The manufacturer says this new nylon roof sheathing clip is a dramatic improvement over steel versions because it is faster and easier to install. In fact, the company says, it should save about 1.5 man-hours on a 2,200-square-foot home. The unit has “living hinges” that move to lie flat and grip the sheathing. It leaves consistent 1/8-inch expansion gaps between sheets and can be used on 7/16- to ½-inch-thick boards. Cost: 9 to 11 cents per clip. . 608-712-2353.