Quote Originally Posted by Halfdawg View Post
I am going to put some casters on the bottom. Do you think that 5 would be good, having the 5th in the center?

Now that Mat mentioned the sag the melamine would have over time I think a thick backing material nailed or screwed every 4 to 6 inches on each level should support the shelf from sagging.

What do you think?

Richard
I just built a melamine rack similar to yours (couple post down) mine is a little smaller than yours but I used 4 100lb casters and its rock solid. Also I used a piece of maple plywood nailed every 8-10in on the back works great so far.