I live high up in the Rockies where winter winds blow 60 mph. It goes without saying that wrapping my pens with plastic is a winter necessity. However, the very first wind after I put on the big sheets of plastic, took a weak corner, and next thing I knew, my pen looked like a sailing galleon.
I figured out that building smaller, light-weight wood frames and stapling the plastic to those was a far better way to go. The panels are about four feet wide and as tall as the pen fence. I secure them to the fence with wire. I face the stapled side of the plastic toward the fence so that the wind can't get under the plastic and work it loose.
Mounting the plastic on smaller frames also allows you to take them down easily, one or two perhaps on the south sides, for ventilation on unseasonably warm winter days, and they go back up quickly when the weather changes.
I figured out that building smaller, light-weight wood frames and stapling the plastic to those was a far better way to go. The panels are about four feet wide and as tall as the pen fence. I secure them to the fence with wire. I face the stapled side of the plastic toward the fence so that the wind can't get under the plastic and work it loose.
Mounting the plastic on smaller frames also allows you to take them down easily, one or two perhaps on the south sides, for ventilation on unseasonably warm winter days, and they go back up quickly when the weather changes.