I know that polyiso absorbs water. How do people keep it dry during construction when it is used for exterior sheathing? I’m thinking about the time between when it gets installed and when it gets covered. Also, what about Zip-R? Since it’s structural sheathing, it needs to go on when the walls go up, which might be a while before the roof goes on.

Or does it need to be kept dry? Will it dry out once it’s covered?

Thanks.