ripping off my own code

code/game/turfs/closed.dm

@@ -6,6 +6,8 @@
 	blocks_air = 1
 	rad_flags = RAD_PROTECT_CONTENTS | RAD_NO_CONTAMINATE
 	rad_insulation = RAD_MEDIUM_INSULATION
+	/// How much we block yelling
+	var/yelling_resistance = 40
 
 /turf/closed/Initialize()
 	. = ..()
@@ -198,16 +200,19 @@
 	desc = "A wall made out of a strange metal. The squares on it pulse in a predictable pattern."
 	icon = 'icons/turf/walls/hierophant_wall.dmi'
 	icon_state = "wall"
-	
+
 /turf/closed/indestructible/rock/glacierrock
 	name = "unaturally hard ice wall"
 	desc = "Ice, hardened over thousands of years, you're not breaking through this."
 	icon = 'icons/turf/walls.dmi'
 	icon_state = "snow_rock"
-	
+
 /turf/closed/indestructible/rock/glacierrock/blue
 	name = "blue ice wall"
 	desc = "The incredible compressive forces that formed this sturdy ice wall gave it a blue color."
 	icon = 'icons/turf/walls.dmi'
 	icon_state = "ice"
 	canSmoothWith = list(/turf/closed/indestructible/rock/glacierrock/blue)
+
+/turf/closed/get_yelling_resistance()
+	return yelling_resistance

code/game/turfs/turf.dm

@@ -594,3 +594,14 @@ GLOBAL_LIST_EMPTY(station_turfs)
 	. = ..()
 	if(. != BULLET_ACT_FORCE_PIERCE)
 		. =  BULLET_ACT_TURF
+
+/turf/proc/get_yelling_resistance()
+	. = 0
+	// don't bother checking fulltile, we don't need accuracy
+	var/obj/structure/window/W = locate() in src
+	if(W)
+		. += 7
+	for(var/obj/machinery/door/D in src)
+		if(!D.density)
+			continue
+		. += D.opacity? 7 : 15