Exterior covering

Applying plastic exterior:

Warm the plastic before stretching over wall and roof panels. Cooler temperatures contract the plastic and warm temperatures relax plastic. How the plastic looks on the frames will change based on the temperature.

Applying plastic
Once the plastic has been stretched and stapled over wall panels you can add the trim strips and ranch board / plywood panels to the bottom of the wall panels.
Applying exterior trim
The addition of the trim strips keeps the plastic tight on the wall panels. It also allows damage like puncture to plastic to be easily repaired as section damaged can be cut out and replaced versus replacing full wall panel plastic.