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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.
14 - Decks
54 - Patios
55 - Decks
342 - Placing Deck Posts and Footings on a Module over a Terrain
369 - Creating Matching Textures for Deck Planking, Rim, Rail and Stairs
1509 - Adding a Deck with a Roof and Ceiling
5315 - Post & Footing Tools and Deck Support Controls
5464 - Adding a Deck
500 - Automatic Deck Framing
504 - Manual Deck Framing