What is this material called?

[Robert Francis]

Boy are things a little different down there, I would have concerns about the exposed nails and the end seam as in the picture, Up here in igloo country the nails would not last that long and water and ice would seep into that end seam easily. I am not trying to be rude so excuse me if this is the proper way to do it and enlighten my knowledge.

[Rob A. Parker]

Seen this same crap about 6 weeks back on a cottage at Port Burwell only about 5 years old and it was done.Advised client to replace it as soon as possible.Nails loose,ends damaged and finish blistered.