My house has two decks on top of each other but I’ve really wanted to be able to protect the lower one in some way when it rains. It seems like a reasonable idea. But I’ve recently learned that trying to fill the gaps of the deck above is a really bad idea for a number of reasons.
https://www.reddit.com/r/Decks/comments/15gidgl/is_there_a_nonstupid_way_to_shield_my_lower_deck/