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You can specify the thickness and framing materials used to construct floor and ceiling platforms on a floor-by-floor basis in the Framing Defaults dialog.
Rooms, Floors & Foundations
5202 - Creating Floor Platforms that Hang inside Walls
68 - Floor Plan Basics
72 - Additional Floors & Foundation Basics
62 - Creating Custom Room Types
41 - Custom Flooring
314 - Cutting a Hole in a Floor Platform
318 - Dropping a Floor and Raising the Ceiling of a Room
5234 - Material Region Tools
315 - Setting Platform Depths - by Floor or by Area
6122 - Foundation and Bearing Walls
320 - Brick Ledge Foundations
51 - Creating a Walkout Basement
402 - Stepped Foundation
93 - Creating Basements with Furred Walls
321 - Crawlspace Foundation with Framed Interior Bearing Wall
322 - Creating a Split Level Structure
323 - Creating a Split Entry
9917 - Focus - Creating a Split Level Home