I have 2 pieces of 4x9 ft thick insulation. I duct taped the two together like a hinge so I could have it folded up and save space til I need the whole thing. A friend helped me and we sprayed with an office type spray on the insulation then gently rolled on the batting.
It doesn't roll ... but I sewed a bit of clear table cloth to fit as a bottom protector and now slide it around the studio as needed. If I need more space I take off the vinyl bottom and open it up, place my blocks, take a picture, label my blocks and rows, then fold it back up. Most of the time I just use the 4x4 ft size anyway. It covers a little alcove I have made especially for my serger and quilting books.