When attaching Typar on wood-based sheathings, such as 7/16 OSB or 15/32 plywood, apply plastic-capped staples or plastic-capped nails every 32 inches (vertically and horizontally). When attaching Typar on an open stud or non-structure sheathing, apply plastic-capped staples or plastic-capped nails long enough to penetrate the stud every 32 inches (vertically and horizontally). When installing Typar over a steel frame, use screws with washers.