UL Class 90 (NM520)
Typical Detail
This detail shows a wind-resistive roof assembly with hot-mopped built-up roofing over APA-rated plywood sheathing and structural framing, rated U.L. Class 90 in 2D CAD format. Developed by APA – The Engineered Wood Association, this detail is drawn from APA publication Wind-Rated Roofs: Designing Commercial Roofs to Withstand Wind Uplift Forces, Form G310 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.
