Just to add, as long as the roofs aren't damaged they are curved enough so rain drips off.

And while steel isn't a good insulator it's not like they insulate any less than other thin materials. But yeah they are too narrow to make the ideal tiny house.

They are also way too heavy and sturdy, you don't need your tiny house to be able to be able to hold like 100 tonnes on the roof (posts) or 40 tones on the floor.