R20 Wall—Insulated Headers
Typical Detail
This detail shows an R20 wall assembly with studs spaced at 24" on center, an insulated header and corner, R21 cavity insulation, WSP sheathing, and lap siding in 2D CAD format. Developed by APA – The Engineered Wood Association, this detail is drawn from APA publication IECC Compliance Options for Wood-Frame Wall Assemblies, Form P320 and reflects decades of engineered wood research, testing and field-proven best practices.
This 2D detail is designed for architects, engineers, contractors and building professionals and provides clear, code-compliant guidance.
Available in multiple formats including DWG (AutoCAD), RVT (Revit), and PDF, this detail helps building professionals streamline the design and construction process while ensuring structural integrity and proper installation of engineered wood products.
Published by APA — The Engineered Wood Association.
