I moved a similar sized safe by sliding it on 3/4 inch sanded plywood. I did not use any grease or anything because I did not want it to end up on the floor in a spot where I needed to push. It was hard enough without having to worry about slipping and falling on my rear end. I had to walk it and slide it to get it to move. The 1/2 gap might prove challenging, but I imagine you can work it in there. Now getting back out again, if required, might be a tad more difficult. I moved mine by myself, I would not suggest that