Tyler LeClear Vachta

A finished basement is a great use of space — as long as it’s bone dry. The Control Cavity interior drainage plane for basement walls is designed to work the way an exterior rain screen does: It keeps wall assemblies dry by channeling intrusive moisture to a perimeter drain. According to the manufacturer, the corrugated material is made from 100 percent recycled high-impact polystyrene and is easily trimmed with a utility knife. It’s sold in 35-pound rolls that are 50 feet long and 31 1/2 inches wide and costs about 80 cents per square foot. Masonry Technology, 800/879-3348, mtidry.com

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