Take the indoors out and expand living space with InsideOut's patented panels. InsideOut creates a finished look to the underside of the deck. No more visual clutter from exposed nails and dirty deck boards overhead. InsideOut Underdecking channels the water away from the home, keeping the area below the deck dry and enjoyable for outdoor living. The specially designed panels and deep water brackets have been tested and approved to handle over 15" of water an hour.