Intended for masonry cavity wall installations with stucco, stone, and brick veneers, Mortairvent RFI consists of a non-woven, mortar deflection fabric adhered to rigid 16-inch foam insulation panels. The product is fitted between the brick ties in full cavity wall applications, allowing the space to breathe and stay dry. It comes in several thicknesses. Cost: $2 to $4 per square foot. Advanced Building Products. 800-252-2306. www.mortairvent.com.