I was remodeling a den that still had 70's decor. Under the wood paneling I found mold due to a very old previous leak, so I had to remove the drywall. Underneath I found an interior brick wall though. At the top you can see in to the attic. I was looking for ideas. I obviously will have to insulate and seal the opening, but how is the question. Also, I assume that I need to clean and finish the brick to leave it open. Any ideas out there?