That is complex answer, by themselves no. But put in simple term each obstacle that a bullet travels through, effects terminal ballistics. Degrading overall energy and effecting path of flight. When you are talking about drywall, nails, conduit, 2x4s, everything else you find in walls will increase survivability. That is not including the value of corners. It ain't much but it's something.
Sent from my iPhone using Tapatalk