Hi, I noticed that some of the brick by my front door seems to be turning into powder. The other side of the brick is not exposed to the outside of the house, but i'm not too sure what means i need to take to prevent more decomposition. is this a serious issue? Do I need to replace all of the brick? this seems like it could be a very serious job, but i'm not sure? I've attatched a picture of what I'm talking about. any help would be greatly appreciated!
I suppose it is possible that one brick missed the kiln, but that can happen to some types of brick when in very wet conditions. If unsure how to prodeed, I would have a good local mason check things out.