I've had rats before (7 over two groups) and am hoping to get some more in the future. I'm planning things in advance now I am older and wiser re rats and my aim is for floor time to open the cage and let them roam the attic room where they will live. Ideally I need to be able to cordon off an area, partly as the attic is large and partly as there are parts I don't want them going to (my consoles for example).
Does anyone have any tips as to how I could make temporary walls? I know from experience rats can easily get over 2 foot walls, presumably there is a height that would be too much for them, is there a hard and fast rule (if I do it right, I can always add height I suppose

All floor time would be supervised, so it doesn't have to be foolproof, but I'd rather not have to chase rats behind desks!

I think every other potential hazard (getting under or into things) I can manage.
My only other 'issue' that is putting me off is I remember when my second to last rat died and I had to rehome the last one

Thanks all