: Instructions for using the Big 12® to determine angles in non-square corners. Key Features Decoded in the PDF
| Advantages | Limitations | |------------|--------------| | No batteries or moving parts | Less precise than digital protractors for fine woodworking | | Doubles as saw guide | Smaller 7" size limits marking wide lumber | | Rafter scale saves time on roofs | Aluminum can wear at pivot point over decades | | Fits in tool belt | Imprinted markings can fade with heavy use | swanson speed square pdf
: The core manual detailing rafter lengths and the "One-Number Method" for standard roof construction. : Instructions for using the Big 12® to