WeatherSmart Drainable is a scientifically-advanced weather-resistive barrier incorporating patented technology that delivers exceptional drainage performance. The product takes it to the next level by adding patented technology that channels liquid away from the wall assembly with greater than 95 percent efficiency. With a perm rating of 15, the WRB design provides architects and builders with the ideal level of vapor permeability. Protected by a 10-year limited warranty, it is available in 5-, 9- and 10-foot wide rolls by 125 lineal feet. For information, visit fortifiber.com.