Book excerpt: Leakage problems in construction are the number one cause of lawsuits. That's why you need Kubals new Waterproofing the Building Envelope--the first book designed to cover every facet of waterproofing, from below-grade to above-grade and back down again. It's the only book that explains the critical 90%/1% principle--why 90% of all building leakage is attributable to 1% of a building's area and what you can do about it. It shows you how to select the right materials and systems for a particular project--including sealants, expansion joints, and admixtures--and put them all together so that they function as a waterproof envelope. Included are tips on testing, cleaning, maintenance, and repair--plus coverage of safety and environmental standards.