41+ Building A Shed Under A Deck Images. We added 4×4 posts underneath the deck, back far enough to give space to the boards. The following youtube video covers some important factors to consider when building such a deck.
If you are tying the roof directly to a house wall, you can install a ledger board with flashing and install rafter ties to attach the rafters at the appropriate angles.
If you're unsure about the state of your deck, call in a qualified building inspector to give you an expert assessment. You might find this video. I recently converted the 3d deck & shed plans into sketchup so that others can benefit. The following youtube video covers some important factors to consider when building such a deck.