Swanson P0110 Little "Blue Book" for Roof and Stairway Layout
60 page manual
Learn how to maximize the use of your Speed Square
"One Number Method" for roof layout
Includes rafter tables & construction diagrams
This little blue book has become one of the most valuable and sought after carpenter/DIY guide books on roof and stairway layout. It has easy to follow instructions with tables and diagrams of gable, hip, valley and jack rafters. the stairway section has formulas and diagrams for proper tread to rise ratio with headroom and landing allowances. The Little "Blue Book" for Roof and Stairway Layout includes detailed instructions on how to use the Speed Square and Big 12 Speed Square using the "One Number Method" for roof layout.