John from 'To the Garage' reduces drafts and dirt getting past his roller shutter Garage door to keep Purdey the Jaguar XK8 clean and warm over the winter.

If you try something similar then make sure you put the soft side of the carpet against the door outer surface of the door to avoid scratching.
Don't go right to the edges of the roller, leave about 2 inches to stop any fibres eventually working loose and being drawn into the mechanism
And if you make your strip too narrow it will want to climb over to the outside when you close the door.