This set of books has been a useful reference for many DIYs and contractors. I have looked through them and found them to be informative and easier to read than the actual code book and 100 times easier to navigate through. I've read 40 pages of the building code before and still didn't have an answer to my question. http://www.codecheck.com/ The books are perfect for an on-site reference. I have seen these or a version much like it at Lowe's. It's worth a look!