Large Opening Single Headers
Typical Detail
This detail shows the use of a single header, such as a 3-1/8" or 3-1/2" glulam, multiple-ply SCL, or dimensional lumber, with a width less than the wall to create more space for insulation in 2D CAD format. Developed by APA – The Engineered Wood Association, this detail is drawn from APA publication Advanced Framing Construction Guide, Form M400 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.
