Use wall settings to extend the siding and sheathing layers down over the foundation slab.
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Walls
257 - Extend Siding Over Foundation Slab
261 - Offsetting Deck Railings
415 - Creating Wainscotting Using Railings
5 - Drawing Walls
5422 - Editing Walls
5230 - Railing Walls
5220 - Room Divider Wall Type
5312 - Interior & Exterior Wall Defaults
6122 - Foundation and Bearing Walls
2429 - Shower Wall Types
2435 - Adjusting Pony Wall Display in Plan View
368 - Creating a Dynamic Wall Legend
825 - Create Wainscoting Using Cabinets
404 - Design Wainscoting for Walls and Stairways
5317 - Multiple Wall Framing Layers
40 - Wall Coverings
5454 - Creating a New Wall Type with a New Material
5455 - Creating Pony Walls for Above Grade Brick
402 - Stepping a Foundation
Rooms, Floors & Foundations
68 - Floor Plan Basics
72 - Additional Floors & Foundation Basics
318 - Dropping a Floor and Raising the Ceiling of a Room
5434 - Setting Second Floor Defaults
41 - Custom Flooring
320 - Brick Ledge Foundations
315 - Setting Platform Depths - by Floor or by Area
5202 - Creating Floor Platforms that Hang inside Walls
54 - Creating a Porch
62 - Creating Custom Room Types
51 - Creating a Walkout Basement
11078 - Basement Design Process
321 - Crawlspace Foundation with Framed Bearing Wall
314 - Cutting a Hole in a Floor Platform
93 - Creating Basements with Furred Walls
322 - Creating a Split Level Structure
323 - Creating a Split Entry