Fortifiber’s L7 Flashing should make it easier to flash electrical boxes and other penetrations. Made from a butyl adhesive and a coated woven facing, it’s precut in an L-shape with 9-inch-long and 3-inch-wide legs. It’s formulated to work with the manufacturer’s Moistop Sealant and can be applied in temperatures down to 25°F. Cost is about $65 for a bag of 50 pieces. Fortifiber, 800.773.4777,

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