1/2 Inch ground protection boards st uae-HDPE black panel Dimensions: 1/2 in. x 4 ft. x 8 ft. Application: Exterior above grade walls, underneath vinyl siding / claddings; Closed cell rigid foam board, designed to resist moisture and helps to block mildew; Has a higher R-value than wood fiber, plywood or 1/2 in. gypsum board products; Click here