With building codes and regulations including disabled children, adding deck railings is a good idea, and can even be mandated by law. You can build deck railings fir, redwood even composite newest and add value to your deck as well as safety. Sort through the 2-for-4s and select the most suitable for the handrail and the second best support. Trim both ends of the deck railings of the square, then measure and cut the base 2-for-4 in that length. Cut four 2-by-4s at 32 inches each. Place the rail and parallel to each other based placement edge 32 inches apart. Placing the support legs 32 inches at both ends inside the base of the rail and wash outer edge.
Measure each side about 32 inches from the center. Check the handrail and the base, and slept in the stands 32 inches. Adjust to fit. Square to the frame and bolted to the rail and base. Measure between the supports, then cut three stretchers to fit approximately 29 3/4 inches. Inserted into the rail between the supports. With the stretcher become upright to the handrail, centered underneath and centered between the supports, screw through the media on both sides and down through the top of the handrail.