The beam and lumber requirements for your jobs aren't always clear, especially with changing building codes and lumber products. If you need to figure any type of on-the-job lumber engineering, this book will help fill the gap between what you can find in building code span tables and the complex calculations explained in simplified language, the author shows you: how to figure the stresses for engineered wood structural members, plywood beams and panels, glu-lam products, and trusses; how to calculate loads, including snow, seismic and impact loads; how to design girders, beams and joists. This book covers most building types and framing systems, including door, window and roof framing. SOFTWARE INCLUDED: In the back of the book you'll find a computer disk with an easy-to-use version of NorthBridge Software's Wood Beam Sizing. Just follow the step by step instructions in the program to find out what size member you need for the spans and loads that you require based on the wood species that you're using. Requires Windows 3.1 or higher.