch-add creatures to the list.