Book excerpt: 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 that you need to hire a certified engineer to do. The book covers most building types and framing systems, including door, window and roof framing. And there's a chapter on connections, retrofitting with anchor bolts, framing anchors and tie-downs, plus the latest requirements for cross-bridging and anchoring. Also included is an important chapter on designing concrete formwork -- figuring the pressures, tolerances, and thickness for plywood, Plyform, composition, and fiber-reinforced plastic. 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 "TM". 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.