Precheck construction of Ball Walls pre-approved for safety of structural design and fire and life safety, for use on school grounds, by the state of California- Department of General Services- Division of the state architect under it's own PC number, in conjunction with Title 24, California code of regulations. Sets of signed prints and building specifications are on file with the division of the state architect at their area offices in Los Angeles, Sacramento, San Diego & Oakland, California. Support Posts- 4" square steel-tube, 3/8" wall thickness, extends 4' into 6' concrete footings. Internal Frame- Horizontal steel studs 2" x 4" "C" channel, spaced 16" horizontally. Weatherproof Panel Sheets- 1/2" Exterior Grade plywood is permanently bonded with overlay of phenol-type resin impregnated fiber. This superior plywood forms a smooth playing surface on both sides of the wall. Frame Capped- with galvanized sheet metal, sides and top, preventing moisture from penetrating wood. Assembly- All parts are factory pre-cut. Installation instructions included to simplify assembly. Steel reinforcements for footings not included. Painting not included. It is recommended that the owner apply one primer coat and two coats of outdoor enamel after the ball wall is installed. An appropriate fee is charged for calculations to be submitted to a regulatory agency for approval. Custom sizes available in 8' or 12' high by 8' multiple lengths. Powder coat option avaiable on posts.