What kind of R value does the PlexiDor have? The PlexiDor has not been rated with an R value. However, the door was designed for extreme climates. PlexiDors offer excellent protection against weather and the doors are popular in Canada, Alaska, and Switzerland because of the good insulation and excellent weather seal. The panels are double paned, like a double pane window. This creates an insulating layer of air inside the panel and gives great energy efficiency. The panels are lined with high-quality weather seal, so you won’t get a draft through the door.