Building Construction features added in X13 include standard, reduced stud, and laddered wall intersections, more control over header placement, horizontal wall and roof framing.
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Features Introduced in X13
5513 - What's New in X13 - Full List
5514 - What's New in X13 - Building Construction
5515 - What's New in X13 - Design
5516 - What's New in X13 - Drafting & Project Management
5517 - What's New in X13 - Presentation
5518 - What's New in X13 - Productivity