what to support a reccessed shelf
On the partition wall I am setting up, I opened a "window" to have a reccessed shelf on one side. Basically, I will leave one side of the "window" open, without covering drywall, and the other side of the "window" covered. The window/recessed shelf is about 4'X5'.
Now the question is what should I use to add strength to the one sided open space? If I only use drywall on one side, people may just lean on the open side and break the drywall on the opposite side.