Sometimes at construction sites when it rains, you can see a wooden roof exposed without any felt and tiles. Or rain pours down into insulation that isn't covered. Personally, I think it seems wrong not to cover properly all the time and build with the wet stuff, but I don't know; I'm not knowledgeable in the area.
How is it really, is/does it become a problem not to have a construction properly covered, or do these kinds of "rainsoaked" conditions fix themselves (wood/insulation dries out) and it doesn't matter to build with that? I can understand that it would be a huge job to constantly cover/uncover to avoid such wetness. Maybe it's completely unfeasible?