you mean like a attic? as long as you can get air to stop condensation i dont see why you cant,you know there is another idea just snapped in my head ,oh hell hahahah,have you ever heard or red guard? that is a rubberized coating used in walls behind showers ,i used that on a bathroom remoldle and work really well,shit goes on pink and when it turns red it dry,and just like a rubber coat,as long as you dont penetrate it with a screw or nail it is a rubber coating,shit was pretty high though,like 45 bucks a quart,but we have serious temp swings here so i had to