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Check Roof Over This Room on the Structure tab of the Deck room's Specification dialog to have a roof automatically generate over the room.
Decks
55 - Decks
1509 - Adding a Deck with a Roof and Ceiling
500 - Automatic Deck Framing
54 - Patios
10097 - Wrap Around Stairs
504 - Manual Deck Framing
342 - Placing Deck Posts and Footings on a Module over a Terrain
5315 - Post & Footing Tools and Deck Support Controls
5464 - Adding a Deck
10098 - Deck Inlay