Underhill's living room roof, which covers about 500 square feet, is about to be waterproofed. The materials are on hand, the surface has been thorougly cleaned, and every joint has been caulked. This weekend, the waterproofing will be applied. It consists of a liquid-applied primer, a thick coating of liquid-applied urethane waterproofing, a layer of reinforcing fabric pressed into this coating while it's still wet, and a second coating of waterproofing on top of that. Once that cures (in a day or two), we'll cover it with foamboard insulation, root-stop, a drainage medium (crushed stone), filter fabric, soil - and finally the vegetation native to Underhill's beautiful woodland site.